<div>I have found with my own projects that even sometimes when the HVAC designer has specified a specific capacity for htg water equipment that sometime in my model file I still have unmet loads for htg. I suggest at this point specify additional htg capacity by either increasing the reheat delta-T from say 30F to 50F and/or adding zone level baseboards. By adding the baseboards you are adding a component of the system that will supplement the skin losses being experienced by the simulation model.</div>
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<div>by adding baseboards for the additional requrired heat then you should be able to meet your heating loads.</div>
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<div>hope this helps,</div>
<div>pasha<br><br></div>
<div class="gmail_quote">On Thu, Jun 10, 2010 at 7:38 PM, Robert Des Rosiers <span dir="ltr"><<a href="mailto:desrosiers@studioma.com">desrosiers@studioma.com</a>></span> wrote:<br>
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<p class="MsoNormal">All:</p>
<p class="MsoNormal">I have completed an energy model for a baseline scenario from which to compare my proposed design. The baseline HVAC system is a constant volume single zone AHU w/ no reheat; the AHU is served by HW and CHW loop from a central plant. I have set this up in eQuest as a "Variable Air Volume" system type with the AHU fan control set to "Constant Volume"; my thought here is that each zone fed by the AHU will control temperature using a VAV box w/ no local reheat or cooling. Flow and temperature from the AHU will be delivered based on the coolest or warmest zone it serves.</p>
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<p class="MsoNormal">All seems fine with the design flows, ventilation flows and cooling capacities. My problem is with the heating capacity as I have excessive unmet heating hours (50,000). I have allowed eQuest to size the heating capacity of the preheat and heating coil as well as the minimum flow ratios. <u>Does anyone have any thoughts as to what is causing these unmet heating load hours? Is the way I have set-up the desired baseline HVAC system incorrect?</u></p>
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<p class="MsoNormal">Any guidance is greatly appreciated. Thanks -</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="COLOR: #1f497d">Robert Des Rosiers, LEED-AP</span></p>
<p class="MsoNormal"><b><span style="COLOR: #1f497d">STUDIO MA</span></b></p>
<p class="MsoNormal"><span style="COLOR: #1f497d">130 N Central Avenue, No.300 Phoenix, Arizona 85004</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d">Telephone 602 251 3800</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d">Fax 602 251 3100</span></p>
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