<p>I've modeled that film for an office building in wellington, nz. I was pretty excited but unable to show overall building energy reduction sure to the film. Need to run a one zone model and see if I can obtain savings in particular conditions. </p>
<p>That said a 40% better u value is wild. If be excited about 5% over the year.</p>
<p>Jason<br>
</p>
<p>On Jan 16, 2013 10:01 AM, <<a href="mailto:bldg-sim-request@lists.onebuilding.org">bldg-sim-request@lists.onebuilding.org</a>> wrote:<br><br>Send Bldg-sim mailing list submissions to<br>
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<br>Today's Topics:<br>
<br>
1. HELP WANTED Senior and Intermediate Building Analysts<br>
(Vancouver, BC) (Cobalt Resumes)<br>
2. Re: Internal mass modeling guidance in E+? (Doug Hittle)<br>
3. Re: Internal mass modeling guidance in E+? (Justin Spencer)<br>
4. HELP WANTED: Lawrence Berkeley National Laboratory (Philip Haves)<br>
5. Re: Internal mass modeling guidance in E+? (Joe Huang)<br>
6. Re: Internal mass modeling guidance in E+? (Chris Yates)<br>
7. Technical Staff position at Atelier Ten, San Francisco<br>
(Shruti Kasarekar)<br>
8. Window Film Product Claims (John Aulbach)<br>
<br><br>---------- Forwarded message ----------<br>From: Cobalt Resumes <<a href="mailto:resumes@integral-group.ca">resumes@integral-group.ca</a>><br>To: "<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>" <<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>><br>
Cc: <br>Date: Tue, 15 Jan 2013 00:13:19 +0000<br>Subject: [Bldg-sim] HELP WANTED Senior and Intermediate Building Analysts (Vancouver, BC)<br>
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><b>Senior and Intermediate Building Analysts (Vancouver, BC)<u></u><u></u></b></p>
<p class="MsoNormal"><b>THE COMPANY<u></u><u></u></b></p>
<p class="MsoNormal">Our vision is to be the leading global deep green engineering practice. We believe that net zero energy buildings and living buildings need to become the norm within a generation.
We see ourselves as agents of change… catalysts.<u></u><u></u></p>
<p class="MsoNormal">Our passion for sustainable design runs deep. While being green has only recently entered the collective consciousness of North America, since inception, our firm has attracted
talented engineers from around the world. Engineers whose experience and training put them at the forefront of sustainable design practices and technologies. For us, sustainability is second nature and our design approach continues to be a reflection of our
commitment to creating a better future for generations to come.<u></u><u></u></p>
<p class="MsoNormal"><b>Trust. Nurture. Inspire.</b> As a relationship based people-centric firm, we are focused on making a difference in the world with the people we interact with. We have contributed
to an extensive list of high-profile projects around the world, and were ranked as one of Canada’s Top 50 Workplaces in 2007, 2009 & 2011.
<u></u><u></u></p>
<p class="MsoNormal"><b>THE POSITIONS<u></u><u></u></b></p>
<p class="MsoNormal">The
<b>Senior Building Analyst</b> will be a degree-qualified Mechanical Engineer with experience and full competency in building mechanical systems, building physics, thermodynamics and advanced building energy analysis. He/she will be a team player with the ability
to receive and execute instructions from the Team Leader or Project Manager and be responsible and accountable for completing the assigned projects on schedule and on budget independently with minimal guidance from the Team Leader or Project Manager. He/she
will be responsible for leading, coaching, organizing and effectively utilizing the production level staff to complete the assigned projects.
