You created the CAPFT curve correctly. And you used the correct chiller
model since you have evaporator leaving water and condenser entering
water temps. The fundamental equations are similar in the respective
temperatures.
You should also create the EIRFT curve. You have both capacity and power
in the data set. Calculate EIR as Power/Capacity, both in Watts (W/W or
kW/kW). Then add this column to your spreadsheet (Actual EIR / Rated
EIR). Use the rated EIR (1/COP = 19.5/ 80 = 0.2437) to normalize the
data and also regress that data as you did before. Now you have 2 of the
3 curves.
What I would do next is to look at the chiller output (search rdd file
for "chiller" and find Chiller Evap Heat Trans Rate, Chiller Part Load
Ratio, and Chiller Cycling Ratio) and see if the data matches the
manufacturers data. Look for the evaporator leaving water temperature
and also the condenser leaving water temperature and see what the
capacity is. You will need to divide the evaporator heat transfer rate
(W) by the part-load ratio to get the actual operating capacity. If they
match, then this is a good model. This comparison only works when
Chiller Cycling Ratio = 1. Do the same for power.
If this all works well, then the only question is how well have you
modeled the old chiller. You now know how to answer that question.
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