<div>Hi Shubha</div>
<div> </div>
<div>I agree with Chris that you could not simply use baseboard to represent radiant heating floor, especially when you will have to further modify the physical properties of the material (your high reflectivity and low absorptivity foil) below hot water tubes. Modeling radiant floor in IES VE is way more complicated than some general workaround such as using 4 pipe fan coil without fan power. However it does trace the complicacy of the physical performance of radiant slab. I guess the hypothesis of such simulation is that the radiant floor with the foil can effectively 'move' more heat to the above space? The interaction between the foil and the radiant slab will be seamless and they can't be modelled separately in your case. Any workaround or simplification should respect the interaction and physical performance of radiant slab. </div>
<div> </div>
<div>CMU has many professionals who know Energy Plus and other simulation tools very well. Probably you may seek their help in the area of radiant slab first. Good luck! </div>
<div> </div>
<div><font face="comic sans ms,sans-serif">Regards, </font></div>
<div><font face="comic sans ms,sans-serif"></font> </div>
<div><font face="comic sans ms,sans-serif">Cheney</font></div>
<div><font face="comic sans ms,sans-serif"></font> </div>
<div><font face="comic sans ms,sans-serif">LinkedIN @ </font><a href="http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b" target="_blank"><font face="comic sans ms,sans-serif">http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b</font></a><font face="comic sans ms,sans-serif"> </font></div>
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<div class="gmail_quote">On Thu, Apr 14, 2011 at 10:12 AM, Chris <span dir="ltr"><<a href="mailto:floodyc@gmail.com">floodyc@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote"><font color="#000066"><font face="comic sans ms,sans-serif">A radiant floor performs vastly different to hydronic baseboards and that workaround is not a valid approach in my opinion. Having an understanding of the physics involved in the performance of radiant slabs and their influence on space heating is essential before any modeling takes palce.<br>
</font></font>
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<div></div>
<div class="h5"><br>
<div class="gmail_quote">On Thu, Apr 14, 2011 at 09:40, Shubha Mohunta <span dir="ltr"><<a href="mailto:shubha.mohunta@gmail.com" target="_blank">shubha.mohunta@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Thanks Cheney,
<div><br></div>
<div>This project uses Heat pumps for cooling and radiant floors for heating. So to model this i have used Heat pumps ( with just cooling) as my primary system and attached baseboards to them to simulate radiant floors. </div>
<div><br></div>
<div>Do u think this would work?</div>
<div><br></div>
<div>Shubha</div>
<div><br>
<div class="gmail_quote">On Tue, Apr 12, 2011 at 4:53 PM, Cheney <span dir="ltr"><<a href="mailto:chenyu73@gmail.com" target="_blank">chenyu73@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div>Hi, </div>
<div> </div>
<div>I doubt you are able to simulate it by using eQuest. However, it is possible to simulate it in IES VE (I guess TAS and Energy+ can do the same thing). Radiant floor can be simulated by 1. top concrete (e.g. 2" of concrete); 2. radiant piping zone; 3. floor assembly below the radiant piping. For your case, reflectivity, emiissivity (probably conductivity) should be modified accordingly between layer 2 and 3. </div>
<div> </div>
<div><font face="comic sans ms,sans-serif">Regards, </font></div>
<div><font face="comic sans ms,sans-serif"></font> </div>
<div><font face="comic sans ms,sans-serif">Cheney</font></div>
<div><font face="comic sans ms,sans-serif"></font> </div>
<div><font face="comic sans ms,sans-serif">LinkedIN @ </font><a href="http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b" target="_blank"><font face="comic sans ms,sans-serif">http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b</font></a><font face="comic sans ms,sans-serif"> </font></div>
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<div class="gmail_quote">
<div>
<div></div>
<div>On Tue, Apr 12, 2011 at 12:02 PM, Shubha Mohunta <span dir="ltr"><<a href="mailto:shubha.mohunta@gmail.com" target="_blank">shubha.mohunta@gmail.com</a>></span> wrote:<br></div></div>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div>
<div></div>
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<div class="gmail_quote">
<div>Hi,</div>
<div><br></div>The building i am modeling has steel frame floor which separates the conditioned space from unconditioned basement. There are hot water tubes running underneath between the steel joists for radiant heating. There is no use of insulation except for v thin aluminium foil below radiant tubes which is fixed to the steel joists using magnets. This foil helps with high reflectivity and low thermal absorption prevents heat transfer to the unconditioned basement.
<div><br></div>
<div>Can somebody give me ideas how to model this ? I am using eQUEST </div>
<div><br></div>
<div>Thanks,</div>
<div><br></div>
<div>Regards,</div>
<div><br></div><font color="#888888">
<div>Shubha Mohunta, LEED Green Assoc. </div>
<div>M.S. Sustainable Design</div>
<div>Carnegie Mellon University</div></font></div><br><br></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>
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</div></div><font color="#888888">-- <br>Chris Flood BSc (Eng)<br>Senior Building Analyst<br></font></blockquote></div><br>