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</o:shapelayout></xml><![endif]--></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:#1F497D'>Taylor,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Heat gains from lighting in spaces is shared between the space and its plenum depending on the values for LIGHT-TO-SPACE and LIGHT-TO-RETURN. For other electrical equipment and for occupants, the heat gains all go to the space, but are divided into latent and sensible components. I believe all of the electricity consumed by lighting and equipment is converted to heat gains. The heat gains are converted to cooling loads using weighting factors. The weighting factors can be modified by specifying the convective/radiative splits, through keywords light LIGHT-RAD-FRAC. The radiative portion can be absorbed by walls and furniture and so does not create an immediate (for that hour) cooling load.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You can create custom hourly reports to see how this plays out in the building by using the “Building Loads” variable and selecting “Building light heat load”, “Building light cool load” and “Building light elec total”. Similar variables can be selected for individual spaces.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If you haven’t already downloaded it, I recommend looking at the DOE-2 Engineers Manual: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://doe2.com/download/DOE-21E/DOE-2EngineersManualVersion2.1A.pdf">http://doe2.com/download/DOE-21E/DOE-2EngineersManualVersion2.1A.pdf</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Section 2.5 – Interior Loads describes the algorithms for loads calculations.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Keep in mind that changing your lighting and equipment values will impact cooling energy as well. You may be seeing small changes in heating energy but much larger changes in cooling energy, depending on other factors like your envelope, ventilation loads etc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bill<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img border=0 width=486 height=116 id="Picture_x0020_1" src="cid:image001.jpg@01CC8404.AC6B71C0" alt="Senior Energy Engineer"><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><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-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Taylor Sharpe<br><b>Sent:</b> Wednesday, October 05, 2011 11:18 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Lighting densities and Electrical equipmentcontributing to Space Heating<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Hi everyone,<br><br>I feel that this topic must have been discussed at some point, but an exhaustive archive search got me nowhere, so I thought I'd throw together a post of my own, especially since I'm working on an eQuest model of a small server building which is heated in part by a large number of computers that run many hours every day.<br><br>I'm interested in how eQuest treats electric loads - from lights, computers, refrigerators, etc - as regards space heating. I had always assumed that, especially in the case of lights, much of the energy used would be converted to heat within the building, and contribute to space heating.<br clear=all><br>However, I set up an experiment to test this and found that the results were far different from what I'd expected: I upped the lighting density in an existing natural-gas-heated building model by about 15x and compared the electric use from before and after the lights were increased. I converted all values to mmBtus for easy comparison. To my surprise, I found that only a very small fraction (about 6%) of the mmBtus added to the building through those lights contributed to space heat. The kWh recorded were increased hugely, but the heating energy required to keep the building heated was almost the same in both cases.<br><br>I repeated the experiment, upping misc. equipment instead of lighting, and saw a similar result.<br><br>Does anyone have any knowledge of what equations eQuest uses to decide how much electrical energy use is converted to heat and added to the space in which it is installed?<br><br>Regards,<br>Taylor Sharpe<br>Sharpe Energy Solutions<br><a href="mailto:newspectrum@gmail.com" target="_blank">newspectrum@gmail.com</a><br>(541-840-5698)<o:p></o:p></p></div></body></html>