<u></u><u></u></p>
<p class="MsoNormal">The
<b>Intermediate Building Analyst</b> will be a degree-qualified Mechanical Engineer with experience and adequate working proficiency in building mechanical systems, building physics, thermodynamics and advanced building energy analysis. He/she will be a team
player with the ability to receive and execute instructions from the Team Leader and be responsible and accountable for completing the assigned projects on schedule and on budget under the Team Leader’s guidance and supervision.<u></u><u></u></p>
<p class="MsoNormal"><b>PRIMARY RESPONSIBILITIES<u></u><u></u></b></p>
<p style="margin-left:.25in">
<u></u><span style="font-size:11.0pt;font-family:Symbol"><span>·<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Receive and execute instructions from the Team Leader or Project Manager and be responsible and accountable for completing the assigned projects with required level
of quality, on schedule and on budget independently with minimal guidance from the Team Leader or Project Manager<u></u><u></u></span></p>
<p style="margin-left:.25in">
<u></u><span style="font-size:11.0pt;font-family:Symbol"><span>·<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Senior</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> - Lead, supervise, organize and effectively utilize the production level
staff to complete the assigned projects<u></u><u></u></span></p>
<p style="margin-left:.25in">
<u></u><span style="font-size:11.0pt;font-family:Symbol"><span>·<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Provide mentoring and coaching to staff with lower levels of responsibility and lesser qualification or experience<u></u><u></u></span></p>
<p style="margin-left:.25in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><b><u></u> <u></u></b></p>
<p class="MsoNormal"><b>SKILLS/QUALIFICATIONS<u></u><u></u></b></p>
<p class="MsoNormal" style="margin-left:.25in">
<u></u><span style="font-size:10.0pt;font-family:Symbol"><span>·</span></span><u></u>University degree in Mechanical Engineering or related engineering field is required<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.25in">
<u></u><span style="font-size:10.0pt;font-family:Symbol"><span>·</span></span><u></u><b>Senior</b> - Fully qualified PEng or ability to apply for PEng certification
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.25in">
<u></u><span style="font-size:10.0pt;font-family:Symbol"><span>·</span></span><u></u><b>Intermediate</b> – EIT with the ability to apply for PEng certification<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.25in">
<u></u><span style="font-size:10.0pt;font-family:Symbol"><span>·</span></span><u></u>Minimum 2 - 5 years of experience in building systems engineering, building physics, thermodynamics and advanced building energy analysis<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.25in">
<u></u><span style="font-size:10.0pt;font-family:Symbol"><span>·</span></span><u></u>Further certification in other related engineering or science fields (i.e. sustainable engineering) is beneficial<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.25in">
<u></u><span style="font-size:10.0pt;font-family:Symbol"><span>·</span></span><u></u>Fully competent in using advanced building energy modelling tools (IESve, DOE-2, or equivalent)<u></u><u></u></p>
<p class="MsoNormal"><b>CHARACTER<u></u><u></u></b></p>
<p class="MsoNormal">You are results oriented, enjoy challenging opportunities, have a positive attitude, are resourceful; and have a high degree of integrity, professional ethics, respect and sense
of responsibility. Integral Group is a dynamic, forward-thinking company with a great team environment and welcomes applications from like-minded individuals.<u></u><u></u></p>
<p class="MsoNormal">If you believe you have the above-mentioned qualifications and experience, we want to hear from you!<u></u><u></u></p>
<p class="MsoNormal">We offer a competitive compensation package, profit sharing, as well as excellent benefits, training, development, and an upbeat work environment.
<u></u><u></u></p>
<p class="MsoNormal">For further information, or to submit your application, please refer to our website:
<a href="http://www.integralgroup.com/careers/opportunities/" target="_blank">http://www.integralgroup.com/careers/opportunities/</a><u></u><u></u></p>
<p class="MsoNormal">We appreciate all expressions of interest and carefully review all resumes received. Regrettably, we are only able to contact applicants directly who are selected for interview. Thank you for your interest in Integral Group.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#333333"><img border="0" width="130" height="50" src="cid:image001.jpg@01CDF272.0F1F8590" alt="Integralgroup_Official_CMYK_Logo"></span></b><b><span lang="EN-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#333333"><u></u><u></u></span></b></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#333333">or distribution of the information contained on this email is prohibited.</span><u></u><u></u></p>
</div>
</div>
<br><br>---------- Forwarded message ----------<br>From: Doug Hittle <<a href="mailto:hittle.doug@gmail.com">hittle.doug@gmail.com</a>><br>To: Qinpeng Wang <<a href="mailto:qpwang@gatech.edu">qpwang@gatech.edu</a>><br>
Cc: <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>Date: Mon, 14 Jan 2013 19:58:03 -0700<br>Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?<br>I believe that E+ and predecessors take/took what ever was described<br>
