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Hi,
hopefully this question will be a little more challenging
than the one I sent about electric meters - I figured out the answer to
that one about 2 minutes after sending the question.
I am trying to model supermarket
refrigeration.
The store has three separate compressor rack systems, and
4 packaged single zone units. I am planning to assign one compressor rack
to each of three of the four PSZ units. Two of the rack systems have
multiple suction temperatures, so I will specify the evaporator capacity and EER
at each temperature.
The area that I need a little assistance with is the
performance curves. Does PowerDOE assume that the compressors' kW is the
evaporator capacity divided by the EER? Does it then multiply this kW by
the output of the curve fits for compressor kW as a function of condensing
temperature and part load ratio? What factors determine part load
ratio for the compressors?
How do you specify interaction between the refrigeration
cases and the conditioned space in the store? (The cooling effect that the
cases have in the space, and the effect of space humidity and temperature on the
case load)
Thanks
Alec
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