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Heating Consumption is too small in ClimateZone4A

Hi, I model the baseline in OpenStudio according to ASHRAE 90.1 APP G for a apartment in NYC, the hvac system is PTAC. The heating consumption is too small to compare with cooling consumption (1:2 approx). According to the previous experience, the heating consumption is too low.

OSM file and simulation result are shown below:

model

image description

Does anyone can help me to figure out what's going on and diagnose the problem in this model?

dalin_si's avatar
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dalin_si
asked 2017-03-03 11:37:48 -0500
__AmirRoth__'s avatar
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__AmirRoth__
updated 2017-08-07 13:49:29 -0500
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If your heating looks low, I would check what your outdoor air rates are. How much is being brought into each apartment zone (if any at all). Is that the amount you want? Is it being brought into the apartments 24/7?

TaylorRoberts's avatar TaylorRoberts (2017-03-06 16:51:25 -0500) edit
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Thank you taylor

dalin_si's avatar dalin_si (2017-03-10 14:43:56 -0500) edit
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1 Answer

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I noticed that your PTAC system schedule in each thermal zone is set on "always on discrete". Select "Thermal Zones", pick a "Zone Equipment", go to the "edit" tab, select the gear icon to access the options. Check out "Availability Schedule Name" for each zone equipment and make sure a correct schedule is selected. I assume it will change your heating load. Let me know if it works. Otherwise, I will check it out in more details. Good luck!

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Ehsank's avatar
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Ehsank
answered 2017-03-05 15:13:33 -0500, updated 2017-03-05 15:14:22 -0500
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