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OpenStudio VRF Total Heating/Cooling Rate VS Total Terminal Heating/Cooling Rate

asked 2015-06-11 13:14:52 -0500

Chuangye Guan gravatar image

updated 2015-07-11 13:09:49 -0500

I have created a model for a one story building with four thermal zones in OpenStudio 1.7.0. VRF is the only HVAC system of this building. The heat recovery mode is turn on and all other setting are as default. I tried to understand how the heat recovery affect the total heating/cooling energy so I look into the comparison between total terminal heating/cooling rate and VRF heat pump total heating/cooling rate in detailed output variable mode.

Based on the InputOutputReference, VRF Heat Pump Total Heating/Cooling Rate shall match the sum of the individual zone terminal unit output variable for Zone VRF Air Terminal Total Heating/Cooling Rate.

However, I found that wasn't true for my model. The VRF Heat Pump Total Heating/Cooling Rate isn't equal to the sum of the individual zone terminal unit output variable for Zone VRF Air Terminal Total Heating/Cooling Rate at each timestep. Have anyone seen this situation before? Please help me understand what is wrong with my model.

Thank you Chuangye

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were you able to figure out the issue?

rkbest gravatar image rkbest  ( 2015-07-23 14:17:29 -0500 )edit

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answered 2015-07-23 17:44:36 -0500

When heat recovery mode is NOT active, the total terminal unit capacity should equal the VRF total capacity. When heat recovery mode IS active, the operating mode is either cooling or heating. The terminal units operating in the active mode should equal the VRF (active mode) total capacity. If this is not the case please provide the input file.

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Asked: 2015-06-11 13:14:52 -0500

Seen: 210 times

Last updated: Jul 23 '15