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Calculating HVAC energy consumption

asked 2018-01-12 16:14:18 -0500

mifg8's avatar

Hi, I am new in EnergyPlus and facing trouble of calculating the energy consumption required for HVAC for 24 hours. I have simulated for a single day and am getting result for 6:15 am to 9:00 pm while other values are zero. How can I fix the problem? Please help me. Thanks!!!

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What are your settings for the HVAC availability profiles? If you are actually simulating for a full day but not seeing HVAC results, then it's likely that the system isn't running at night (which sounds reasonable).

bbrannon4's avatar bbrannon4  ( 2018-01-12 16:54:48 -0500 )edit

Thanks bbrannon4. Can you please help me to find the option where I can check the HVAC availability?

mifg8's avatar mifg8  ( 2018-01-12 16:58:09 -0500 )edit

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answered 2018-01-12 17:23:07 -0500

bbrannon4's avatar

Sure, but I need some more details about your HVAC system. Regardless, the HVAC objects have a field to specify a profile/schedule that's being used for availability. Here is an example of a DX coil from one of the reference building models.

PSZ-AC:2_CoolC DXCoil,   !- Name
ALWAYS_ON,               !- Availability Schedule Name
AUTOSIZE,                !- Gross Rated Total Cooling Capacity {W}
AUTOSIZE,                !- Gross Rated Sensible Heat Ratio
3.66668442928701,        !- Gross Rated Cooling COP {W/W}
AUTOSIZE,                !- Rate

Here the third line references the ALWAYS_ON schedule, which in this model is defined as being 1 all the time. I suspect you will want something similar in your model, though where you put that depends on what type of HVAC system you have. Feel free to share your IDF file and I can try to be more specific, and confirm that this is your issue.

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Thanks a lot. I got it

mifg8's avatar mifg8  ( 2018-01-12 18:13:21 -0500 )edit

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Last updated: Jan 12 '18