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[EnergyPlus_Support] Calculating On Demand Defrost for VRF
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Calculating On Demand Defrost for VRF
- From: "jameswilliamson3" <jameswilliamson3@xxxxxxxxx>
- Date: Fri, 19 Jul 2013 15:36:52 -0000
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I am trying to verify how E+ calculates on-demand Reverse-cycle defrost in the VRF module. The input-output reference says that "If on-demand defrost control is selected, the defrost time period is calculated based on outdoor weather (humidity ratio) conditions. However, I can't find an equation in the encyclopedia reference that describes how this time period is calculated. Page 922-923 of the encyclopedia explains equations for defrost heating capacity with time specified by the user but nothing for the on-demand calculated time period. Would anyone be able to explain to me how on-demand defrost is calculated? Thank you.
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