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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Good Afternoon Everyone,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am modeling a building which has unconditioned stairwells with emergency water piping running vertically to the top. During the renovation there was concern that during the winter months those pipes could freeze. To prevent that the HVAC engineer added unit heaters on the first floor of the stairwell to maintain the temperature no less than 40F. I think I input everything correctly to my model to account for this load but the results are not what I expect. Here’s what I did.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I created a new thermostat schedule for heating at 40F year round. I then changed the system type to a unit heater. Under the system heating tab I specified it was electric heat and entered the heating capacity. Back in the zone tab I space type from unconditioned to conditioned and specified the new thermostat schedule. Since there will be no cooling I specified a very high design temperature (100F) so that I would not have any unmet cooling hours. Under the zone heating tab I then specified a maximum heating rate.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When I ran the model I saw very little overall consumption change(which I would expect), however, the heating load went down slightly, the cooling load went up slightly, and the fan load increased the most. Is this not the right approach for adding this kind of load the building? Has anyone ever added something similar? Thanks for any advice you might have.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'><br>Michael Shields<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>