Problem with HeatExchanger:AirToAir:SensibleAndLatent

asked 2018-11-20 08:21:13 -0500

kenny.c
177 ●5

updated 2018-11-20 08:35:55 -0500

I’m modelling a centralized AHU with heating coil, cooling coil and a heat exchanger in EnergyPlus. My total ventilation rate is 0,3867 m³/s (CAV) for 15 zones. I think there’s something wrong with my heat exchanger (HeatExchanger:AirToAir:SensibleAndLatent) but I don’t know what exactly. When I turn off my heating coil, cooling coil and heat exchanger, the air temperature of the ventilation into the room is slightly above the outdoor drybulb (which is normal). But when I turn on the heat exchanger (while the heating and cooling coils remain off), the air temperature of the ventilation is 20-24°C with an average outdoor drybulb of 5°C. The Sensible Effectiveness of my heat exchanger is 0,85 so normally it should not be possible to heat the air supply temperature from an outside temperature of 5°C to an inside air temperature of 24°C. Am I overlooking something? Thank in advance!

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Also is the effectiveness and efficiency of the heat exchanger the same or is it something different in EnergyPlus?

kenny.c ( 2018-11-21 07:53:10 -0500 )edit

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Output:Variable,*,System Node Temperature,hourly; !- HVAC Average [C] Output:Variable,*,System Node Mass Flow Rate,hourly; !- HVAC Average [kg/s] Output:Variable,*,System Node Humidity Ratio,hourly; !- HVAC Average [kgWater/kgDryAir]

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