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Re: [EnergyPlus_Support] Air handler Heating coil operates in the summer

Sounds like the cooling coil is operating to overcome the cooling load 
and the supply air fan heat.

Where are you setting your setpoint temperatures?  At the outlet of the 
cooling and heating nodes?  What type of setpoint managers are you using?

JV Dirkes II wrote:
> Dear EPlus Forum,
>
> My model has an air loop with a single branch as shown below.  The
> heating and cooling coils are both set to:
> a) use a constant 55F / 12.8C discharge temperature,
> b) measured at the identical node (the outlet node for the AHU).
>
> During the summer design day operating hours, the temperature leaving
> the cooling coil is a few tenths of a degree C below what is needed,
> so the heating coil operates to boost the temp.  This, of course,
> causes additional energy use.  What causes it and how can I elimimate it?
>
> Thanks in advance!
>
> BRANCH,
> Branch_AirLoop_AH1,
> 11.3268,
> OUTSIDE AIR SYSTEM,
> OASystem_AH1,
> NodeIn_RA_AH1,
> NodeOut_MA_AH1,
> PASSIVE,
> COIL:WATER:COOLING,
> ClgCoil_AH1,
> NodeOut_MA_AH1,
> NodeOut_ClgCoilAir_AH1,
> PASSIVE,
> COIL:GAS:HEATING,
> HtgCoil_AH1,
> NodeOut_ClgCoilAir_AH1,
> NodeOut_HtgCoilAir_AH1,
> PASSIVE,
> FAN:SIMPLE:CONSTVOLUME,
> SFan_AH1,
> NodeOut_HtgCoilAir_AH1,
> NodeOut_Air_AH1,
> ACTIVE;
>   

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