as "internal mass" and parsed it into an equivalent "partition" of<br>
some "equivalent" area. This can lead to some counter intuitive<br>
results. Most might expect that "internal" or "thermal" mass is going<br>
to moderate energy transfer ("store"). But suppose I describe a<br>
banquet hall full of folding mdf or plywood tables (light weight).<br>
Compared to an empty room, the area available to absorb radiation and<br>
convect it to the room is increased by easily 1/3. All of a sudden the<br>
room is "fast" and energy gains are translated into cooling loads much<br>
more quickly.<br>
<br>
So let's agree with Joe that your question can be answered by "walking<br>
around." In looking around my office I find that one partition is<br>
covered with book cases and that the other side of the partition is<br>
also covered with books. If I thought this was an important feature<br>
that needed to be modeled (which I don't and which isn't) I would not<br>
describe any internal equivalent mass, I would simply describe a<br>
partition made up of books-air space-gyp board wall-air space-books.<br>
<br>
But why do I think this is irrelevant additional work? I can weigh<br>
some books to determine their density. We think books are heavy but<br>
imagine putting an equivalent volume of concrete in your backpack.<br>
Then they are not so "thermally massey". Also the books never receive<br>
direct sunlight and the temperature in my office varies little because<br>
it is in my heavily insulated, air tight home. Since the guzinta<br>
equals the guzouta over time and since the guzinta and guzouta, even<br>
for this massive double book lined partition, are near zero because<br>
the materials are at constant temperature, more or less, the mass of<br>
the books is not very important to the room energy balance.<br>
<br>
I don't know what thermal mass is anyway. The term must have evolved<br>
partly from passive solar designs, where energy storing materials<br>
exposed to the sun are important, and from the brick trade<br>
association who left a confusing legacy of claims that a masonry house<br>
had a higher R-value because of the "thermal mass." Mind you I think<br>
bricks are great, I have some myself. However, there is nothing in the<br>
definition of R-value that is labeled "brick."<br>
<br>
My apologies Dr. Wang. I expect that what I have just said is more or<br>
less useless as an answer to you questions. However, a productive<br>
guide to a first approach might be found in:<br>
<br>
Consider a Spherical Cow: A Course in Environmental Problem Solving, John Harte<br>
<br>
It is easier to bound a problem than to defend anybody's guess at the<br>
mean. The correct answer always seems to be "It Depends."<br>
<br>
Doug Hittle<br>
<br>
<br>
<br>
<br>
On Mon, Jan 14, 2013 at 1:16 PM, Qinpeng Wang <<a href="mailto:qpwang@gatech.edu">qpwang@gatech.edu</a>> wrote:<br>
><br>
> Dear colleagues,<br>
><br>
> I'm looking into furniture/internal mass modeling in energy models particularly within the environment of EnergyPlus but also not limited to that.<br>
><br>
> I have two questions I guess:<br>
><br>
> 1, Are there any modeling guide or reference building report that may give recommendations/instructions on how to represent furniture/internal mass inside a building if there is no much detailed information? I guess all I'm asking is are there any published data-set, or default values in terms of material property and area to represent furniture like what could be easily found about schedules and occupancy density?<br>
><br>
> COMNET modeling guide has only one paragraph about it and it mentioned "The interior thermal mass and modeling assumptions in the baseline building shall be the same as the proposed design."<br>
> Currently what I have is from Building America House Simulation Protocols: "The internal mass of furniture and contents shall be equal to 8 lb/ft2 of conditioned floor space. For solar distribution purposes, lightweight furniture covering 40% of the floor area shall be assumed."<br>
><br>
> 2, DOE reference commercial buildings have internal mass objects in the idf. file, where does the information come from?<br>
><br>
> Appreciate your input!<br>
><br>
> Best,<br>
><br>
> Qinpeng<br>
><br>
> --<br>
><br>
> Qinpeng Wang, PhD Student<br>
><br>
> College of Architecture<br>
><br>
> Georgia Institute of Technology<br>
><br>
> Atlanta, GA 30332-0155<br>
><br>
><br>
> _______________________________________________<br>
> Bldg-sim mailing list<br>
> <a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
> To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
><br>
<br>
<br><br>---------- Forwarded message ----------<br>From: Justin Spencer <<a href="mailto:jspencer17@gmail.com">jspencer17@gmail.com</a>><br>To: Doug Hittle <<a href="mailto:hittle.doug@gmail.com">hittle.doug@gmail.com</a>><br>
Cc: <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>, Qinpeng Wang <<a href="mailto:qpwang@gatech.edu">qpwang@gatech.edu</a>><br>Date: Mon, 14 Jan 2013 20:30:06 -0700<br>Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?<br>
There's also an issue here about whether or not there's any modeling of internal partitions or fixtures included in your model. My personal experience in modeling residential models is that they always lag more than you expect, so I've regularly responded by jacking up the internal mass. I certainly can fit metered HVAC data a lot better when I add mass beyond what the BABM suggests. I've guessed that's because my partitions don't quite match the amount of mass we're interacting with. <div>
