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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">A related elephant in the room: of the actual installed heating capacity (i.e. “what’s drawn”), only a fraction of that heat will find its way into the conditioned space. That figure is what you’ll want to use for the baseboard heating capacity, if you do decide to go that route.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">Some years back, the same topic of “active heating” windows came up with a robust discussion thread. I’ve pasted what’s in my archive below for reference. I’m not sure we came to any conclusive “best practice” suggestions, but the discussion should prove helpful in determining your own path forward!</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">You might want to consider foregoing the idea of any of this heat will substantially contribute to the interior conditions. Put another way, you may assume most heat will migrate to the colder side of the glass, that is the exterior. Running with that and in lieu of using baseboards, you could perhaps more simply set up this energy as a direct process or meter load with an on/off/temp schedule.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">~Nick</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><div><p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#002060">NICK CATON, P.E.</span></b><span style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#1f497d"><br></span><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782">Owner</span></b></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782"> </span></b></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#561782">Caton Energy Consulting</span></b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><br></span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> 306 N Ferrel</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Olathe, KS 66061</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> office: 785.410.3317</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#561782"><a href="www.catonenergy.com"><span style="color:#561782">www.catonenergy.com</span></a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b><a href="mailto:bfountain@greensim.com">bfountain@greensim.com</a><br><b>Sent:</b> Wednesday, July 29, 2015 11:38 AM<br><b>To:</b> 'Hari Jammulamadaka'; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Modelling Heated Windows in eQuest</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Baseboards are the only way I can think of to do it. The caution I have is that DOE-2 uses baseboard heating first before any other heating to satisfy zone heating requirements (including OA!). So, you would need to make sure the window-baseboard heater capacity (which is not auto-sized) is relatively small.</span></p><p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>John Aulbach<br><b>Sent:</b> July-29-15 11:12 AM<br><b>To:</b> Hari Jammulamadaka; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Modelling Heated Windows in eQuest</span></p></div></div><p class="MsoNormal"><span lang="EN-CA"> </span></p><div><div id="yui_3_16_0_1_1438182216963_7314"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">Hari:</span></p></div><div id="yui_3_16_0_1_1438182216963_7313"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><div id="yui_3_16_0_1_1438182216963_7312"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">Could you possibly use Baseboard heating to simulate the heated windows? Baseboards are usually under windows anyway to mitigate transmission loads. Not sure how you measure the kBtu/kW of your windows, but you can translate into the same heating capacity.</span></p></div><div id="yui_3_16_0_1_1438182216963_7312"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><div id="yui_3_16_0_1_1438182216963_7312"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">See if the offered eQuest controls for Baseboard satisfy your requirements on the windows.</span></p></div><div id="yui_3_16_0_1_1438182216963_7312"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><h5 style="background:white" id="yui_3_16_0_1_1438182216963_8763"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">BASEBOARD</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">-CTRL</span></h5><div id="yui_3_16_0_1_1438182216963_8767"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">Takes a code-word that specifies the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">control</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> method for </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboard</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> heating in the zone. Defines the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">control</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> method as THERMOSTATIC using HEAT-TEMP-SCH as the setpoints, or OUTDOOR-RESET to allow </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">BASEBOARD</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">-SCH reset </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">control</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">. This is a zone-level keyword for PLENUM-type zones; it allows "</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboards</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">" to be placed in plenums and allows the simulation of outside or space temperature </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">controlled</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> heaters in the return air space. The plenum heater is activated based on outside air temperature and reset schedule when it is outside </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">controlled</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">. When it is space temperature </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">controlled</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">, and if the interaction with the return air does not result in a temperature above the scheduled value, the heater is turned on. In either case, the source of energy input to the heater is defined by the specified or defaulted value for </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">BASEBOARD</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">-SOURCE. See also </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">BASEBOARD</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">-CTRL, THROTTLING-RANGE and </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">BASEBOARD</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">-RATING. Input for this keyword is the code-word that specifies the method used for </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">controlling</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> the output of the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboard</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> heating element in the zone.