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Re: [EnergyPlus_Support] GSHP Parameter coefficient generator



I think the basic answer is that you want the data to cover the spectrum of operation for that component during the simulation.  The curve fit will fit best within the data provided.  Extrapolation from that data may result in inaccuracies.  

The input to the utility requires that each input must vary.  If a constant is given for entering air temperature throughout your data points, without any variation, a curve fit won't really make sense, and the spreadsheet tool may give non-sensible answers. 

A more advanced tool is currently under development which will allow the user to easily enter the tabulated data as found in a heat pump data sheet along with the correction factors which are also found.  This is used to develop a large dataset which will then result in a good quality curve fit.  For the spreadsheet the user must apply these manually.

Edwin

On Wed, Jun 3, 2009 at 4:57 PM, Alan Jackson <alanjackson7@xxxxxxxxx> wrote:


This is my first go around at modeling a GSHP in Energyplus and I am going through the documentation for the parameter-coefficient generator spreadsheet and needed some feedback. I have all the manufacturer information as far as performance values. My question relates to the amount of data required.

The user manual states "The data points must have varying inlet conditions (e.g. water flow rates, inlet water temperatures, etc.) that covers the entire range of the heat pump operating conditions."

When they say "covers the entire range" doe s this mean we would need to enter both part load and full load conditions? or is it possible to get useful outputs with varying temperatures at full load ratings?

I think I already know the answer to this but looking for some confirmation.

Thanks

-
aj




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