Re: [EnergyPlus_Support] HP Coefficient Calculator High Error

Subject: Re: [EnergyPlus_Support] HP Coefficient Calculator High Error

From: Chandan Sharma <csharma@xxxxxxxxxxxx>

Date: Thu, 26 Jan 2012 15:41:44 -0500

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Hi Luke,

In the "Catalog Data" tab, the data points must have varying inlet conditions which covers entire range of heat pump operation. There should be at least 6 data points and flow rates/temperatures columns must not be constant.
If the manufacturer has provided you correction factors to extend the performance data, it would help to generate more accurate coefficients. In general equation fit model is preferred over parameter estimation model and one of the reason is that curve fit coefficients are easier to calculate. Also, the curve fit model allows you to calculate coefficients for 410A.

"Rated..." values in the CoeffCalculator tab also affect the curve fit coefficients.

Hope this helps.
Chandan

On 1/26/2012 3:16 PM, luke_dorna wrote:

I am currently trying to generate the equation fit coefficients for a water to air heat pump cooling coil. Unfortunately, the waterair_pe_cooling.xls file seems to be giving me an incorrect result with average % of over 100.

Has anyone run into a situation like this? It looks like can get a better result from the parameter estimation method, however it does not support 410a, which is the refrigerant from the design.

Thanks,

Luke

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