</span></p></div><div id="yui_3_16_0_1_1438182216963_8767"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><div id="yui_3_16_0_1_1438182216963_8797"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">THERMOSTATIC </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">Baseboard</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> heating is </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">controlled</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> by a thermostat located in the zone. The program assumes that the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboards</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> add heat as required, up to their maximum capacity, to maintain zone air temperature within the heating throttling range.If there is a heating load the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboards</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> are sequenced on first. If the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboards</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> cannot meet the entire heating load, heating from the zone's air system, if available, will then be activated.</span></p></div><div id="yui_3_16_0_1_1438182216963_8797"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><div id="yui_3_16_0_1_1438182216963_8809"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">OUTDOOR-RESET </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">Baseboard</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> heating is </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">controlled</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> by a thermostat located outside the building. In this case the program assumes that the </span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">baseboard</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> heating output increases linearly as the outside air temperature decreases. The linear function and the operating period are defined by SYSTEM:</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:white;background:#3399ff">BASEBOARD</span><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">-SCH.</span></p></div><div id="yui_3_16_0_1_1438182216963_8809"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><div id="yui_3_16_0_1_1438182216963_8809"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">John R. Aulbach, PE</span></p></div><div id="yui_3_16_0_1_1438182216963_8809"><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black">Los Angeles Ca</span></p></div><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p><div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-family:"Verdana",sans-serif;color:black"> </span></p></div><div><div><div><div><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">On Wednesday, July 29, 2015 6:49 AM, Hari Jammulamadaka <<a href="mailto:hari.swarup@gmail.com">hari.swarup@gmail.com</a>> wrote:</span><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black"></span></p></div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black"> </span></p><div><div id="yiv5621912509"><div><div><div><div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black">Hello,</span></p></div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black">I am trying to model a building with heated windows (windows with heating elements). The windows are not meant for comfort heating of the building. Just localized heating for improving the comfort conditions in the building. I have looked all over and couldn't find a way to model them. Can someone suggest how I could go about this in eQuest?</span></p></div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black">Thank you.</span></p></div><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black">Sincerely,<br clear="all"></span></p><div><div><div><div><div><div><div><p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black">Hari<br><br><br>"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." --Mark Twain</span></p></div></div></div></div></div></div></div></div></div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-family:"Helvetica",sans-serif;color:black"><br>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a></span></p><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><div style="border:none;border-bottom:dotted windowtext 3.0pt;padding:0in 0in 1.0pt 0in;background:white"><p class="MsoNormal" style="margin-bottom:12.0pt;background:white;border:none;padding:0in"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p></div><p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Bruce Easterbrook [mailto:<a href="mailto:bruce5@bellnet.ca">bruce5@bellnet.ca</a>] <br><b>Sent:</b> Thursday, August 12, 2010 7:59 PM<br><b>To:</b> Nick Caton<br><b>Cc:</b> Namrata Vora; Sami, Vikram; Sam Mason; Bishop, Bill; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> Nick you understand perfectly and Bill is the one you should be listening to. This is what happens when marketing gets hold of something without talking to engineering. It is all BS. I looked at both sites, basically they are taking a low E thermopane and adding a third pane of their heating glass. A real good 2 pane IGU will be about R-4.2, add another pane and you could be in the R-7 range or a U value of .14, all centre of glass. There is no way 2 pieces of glass in this 3 pane unit are the same temperature. If the middle piece is almost the same temperature as the warm inside piece that actually proves you have a huge amount of heat moving to outside not to the inside. There will also be radiation, and in this instance it will be significant as well. The reflective properties of the low E glass will help, reflecting a certain percentage back into the room as the glass should be throwing long wavelength radiation but a significant portion will still flow through unless the low E coat is thick enough, ie a mirror, which doesn't do much for looking outside. Like you said earlier you have a radiator with a 70F room one side and a winter night at -13F on the other side, it is not rocket science to know in which direction most of the heat will flow.<br> Getting to the modelling using baseboards I don't think you can. A baseboard is going to have a R-20 opaque surface behind it and the heated glass is going to have a R-4 transparent surface behind it.<br> As far as I see it the only real benefit of this glass is you will be able to run your humidity higher in the winter without having condensation on the edges of the glass but at what I would estimate to be a significant energy penalty. You would get most of these benefits just by having the triple low E IGU with low conductivity spacers or by having curtains. You will not heat a room with it and be able to pay the hydro bill. Note all the conformances are for glass. I don't see any insulating window certifications. Until these are tested no jurisdiction in NA will allow you to use them with the numbers they are quoting. <br>Bruce Easterbrook P.Eng.