Where can I find more info on HeatPump:WaterToWater:EquationFit performance inputs?

asked 2020-02-18 08:00:37 -0600

updated 2020-03-08 12:55:59 -0600

I am trying to adjust the heating and cooling performance of a GSHP using the HeatPump:WaterToWater:EquationFit Heating and Cooling objects and I have the following questions:

  1. What conditions does energyplus assume the reference properties are measured at?
  2. What sort of capacity curve do these objects follow? Unlike other conventional chiller/heat pump objects, the coefficients are properties defined within the object itself (whereas in the other case, a separately-defined curve object, bi-quadratic, bi-cubic, etc... is referenced). The Input/Output Reference document suggests checking the Engineering Reference document; however this document doesn't seem to explicitly describe the type of curve found in these HeatPump:WaterToWater:EquationFit objects.

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My hope/working assumption has been that the reference conditions are (whenever possible) consistent with the test methods cited in ASHRAE 90.1. I understand that for certain objects (for example water-to-water heat pumps) which can be connected to different types of heat rejection loops, some concession must have been made.

jbatt's avatar jbatt  ( 2020-02-18 08:56:10 -0600 )edit