Hi Linda,<br><br>Funny you ask, I am currently experimenting with modeling UFAD systems in eQuest (and would appreciate feedback on my methods from the bldg sim group).<br><br>The application I'm working on is for core zones only, so the loads are people, lighting, equipment (cooling loads) and outdoor air ventilation.<br>
<br>A few notes on UFAD systems in general:<br><br>Supply air for UFAD (under floor air distribution systems) is supplied through diffusers in floor panels. Correct design results in stratification (see <a href="http://www.hpac.com/Issue/Article/38686/38686#f1">http://www.hpac.com/Issue/Article/38686/38686#f1</a> for explanation).<br>
<br>Cooling supply air temperature is usually around 63-65 F<br><br>The thermostat is usually located at 48"<br><br>In cooling mode, air is supplied low at a relatively high temperature and returned high at a higher temperature, this allows a greater dT across the cooling coil.<br>
<br>In order to model this system, the stratification of the space and higher return air temperatures must be taken into account. To achieve this, I split each room into an upper and lower section at about 5'. The upper space is designated as a return air plenum and contains all lighting loads (except for task lighting loads). The lower section contains the people loads and the equipment loads. Any exterior windows or doors should be distributed across the elevation of both spaces representing actual building design. The upper and lower sections are split with a horizontal partition of type "air barrier." I then run the model to determine the difference in space temperature between upper and lower room sections, during hours when the building is conditioned (fan "on" hours). I look for a difference of about 2 degrees F for times when the space is in cooling mode. For the systems I have tried, I usually end up the yearly average for "fan-on" hours to be about 1 degree F. This number can be changed by adjusting the U-value of the partition, and adjusting the internal loads (within reason), if necessary.<br>
<br>I set the thermostat for the space to be 1 degree cooler than the baseline case.<br><br>Supply air temperature is 63-65 degrees, depending on design. The supply fan may also have a lower pressure drop than the base case.<br>
<br>I have modeled the system as Packaged Multizone with heating locked out above 65 degrees, and cooling locked out below 65 degrees to simulate bypass (this method is documented in the DOE2.2 help file).<br><br>So far with this method, I have come up with energy savings of 15-20% for both cooling and fan energy, which is consistent with the range given by UFAD documentation. <br>
<br>If anyone has information regarding UFAD systems and heating energy use, I'm interested.<br><br>~karen~<br><br><br><br><br><div class="gmail_quote">On Tue, Mar 4, 2008 at 5:07 PM, Lam, Linda <<a href="mailto:linda.lam@sf.fk.com" target="_blank">linda.lam@sf.fk.com</a>> wrote:<br>
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Hello All</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Does anyone know where I can find documentation on how to
model underfloor air systems in Energypro?</span></font></p>
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Thanks!</span></font></p>
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<p><b><font color="#333333" face="Arial" size="3"><span style="font-size: 12pt; font-family: Arial; color: rgb(51, 51, 51); font-weight: bold;">Linda
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