<br>Abode Engineering<br><br><br>On 12/08/2010 06:50 PM, Nick Caton wrote: </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Namrata,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I have patched Bill Bishop’s latest response in below in case you missed it. He’s a proven smart cookie, and if he’s telling me I’ve got my head wrapped around the problem the wrong way then I do believe him… </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">…but with that caveat, the manufacturer implying zero heat transfer through the entire window assembly (because two of at least 4 surfaces have equal temperature), sounds like flat-out misinformation to me. If two surfaces of a material have equal temperature (say, 100 °F), then yeah, the conduction between them would be zero, but that won’t prevent convection/radiation from sweeping a majority of heat away when one side is subject to sub-freezing temperatures! My car for example has a heated rear window which helps me dislodge nightly glacier-formations in the wintertime. On a cold day, the heat generated in that glass may help heat the interior air somewhat, but surely a majority is going straight to the literally frozen exterior, especially once the interior air has risen to a temperature in which I can breathe regularly. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I remain skeptical of the concept of using heated windows as a good idea for a space heating source (as opposed to a draft or condensation mitigation strategy – perhaps to melt snow in a skylight as well?). Still, if these units do put a significant fraction of heat into the space, I think modeling electric baseboard heating will at the least be a good start to emulate the space temperature behavior the actual system may help achieve – though I’m still stuck wondering how you might account for the amount of energy that is lost to the exterior as the units operate… hear me out as I think my ducks are in a row here =)!</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I’d be cautious that your manufacturer may be, intentionally or not, dumbing down the discussion by framing their “effective U-value” as a material property like “conductivity.” Conductivity is an arbitrary material property that does not change with temperature – (i.e. steel has a higher conductivity than air). U-values (and R-values) on the other hand have that tricky little °F (or °C) in their units, because they are tied directly to a heat transfer rate, which requires having a delta-T – in other words, for a given set of material properties, the rate of heat transfer is dependent on the difference in temperature the assembly is subject to. That’s one reason we come across “summer” and “winter” U-values for window assemblies. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">It’s my intuition that eQuest (among other variables) uses the hourly exterior temperature from the weather file alongside the hourly calculated interior temperature for the parent zone to determine what temperature difference to use when figuring the hourly heat loss through a window assembly. A heated window however (when on) should be using a fundamentally different figure for the interior surface temperature than, say, 70°F when determining a temperature difference to find the hourly heat loss for the zone. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I think I’m understanding now what we’re all getting at when we speak of “effective U-values:” If a baseboard heating element in eQuest (or other software) uniformly distributes 100% of its heat to the zone, then we might account for the reality of a significant (?) fraction being lost straight out the window by increasing the window’s effective U-value, in turn modeling a realistically higher heat loss through the assembly on account of the higher-than-normal heat temperature difference between the innermost and outermost surfaces of the window, right? </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I could certainly be wrong, but an approach defining an electric internal equipment load with an custom equipment power curve (see Bill, below) *<b>might</b>* be easier than an approach defining dynamic window properties (which I do not think is feasible in eQuest). </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Again, I am not writing with full confidence that I completely understand exactly how heated windows truly function, but critically thinking this through is helping me get there! I look forward to anyone stepping up to the plate to affirm or refute my current understanding =).</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Nick</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><img border="0" width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01D0CA23.06A09E00" alt="cid:489575314@22072009-0ABB"></span></p><p class="MsoNormal"><b><span style="font-size:11.0pt"> </span></b></p><p class="MsoNormal"><b><span style="font-size:11.0pt">NICK CATON, E.I.T.</span></b></p><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri",sans-serif;color:#cc9900">PROJECT ENGINEER</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">25501 west valley parkway</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">olathe ks 66061</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">direct 913 344.0036</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">fax 913 345.0617</span></p><p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">Check out our new web-site @ </span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:blue"> </span></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Namrata Vora [<a href="mailto:namrata.vora@soladigm.com">mailto:namrata.vora@soladigm.com</a>] <br><b>Sent:</b> Thursday, August 12, 2010 2:08 PM<br><b>To:</b> Nick Caton; Sami, Vikram; Sam Mason; Bishop, Bill; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> active heating window modeling</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">All,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks for your prompt responses</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The mfg of this technology claim that since the temp difference b/n surface 3 & 4 is zero or minimal, there is no heat transfer out through the windows. In addition the radiant nature of the heat allows the room temperature to be set lower.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This particular company claims a u-value of 0.14 in non-heated state. I tried creating such a low u-value dual pane IGU using WINDOW5 and was unable to get that. So I created it directly in eQuest using simplified glass type method. Now will try adding the radiant heating as electric baseboard as suggested.