So, does the ASHRAE interpretation IC 90.1-2007-14 imply that the "gpm" used in the calculation should be only the flow rate of the primary loop (or alternatively, only the secondary loop)? For example, if you have a CHW system with 500 gpm flow in the primary loop and 500 gpm flow in the secondary loop (they are only equal if the loop delta-t is equal), is the "gpm" in "22W/gpm" 500 gpm or 1000 gpm? I have not seen this explicitly defined anywhere.
Thanks,
Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
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