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Determining "Equivalent Piping Length used for Piping Correction Factor" for VRF

asked 2017-08-07 13:10:18 -0500

pajordan gravatar image

updated 2017-08-07 15:51:50 -0500

When entering VRF inputs in an OpenStudio model, there are equivalent length inputs used to estimate piping losses.

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Does the "Equivalent Piping Length in Cooling Mode" represent the length of the farthest terminal unit from the outdoor unit and should this typically be equal to the "Equivalent Piping Length use for Piping Correction Factor in Heating Mode"?

The Engineering Reference documentation gives a definition of the equivalent length in the heating mode section; I didn't see it in the cooling mode section but I'm assuming it's meant to represent the same thing (i.e., piping length to the farthest terminal unit).

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answered 2017-08-07 13:39:20 -0500

You are correct in that this input is meant to represent the farthest terminal unit and therefore the expected piping losses.

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Great - thank you for the confirmation.

pajordan gravatar image pajordan  ( 2017-08-07 13:49:16 -0500 )edit

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Asked: 2017-08-07 13:10:18 -0500

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Last updated: Aug 07 '17