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="http://www.iqglass.com/products_iqglass/products_specs.html">http://www.iqglass.com/products_iqglass/products_specs.html</a></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I agree w/ Nick’s comment. In addition I wouldn’t think the window would be in heating mode all the time. I would need to figure out when to trigger the heating.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Namrata </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Cell: 408-893-3729</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Bishop, Bill [<a href="mailto:wbishop@pathfinder-ea.com">mailto:wbishop@pathfinder-ea.com</a>] <br><b>Sent:</b> Tuesday, August 10, 2010 1:36 PM<br><b>To:</b> Nick Caton; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> RE: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Nick,</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">“The “efficiency” of these units … is going to vary hourly (probably dramatically) based on the outside-to-interior temperature difference.” <i>Don’t think of it as less heat to the space, but more heat to the exterior. The window U-factor should take care of this.</i></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">“apply an ON/OFF/TEMP schedule to an equipment or internal energy load?” <i>You can apply an equipment power curve as a function of space temperature (EQUIP-PWR-FT).</i></span></p><p class="MsoNormal"><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">“</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I’m concerned I might be missing something” <i>For the same glazing properties, the heat loss to the exterior should be the same, EXCEPT that the interior surface is now warmer, so radiative and convective losses should be higher. Hopefully the manufacturers account for that in their rated U-factor. I’m not convinced yet that there is any energy benefit to this system.</i></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Regards,</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Bill</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> </span></p><div class="MsoNormal" align="center" style="text-align:center"><hr size="2" width="100%" align="center"></div><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Nick Caton [<a href="mailto:ncaton@smithboucher.com">mailto:ncaton@smithboucher.com</a>] <br><b>Sent:</b> Tuesday, August 10, 2010 12:15 PM<br><b>To:</b> Sami, Vikram; Sam Mason; Bishop, Bill; Namrata Vora; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> RE: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">On further thought, I think the equipment referenced would be over-simplified if you just modeled an electric baseboard (that was my intuitive reaction also – a few beat me to the punch)…</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The “efficiency” of these units, meaning the btu/h delivered to the space for every input kW, is going to vary hourly (probably dramatically) based on the outside-to-interior temperature difference. If it’s -10F outside and 70F inside, these are going to lose a ton of the input heat to the exterior for the amount desired heat flowing inside – heat will flow proportionately to where it’s coldest.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Time allowing, I’d propose achieving a much higher degree of modeled accuracy by defining a series of equipment loads, each with <u>a custom multiplier schedule</u> (even if the units in reality are under some kind of thermostatic control) to account for when the units would be turned on. This would be more work, but then you’re able to define a distinct sensible HG ratio to account for the fraction of heat actually entering the space (instead of lost to the exterior). As you can define up to 5 separate equipment load/schedule combinations for one space, you could come up with a weighted efficiency to apply to the SHG ratio for up to 5 different blocks of time. Further explanation: This would involve creating hourly reports to compare the hourly exterior temps to the target heating temp for the interior, for the times the units would be operating, and to use that info to figure out an hourly efficiency for the system based on how much heat would actually find it’s way into the interior zone. Those hourly results could be used to come up with weighted SHG ratio values for 5 blocks of time.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">On a related note, I’ve got a question for everyone: Does anyone know of any workaround (aside from extensive excel number-crunching) to apply an ON/OFF/TEMP schedule to an equipment or internal energy load?</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">On another tangent, for my own education, am I wrong to consider heated glass as an intrinsically <u>inefficient</u> approach to space heating? It seems most appropriately applied as a “band-aid” or “patch” solution to a decision to put too much glazing where drafts will cause discomfort. One of the previous links has a claim: “</span>When installed as part of a zone heating strategy, heated windows can actually reduce the overall energy consumption of a building by decreasing dependence on an inefficient HVAC system.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">” Wouldn’t this need to be a <u>terribly</u> inefficient heating system to compare unfavorably to a heating element losing >50% of its energy to the exterior? I’m concerned I might be missing something fundamental for HVAC design here… =/</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Nick</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><img border="0" width="119" height="37" id="Picture_x005f_x0020_1" src="cid:image001.jpg@01D0CA23.06A09E00" alt="cid:489575314@22072009-0ABB"></span></p><p class="MsoNormal"><b><span style="font-size:11.0pt"> </span></b></p><p class="MsoNormal"><b><span style="font-size:11.0pt">NICK CATON, E.I.T.