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How to normalize experimental data to a performance curve?

asked 2019-07-12 18:06:54 -0500

mldichter gravatar image

Are there any examples of taking curve fitted experiment data for a DX coil and creating the normalized cooling capacity curve in energyplus? We are trying to do that as part of a research project, but we've clearly done something wrong since the simulation results are way off the experimental data.

Is the curve normalization procedure in any of the energyplus documentation? I was having trouble finding out how to do it.

Also, an example of normalizing a cooling capacity curve from real data would be awesome!

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answered 2019-07-15 07:22:25 -0500

This document describes the procedure to VRF DX equipment but the method is similar for any coil type that uses performance curves.

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@rraustad Are the rated conditions values in the energyplus documentation? At the very least, the code must contain the reference conditions because the curves are being evaluated at the rated conditions and output is checked to be 1.0 plus minus 10%.

mldichter gravatar imagemldichter ( 2019-07-16 11:49:55 -0500 )edit

19.44 C (67 F) indoor wet-bulb and 35 C (95 F) outdoor dry-bulb temperatures are typically used and called out in AHRI standards. I'm sure these are in the docs.

rraustad gravatar imagerraustad ( 2019-07-16 11:53:44 -0500 )edit

@rraustad You are correct! The cooling coils tend to have the test conditions values in the explanation of the curve field, but another good place to look is the related fields like COP which can have the test conditions values instead like in some of the heating coils documentation in the Input Output Reference.

mldichter gravatar imagemldichter ( 2019-07-16 12:01:27 -0500 )edit

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Asked: 2019-07-12 18:06:54 -0500

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