<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt;color:#007f7f;"><span style="color: rgb(0, 0, 0);">I</span> <span style="color: rgb(0, 0, 0);">have a project that is giving me some odd results.</span><br><br><span style="color: rgb(0, 0, 0);">It is a mid rise apartment building modeled with PTHP units in each apartment. A DOAS system feeds ventilation air to each PTHP.</span><br style="color: rgb(0, 0, 0);"><br style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);">In the shoulder months (Jan-May & Sep-Dec) I am getting a significant amount of simultaneous heating and cooling during the same hour as reported in the Hourly Reports. I checked the kW to Heat and kW to Cool for the PTHP units in the Hourly Report.</span><br style="color: rgb(0, 0, 0);"><br style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);">I am
not controlling humidity, so the heat energy is not for reheat.</span><br style="color: rgb(0, 0, 0);"><br style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);">Does anyone know what energy is included in the kW to Heat and kW to Cool? Is this simultaneous energy because the units are defrosting? I chose reverse cycle defrost. It is possible that the unit goes into defrost, which counts as kW to Cool, then after the defrost is complete the unit switches to heating mode because the space temperature dropped during the defrost cycle?</span><br><br><span style="color: rgb(0, 0, 0);">I left the throttling range at the default of .3 degrees.</span><br style="color: rgb(0, 0, 0);"><br style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);">Thank you for any help,</span><br><br><div> </div><span style="color: rgb(0, 0, 0);">Paul Diglio, CEM, CBCP</span><br style="color: rgb(0, 0, 0);"><br style="color: rgb(0, 0,
0);"><div style="color: rgb(0, 0, 0);">87 Fairmont Avenue<br>New Haven, CT 06513<br>203-415-0082</div><br style="color: rgb(0, 0, 0);"><br style="color: rgb(0, 0, 0);"><div><span style="color: rgb(0, 0, 0);"><span><a target="_blank" href="http://www.pdigliollc.com">www.pdigliollc.com</a></span></span><div><br></div></div>
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