</span></b></p><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri",sans-serif;color:#cc9900">PROJECT ENGINEER</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">25501 west valley parkway</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">olathe ks 66061</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">direct 913 344.0036</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">fax 913 345.0617</span></p><p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#2d4d5e">Check out our new web-site @ </span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:blue"> </span></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Sami, Vikram<br><b>Sent:</b> Tuesday, August 10, 2010 11:07 AM<br><b>To:</b> Sam Mason; Bishop, Bill; Namrata Vora; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I stand corrected – it is a good U-Value </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1f497d">J</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">Vikram Sami</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">, LEED AP</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">Sustainable Design Analyst</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">1382 Peachtree St. NE, Atlanta, GA 30309</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">t: 404-443-7462 f: </span><span lang="ES" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">404.892.5823 </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray"> e: <a href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="http://www.perkinswill.com/"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray;text-decoration:none">www.perkinswill.com</span></a></span></p><p class="MsoNormal" style="margin-bottom:3.0pt"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">Perkins+Will.</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Ideas + buildings that honor the broader goals of society</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Sam Mason [<a href="mailto:sam.mason@atelierten.com">mailto:sam.mason@atelierten.com</a>] <br><b>Sent:</b> Tuesday, August 10, 2010 12:00 PM<br><b>To:</b> Sami, Vikram; Bishop, Bill; Namrata Vora; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> RE: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Vikram,</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">The conversion from W/sq.m.-K to Btu/hr-sq.ft.-F is 5.68. This gives a U-value of 0.162 Btu/hr-sq.ft.-F.</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I would like to see a study of the energy consumption of this window compared to a building with normal low-e IGU and actual radiators. </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Sam</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">--</span></p><p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Sam Mason</span></p><p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Atelier Ten</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Sami, Vikram<br><b>Sent:</b> Tuesday, August 10, 2010 11:47 AM<br><b>To:</b> Bishop, Bill; Namrata Vora; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I’m a little curious – is 0.92 W/m2k a good U-value? Just poking around on online converters – it looks like the IP version of that is around 0.56 or something in that region – doesn’t seem spectacular (you get 0.25 with a lot of double pane low-e IGUs). Unless the 0.922 is for the entire glazing assembly – in which case its around the same as other glass types. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I might have got the conversion factor wrong. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">Vikram Sami</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">, LEED AP</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">Sustainable Design Analyst</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">1382 Peachtree St. NE, Atlanta, GA 30309</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">t: 404-443-7462 f: </span><span lang="ES" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">404.892.5823 </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray"> e: <a href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="http://www.perkinswill.com/"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray;text-decoration:none">www.perkinswill.com</span></a></span></p><p class="MsoNormal" style="margin-bottom:3.0pt"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray">Perkins+Will.</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Ideas + buildings that honor the broader goals of society</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Bishop, Bill<br><b>Sent:</b> Tuesday, August 10, 2010 11:25 AM<br><b>To:</b> Namrata Vora; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Namrata,</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">I would model the heating as electric baseboards and select a glazing type based on the U-value and SHGC.</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Regards,</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Bill</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt">William Bishop, PE, BEMP, LEED<sup>®</sup> AP | Pathfinder Engineers & Architects LLP</span></b></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Mechanical Engineer</span></p><p class="MsoNormal"><span style="font-size:5.0pt;font-family:"Arial",sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:navy">134 South Fitzhugh Street</span><span style="font-size:9.0pt;color:navy"><br></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:navy">Rochester, NY 14608</span><span style="font-size:9.0pt;color:navy"><br></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:navy">T: (585) 325-6004 </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Ext. 114</span><span style="font-size:9.0pt;color:navy"><br></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:navy">F: (585) 325-6005</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><a href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a></span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><a href="http://www.pathfinder-ea.com">www.pathfinder-ea.com</a></span></p><p class="MsoNormal"><span style="font-size:18.0pt;font-family:Webdings;color:green">P</span><span style="color:green"> </span><span style="font-size:7.5pt;color:green">Sustainability – less is more.</span></p><div class="MsoNormal" align="center" style="text-align:center"><hr size="2" width="100%" align="center"></div><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Namrata Vora<br><b>Sent:</b> Tuesday, August 10, 2010 10:34 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] (no subject)</span></p><p class="MsoNormal"> </p><p class="MsoNormal" style="margin-bottom:12.0pt"><span class="apple-style-span">How does one model active heating windows like the ones listed below.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><a href="http://www.iqglass.co.uk/p/h/Products/U_Values_%26_Benefits/218/">http://www.iqglass.co.uk/p/h/Products/U_Values_%26_Benefits/218/</a></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><a href="http://www.thermiquetech.com/about_heated_glass.html">http://www.thermiquetech.com/about_heated_glass.html</a></span></p><p class="MsoNormal"><span class="apple-style-span"> </span></p><p class="MsoNormal">Namrata Vora</p><p class="MsoNormal">408-893-3729</p><p class="MsoNormal"><br><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:gray">This email and any files transmitted with it are confidential and intended solely for the addressee. 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