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[EnergyPlus_Support] air to air heat exchanger


I have an air to air heat exchanger, which transfer sensible and 
latent heat between the outside air and building relief air. When I 
output its heat recovery energy, lots of nagative numbers happen in 
summer, while in winter, most are positive numbers.

In my opinion, there should not be any nagative number. When the 
relief air enthalpy is greater than outside air enthalpy, the heat 
exchanger should be turned off. Is it correct?

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