<br></div><div>I get what Doug is saying that there isn't much temperature change occurring in his bookshelf, but when you have literally several tons of exposed mass, even a degree or two of temperature change is quite a bit of heat. Those granite counters currently in fashion do something for the building mass. </div>
<div><br></div><div>What's funny about this is that the conventional rule of thumb is that residential construction is "light" and has little impact from mass, while commercial buildings are "heavy" and have lots of mass impacts. My personal experience in studying this is that mass is extremely important in residential construction because they "float" a lot of the time and also have higher solar gains than commercial spaces. </div>
<div><br></div><div>One possible area of fruitful research I've thought about is to try and get some utility direct load control data and look at the "response time" of residences in terms of how long it took to have the temperature rise a certain amount when the HVAC system was constrained. You'd at least get some good data about how responsive the houses are supposed to be and alter what you can in your models to get them to better match real life (whether or not you actually figured out the root cause of the problem in the model). <br>
<br><div class="gmail_quote">On Mon, Jan 14, 2013 at 7:58 PM, Doug Hittle <span dir="ltr"><<a href="mailto:hittle.doug@gmail.com" target="_blank">hittle.doug@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I believe that E+ and predecessors take/took what ever was described<br>
as "internal mass" and parsed it into an equivalent "partition" of<br>
some "equivalent" area. This can lead to some counter intuitive<br>
results. Most might expect that "internal" or "thermal" mass is going<br>
to moderate energy transfer ("store"). But suppose I describe a<br>
banquet hall full of folding mdf or plywood tables (light weight).<br>
Compared to an empty room, the area available to absorb radiation and<br>
convect it to the room is increased by easily 1/3. All of a sudden the<br>
room is "fast" and energy gains are translated into cooling loads much<br>
more quickly.<br>
<br>
So let's agree with Joe that your question can be answered by "walking<br>
around." In looking around my office I find that one partition is<br>
covered with book cases and that the other side of the partition is<br>
also covered with books. If I thought this was an important feature<br>
that needed to be modeled (which I don't and which isn't) I would not<br>
describe any internal equivalent mass, I would simply describe a<br>
partition made up of books-air space-gyp board wall-air space-books.<br>
<br>
But why do I think this is irrelevant additional work? I can weigh<br>
some books to determine their density. We think books are heavy but<br>
imagine putting an equivalent volume of concrete in your backpack.<br>
Then they are not so "thermally massey". Also the books never receive<br>
direct sunlight and the temperature in my office varies little because<br>
it is in my heavily insulated, air tight home. Since the guzinta<br>
equals the guzouta over time and since the guzinta and guzouta, even<br>
for this massive double book lined partition, are near zero because<br>
the materials are at constant temperature, more or less, the mass of<br>
the books is not very important to the room energy balance.<br>
<br>
I don't know what thermal mass is anyway. The term must have evolved<br>
partly from passive solar designs, where energy storing materials<br>
exposed to the sun are important, and from the brick trade<br>
association who left a confusing legacy of claims that a masonry house<br>
had a higher R-value because of the "thermal mass." Mind you I think<br>
bricks are great, I have some myself. However, there is nothing in the<br>
definition of R-value that is labeled "brick."<br>
<br>
My apologies Dr. Wang. I expect that what I have just said is more or<br>
less useless as an answer to you questions. However, a productive<br>
guide to a first approach might be found in:<br>
<br>
Consider a Spherical Cow: A Course in Environmental Problem Solving, John Harte<br>
<br>
It is easier to bound a problem than to defend anybody's guess at the<br>
mean. The correct answer always seems to be "It Depends."<br>
<span><font color="#888888"><br>
Doug Hittle<br>
</font></span><div><div><br>
<br>
<br>
<br>
On Mon, Jan 14, 2013 at 1:16 PM, Qinpeng Wang <<a href="mailto:qpwang@gatech.edu" target="_blank">qpwang@gatech.edu</a>> wrote:<br>
><br>
> Dear colleagues,<br>
><br>
> I'm looking into furniture/internal mass modeling in energy models particularly within the environment of EnergyPlus but also not limited to that.<br>
><br>
> I have two questions I guess:<br>
><br>
> 1, Are there any modeling guide or reference building report that may give recommendations/instructions on how to represent furniture/internal mass inside a building if there is no much detailed information? I guess all I'm asking is are there any published data-set, or default values in terms of material property and area to represent furniture like what could be easily found about schedules and occupancy density?<br>
><br>
> COMNET modeling guide has only one paragraph about it and it mentioned "The interior thermal mass and modeling assumptions in the baseline building shall be the same as the proposed design."<br>
> Currently what I have is from Building America House Simulation Protocols: "The internal mass of furniture and contents shall be equal to 8 lb/ft2 of conditioned floor space. For solar distribution purposes, lightweight furniture covering 40% of the floor area shall be assumed."<br>
