For a low-temperature refrigeration system with an evaporator saturation temperature of -40°F, why might R-502 be used instead of R-12?
What will be an ideal response?
R-502 would keep the suction pressure positive (above atmospheric pressure), while and R-12 system would operate with the suction pressure in a vacuum (below atmospheric pressure).
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What unit of measurement expresses the number of times a vibration occurs in one second?
What will be an ideal response?