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Correct way to interpret the water-to-air heat pump performace data
I am involved with a project that is about numerical modeling of performance of a ground heat exchanger (or mistakenly called geothermal) attached to a water-to-air heat pump. In my model, I need to have a relatively accurate estimate of the following parameters:
1- Heating and cooling loads
2- Air flow rate
3- Fluid flow rate
4- Heating and cooling power requirement
1. I wanted to know if it is a reasonable assumption to say that there is a linear relationship between the HP tonnage and all the above parameters? The reason I am asking is because I need to be able to give the software a range of different HP tonnage and subsequently a range of operating parameters that results from selection of a bigger or smaller pump. So, I need some sort of automatic reasonable data input to approximate the vicinity of each of the above parameters.
2. My main issue is with sample performance data reported online. I don't seem to be able to make sense out of the HP Power requirements for each unit. I have copied the link to the performance data that I am looking at. I am concerned with the horizontal ground source data reported on page 26 of the manual as well as the related electrical data on page 49 for standard static motor.
First of all, is the WATTS column the power requirement of the system? If yes, then why the ration of cooling/heating capacities to the WATTS does not equal COP in units larger than 009? Then, looking at page 49 for electrical data, I assume Watts=V (voltage)*I(amperes) to compare the results to the WATTS reported in ISO standard condition. The reported WATTS in table on page 26 are much higher than the wattage that I calculate from the voltage and amperage data?!
Where am I getting this wrong? What is the correct power requirement for each unit, the one in the table right next to the capacity or the product of voltage and amperage? Why the COP calculation=Capacity/HP power does not give the reported COP values in heating and cooling?!!
Appreciate your help. I am new to the HVAC world.