><br>
> 2, DOE reference commercial buildings have internal mass objects in the idf. file, where does the information come from?<br>
><br>
> Appreciate your input!<br>
><br>
> Best,<br>
><br>
> Qinpeng<br>
><br>
> --<br>
><br>
> Qinpeng Wang, PhD Student<br>
><br>
> College of Architecture<br>
><br>
> Georgia Institute of Technology<br>
><br>
> Atlanta, GA 30332-0155<br>
><br>
><br>
</div></div><div><div>> _______________________________________________<br>
> Bldg-sim mailing list<br>
> <a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
> To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
><br>
_______________________________________________<br>
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<a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
</div></div></blockquote></div><br></div>
<br><br>---------- Forwarded message ----------<br>From: Philip Haves <<a href="mailto:phaves@lbl.gov">phaves@lbl.gov</a>><br>To: <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>, E+Sup <<a href="mailto:EnergyPlus_Support@yahoogroups.com">EnergyPlus_Support@yahoogroups.com</a>><br>
Cc: <br>Date: Mon, 14 Jan 2013 20:04:22 -0800<br>Subject: [Bldg-sim] HELP WANTED: Lawrence Berkeley National Laboratory<br><u></u>
<div text="#000000" bgcolor="#ffffff">
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span>(Apologies for
cross-posting)<br>
</span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span>Lawrence Berkeley National
Laboratory has two new openings in the Simulation Research
Group:</span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span>1. Senior Scientific
Engineering Associate. The main duties
will include further development of EnergyPlus, particularly
modeling of HVAC
systems, and development of advanced simulation methods. <br>
<br>
Details are posted at:</span><span style="font-size:10pt;font-family:"Courier New""> <br>
</span><span><a href="https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75476" target="_blank"><span style="font-size:10pt;color:rgb(17,65,112)">https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75476</span></a></span><span style="font-size:10pt;font-family:"Courier New""><br>
<br>
</span><span>For an informal discussion about
this opening, call Philip Haves <a href="tel:%28510%20486%206512" target="_blank"><span style="color:windowtext;text-decoration:none">(510 486
6512</span></a>).<br>
</span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span><br>
2. Postdoctoral Fellow. The main duties include development of
methods
and models to simulate the energy performance of buildings at
the urban scale and the development of
methods and models to simulate human energy behavior. <br>
<br>
Details are posted at: <br>
</span><span><a href="https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75476" target="_blank"><span style="font-size:10pt;color:rgb(17,65,112)">https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=75499</span></a></span><span style="font-size:10pt;font-family:"Courier New""><br>
<br>
</span><span>For an informal discussion about
this opening, call Tianzhen Hong <a href="tel:%28510%20486%207082" value="+15104867082" target="_blank">(510 486 7082</a>).<br>
<br>
</span></p>
<pre cols="72">--
Philip Haves
Leader, Simulation Research Group
Lawrence Berkeley National Laboratory
One Cyclotron Road, MS 90R3111
Berkeley, CA 94720-8134
<a href="tel:%28510%29%20486%206512" value="+15104866512" target="_blank">(510) 486 6512</a> (office)
<a href="tel:%28510%29%20486%204089" value="+15104864089" target="_blank">(510) 486 4089</a> (fax)</pre>
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<br><br>---------- Forwarded message ----------<br>From: Joe Huang <<a href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>><br>To: <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
Cc: <br>Date: Mon, 14 Jan 2013 21:13:00 -0800<br>Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?<br><u></u>
<div text="#000000" bgcolor="#ffffff">
I've had the same experience when comparing simulation results to
measured indoor temperatures for a typical house in California. The
actual house temperatures were substantially more flattened and
lagged compared to what the simulation showed. It may be that
getting the right number on the amount of internal mass might not
necessarily result in a house model that responds similar to a real
building. Then you have to decide whether to "tune" the model to be
physically correct or thermally correct!<br>
<br>
Joe<br>
<pre cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>
<a href="http://www.whiteboxtechnologies.com" target="_blank">www.whiteboxtechnologies.com</a>
(o) <a href="tel:%28925%29388-0265" value="+19253880265" target="_blank">(925)388-0265</a>
(c) <a href="tel:%28510%29928-2683" value="+15109282683" target="_blank">(510)928-2683</a>
"building energy simulations at your fingertips"
</pre>
<br>
On 1/14/2013 7:30 PM, Justin Spencer wrote:
<blockquote type="cite">
There's also an issue here about whether or not there's any
modeling of internal partitions or fixtures included in your
model. My personal experience in modeling residential models is
that they always lag more than you expect, so I've regularly
responded by jacking up the internal mass. I certainly can fit
metered HVAC data a lot better when I add mass beyond what the
BABM suggests. I've guessed that's because my partitions don't
quite match the amount of mass we're interacting with.
