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What compressor arrangement is the best to refrigerate a space to a temperature below - 150?
Usually
r-717 is refrigerant used here but not always. And a cascade system is most likely used to keep the coefficient of performance hi and compressor life long.
Cascade system simply means the very low low density gas coming from the low-side of the evaporator goes into a high volume compression system first then into another lower volume compressor keeping both within a reasonable coefficient of performance and temperature operating level.
Much like a turbo charger on a automobile if you will imagine that.
Hope this helps:
Jimiwane
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