Hi,
Maybe this tool will be helpful
On 6 Jul 2015, at 16:52, m.waseemahmad@xxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Hi,
I have been trying to create performance curve for a VRF system. I have followed Richard's paper to create them. I am misunderstanding the way extrapolation is done. The way I extrapolated is;1) Use Cooling capacity ration function for Low and high temperatures to predict CPFT (predicted) for all temperature range (e.g. -5C to -43C) for both these curves.2) Finding the intersection of these curves (or very close points) and taking that ODB (outdoor dry-bulb) as a boundary curve point for a particular indoor wet-bulb temperature. However, by doing this I don't have any discontinuity (as points do tend to nearly overlap/intersect).3) In order to plot boundary curve, I used cooling capacity ratio boundary curve to predicted ODB for each extrapolated IWB e.g. 5C, 10C IWB etc. Then, I used that predicted temperature to calculate predicted CPFT.Please see attached performance curve for cooling. The cubic curve does not even touch/intersect 35C and 5C IWB.I am making a mistake somewhere but don't know where. Any ideas?Thanks
<cooling_performance_curve.png>
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Posted by: Artem Zhukov <az141208@xxxxxxxxx>
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