<div>
<br>
</div>
<div>I get what Doug is saying that there isn't much temperature
change occurring in his bookshelf, but when you have literally
several tons of exposed mass, even a degree or two of
temperature change is quite a bit of heat. Those granite
counters currently in fashion do something for the building
mass. </div>
<div><br>
</div>
<div>What's funny about this is that the conventional rule of
thumb is that residential construction is "light" and has little
impact from mass, while commercial buildings are "heavy" and
have lots of mass impacts. My personal experience in studying
this is that mass is extremely important in residential
construction because they "float" a lot of the time and also
have higher solar gains than commercial spaces. </div>
<div><br>
</div>
<div>One possible area of fruitful research I've thought about is
to try and get some utility direct load control data and look at
the "response time" of residences in terms of how long it took
to have the temperature rise a certain amount when the HVAC
system was constrained. You'd at least get some good data about
how responsive the houses are supposed to be and alter what you
can in your models to get them to better match real life
(whether or not you actually figured out the root cause of the
problem in the model). <br>
<br>
<div>On Mon, Jan 14, 2013 at 7:58 PM, Doug Hittle <span><<a href="mailto:hittle.doug@gmail.com" target="_blank">hittle.doug@gmail.com</a>></span>
wrote:<br>
<blockquote>
I believe that E+ and predecessors take/took what ever was
described<br>
as "internal mass" and parsed it into an equivalent
"partition" of<br>
some "equivalent" area. This can lead to some counter
intuitive<br>
results. Most might expect that "internal" or "thermal" mass
is going<br>
to moderate energy transfer ("store"). But suppose I
describe a<br>
banquet hall full of folding mdf or plywood tables (light
weight).<br>
Compared to an empty room, the area available to absorb
radiation and<br>
convect it to the room is increased by easily 1/3. All of a
sudden the<br>
room is "fast" and energy gains are translated into cooling
loads much<br>
more quickly.<br>
<br>
So let's agree with Joe that your question can be answered
by "walking<br>
around." In looking around my office I find that one
partition is<br>
covered with book cases and that the other side of the
partition is<br>
also covered with books. If I thought this was an important
feature<br>
that needed to be modeled (which I don't and which isn't) I
would not<br>
describe any internal equivalent mass, I would simply
describe a<br>
partition made up of books-air space-gyp board wall-air
space-books.<br>
<br>
But why do I think this is irrelevant additional work? I can
weigh<br>
some books to determine their density. We think books are
heavy but<br>
imagine putting an equivalent volume of concrete in your
backpack.<br>
Then they are not so "thermally massey". Also the books
never receive<br>
direct sunlight and the temperature in my office varies
little because<br>
it is in my heavily insulated, air tight home. Since the
guzinta<br>
equals the guzouta over time and since the guzinta and
guzouta, even<br>
for this massive double book lined partition, are near zero
because<br>
the materials are at constant temperature, more or less, the
mass of<br>
the books is not very important to the room energy balance.<br>
<br>
I don't know what thermal mass is anyway. The term must have
evolved<br>
partly from passive solar designs, where energy storing
materials<br>
exposed to the sun are important, and from the brick trade<br>
association who left a confusing legacy of claims that a
masonry house<br>
had a higher R-value because of the "thermal mass." Mind you
I think<br>
bricks are great, I have some myself. However, there is
nothing in the<br>
definition of R-value that is labeled "brick."<br>
<br>
My apologies Dr. Wang. I expect that what I have just said
is more or<br>
less useless as an answer to you questions. However, a
productive<br>
guide to a first approach might be found in:<br>
<br>
Consider a Spherical Cow: A Course in Environmental Problem
Solving, John Harte<br>
<br>
It is easier to bound a problem than to defend anybody's
guess at the<br>
mean. The correct answer always seems to be "It Depends."<br>
