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RE: [EnergyPlus_Support] Re: Many coils in one AHU


I am not aware that E+ can model hot gas reheat directly.  I have dealt with this in the past by defining an electric heating coil instead of a DX heating coil. The temperature and humidity controls use the electric coil for both temperature and reheating / humidity control.  I also report the hourly cooling and heating loads as output:variables.

In a post-process (spreadsheet), I determine:

·         If cooling load >0 (i.e., the coil is ON), hot gas energy = min(cooling load, heating load, electric coil capacity)

·         The electric coil capacity = DX cooling coil capacity* (1 + 1/COP)  This accounts for compressor heat.  If you want to be more precise, you can derive using the hourly EIR instead of a constant COP.

·         Hot gas energy is then deducted from total heating electric energy

·         A little messy, but not too bad!


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