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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Fill in the blank(s) with correct word

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Indicate whether the statement is true or false

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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?

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