<span> <br>
Doug Hittle<br>
</span>
<div>
<div><br>
<br>
<br>
<br>
On Mon, Jan 14, 2013 at 1:16 PM, Qinpeng Wang <<a href="mailto:qpwang@gatech.edu" target="_blank">qpwang@gatech.edu</a>>
wrote:<br>
><br>
> Dear colleagues,<br>
><br>
> I'm looking into furniture/internal mass modeling
in energy models particularly within the environment of
EnergyPlus but also not limited to that.<br>
><br>
> I have two questions I guess:<br>
><br>
> 1, Are there any modeling guide or reference
building report that may give
recommendations/instructions on how to represent
furniture/internal mass inside a building if there is no
much detailed information? I guess all I'm asking is are
there any published data-set, or default values in terms
of material property and area to represent furniture
like what could be easily found about schedules and
occupancy density?<br>
><br>
> COMNET modeling guide has only one paragraph about
it and it mentioned "The interior thermal mass and
modeling assumptions in the baseline building shall be
the same as the proposed design."<br>
> Currently what I have is from Building America
House Simulation Protocols: "The internal mass of
furniture and contents shall be equal to 8 lb/ft2 of
conditioned floor space. For solar distribution
purposes, lightweight furniture covering 40% of the
floor area shall be assumed."<br>
><br>
> 2, DOE reference commercial buildings have internal
mass objects in the idf. file, where does the
information come from?<br>
><br>
> Appreciate your input!<br>
><br>
> Best,<br>
><br>
> Qinpeng<br>
><br>
> --<br>
><br>
> Qinpeng Wang, PhD Student<br>
><br>
> College of Architecture<br>
><br>
> Georgia Institute of Technology<br>
><br>
> Atlanta, GA 30332-0155<br>
><br>
><br>
</div>
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</blockquote>
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</blockquote>
</div>
<br><br>---------- Forwarded message ----------<br>From: Chris Yates <<a href="mailto:chris.malcolm.yates@gmail.com">chris.malcolm.yates@gmail.com</a>><br>To: Qinpeng Wang <<a href="mailto:qpwang@gatech.edu">qpwang@gatech.edu</a>><br>
Cc: <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>Date: Tue, 15 Jan 2013 07:13:01 +0000<br>Subject: Re: [Bldg-sim] Internal mass modeling guidance in E+?<br><p dir="ltr">Perhaps mass could be related to occupancy quite easily. After all every person needs a few square feet of desk, possibly some filing.</p>
<p dir="ltr">There is probably quite a simple arithmetic formula that holds true for most situations, the arguments of which might be:<br>
• occupant density<br>
• desk space per occupant<br>
• material thickness<br>
• extra shelving required?</p>
<p dir="ltr">Ignore anything with less mass.</p>
<p dir="ltr">If you come up with an excel formula, I'd like a copy ;o)</p>
<p dir="ltr">Sent from my Android device. Please excuse typos, etc.</p>
<div class="gmail_quote">On 14 Jan 2013 20:16, "Qinpeng Wang" <<a href="mailto:qpwang@gatech.edu" target="_blank">qpwang@gatech.edu</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">Dear colleagues,<br>
<br>
I'm looking into furniture/internal mass modeling in energy models particularly
within the environment of EnergyPlus but also not limited to that. <br>
<br>
I have two questions I guess:<br>
<br>
1, Are there any modeling guide or reference building report that may give
recommendations/instructions on how to represent furniture/internal mass inside
a building if there is no much detailed information? I guess all I'm asking is
are there any published data-set, or default values in terms of material
property and area to represent furniture like what could be easily found about
schedules and occupancy density?<br>
<br>
COMNET modeling guide has only one paragraph about it and it mentioned
"The interior thermal mass and modeling assumptions in the baseline
building shall be the same as the proposed design."<br>
Currently what I have is from Building America House Simulation Protocols:
"The internal mass of furniture and contents shall be equal to 8 lb/ft2 of
conditioned floor space. For solar distribution purposes, lightweight furniture
covering 40% of the floor area shall be assumed."<br>
<br>
2, DOE reference commercial buildings have internal mass objects in the idf.
file, where does the information come from?<br>
<br>
Appreciate your input!<br>
<br>
Best,<br>
<br>
Qinpeng<br clear="all">
<br>
-- </span></p>
<p class="MsoNormal" style="line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#1f497d">Qinpeng Wang, PhD
Student</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p>
<p class="MsoNormal" style="line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#1f497d">College of
Architecture</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p>
<p class="MsoNormal" style="line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#1f497d">Georgia Institute of
Technology</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p>
<p class="MsoNormal" style="line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#1f497d">Atlanta, GA 30332-0155</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p>
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<br><br>---------- Forwarded message ----------<br>From: Shruti Kasarekar <<a href="mailto:shrutiak@gmail.com">shrutiak@gmail.com</a>><br>To: bldg-sim <<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>>, <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
Cc: <br>Date: Tue, 15 Jan 2013 11:01:57 -0800<br>Subject: [Bldg-sim] Technical Staff position at Atelier Ten, San Francisco<br><div dir="ltr"><h1><font size="4">Technical Staff</font> </h1><p>Atelier Ten, an environmental and lighting design consulting firm, is seeking a full-time Technical Staff member to join our San Francisco office. This position reports to an Associate.</p>
<p>A Technical Staff member supports interdisciplinary consulting teams with research, calculations, daylighting analysis, technical writing, LEED program administration, or any other technical analysis as required under the direction of Associates and Environmental Designers. The successful candidate will also assist other staff with energy analysis -related work, primarily with DOE2 modeling software. This person may manage aspects of individual projects as assigned, including responsibility for selected deliverables. The Technical Staff member may be asked to participate in business and professional development initiatives in coordination with senior management.</p>
<p>Technical staff are expected to follow guidelines for project quality assurance , frequently review project timelines and budgets with project managers, demonstrate an empathy with Atelier Ten’s approach, and be committed to the development of high-quality, high-performance and sustainable buildings via the appropriate technical, project management, and quality control standards. </p>
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<p><strong>Experience</strong><br>Proficiency in Microsoft Excel required. Proficiency in Visual Basic, scripting, 3-D architectural modeling, AutoCad, Adobe InDesign and Illustrator, and hand-drawing ability preferred. Professional or internship experience in architecture or engineering offices preferred.</p>
<p><strong>Interested candidates should submit a CV and cover letter to <a href="mailto:usa.recruitment@atelierten.com" target="_blank"><font color="#0066cc">usa.recruitment@atelierten.com</font></a>. Please reference “A10_SF_Tech Staff” in your subject line.</strong></p>
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</font><span><span style="color:rgb(64,64,64);font-family:"Franklin Gothic Book","sans-serif";font-size:10pt">Shruti Kasarekar
<br>
Atelier Ten</span></span></p><p><font color="#000000" size="3" face="Times New Roman">
</font><a href="http://www.atelierten.com/" target="_blank"><span><span style="color:blue;font-family:"Segoe UI","sans-serif";font-size:10pt">www.atelierten.com</span></span><span></span></a><span><span style="font-family:"Segoe UI","sans-serif";font-size:10pt"></span></span></p>
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<br><br>---------- Forwarded message ----------<br>From: John Aulbach <<a href="mailto:jra_sac@yahoo.com">jra_sac@yahoo.com</a>><br>To: "<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>" <<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>><br>
Cc: <br>Date: Tue, 15 Jan 2013 12:08:30 -0800 (PST)<br>Subject: [Bldg-sim] Window Film Product Claims<br><div><div style="font-size:12pt;font-family:times new roman,new york,times,serif"><div><span><br></span></div><div>Hi Folks:</div>
<div><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">This has to do with modeling in general.</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">I have a Window Film manufacturer with a product called Enerlogic VEP35 window film. It is apparently applied to the inside of a window.</div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
The manufacturer claims that this product lowers the U-Value of single pane glass (1/4" or 6 mm) from 1.109 to 0.6. And with no air space between the film and the glass. "Revolutionary new technology"</div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
Has anyone ever run into this product before? Why does this claim sound "too good to be true" ??</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">Thanks.</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">John Aulbach</div> </div></div><br>_______________________________________________<br>
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