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MMLU-Pro / 11751 / Refrigerant 12 (Freon 12) at 20 psia and 30°F is compressed to 140 psia and…

Problem

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question

Refrigerant 12 (Freon 12) at 20 psia and 30°F is compressed to 140 psia and 150°F during a compression stroke. For a pound of this refrigerant (a) calculate the work done during compression, (b) the heat removed during compression.

category

engineering

options

  1. Work done during compression is -140 psia, heat removed during compression is -150 Btu/lb
  2. Work done during compression is 11,670 ft-lb, heat removed during compression is 2.059 Btu/lb
  3. Work done during compression is 11,670 ft-lb, heat removed during compression is -11,670 Btu/lb
  4. Work done during compression is -11,670 ft-lb, heat removed during compression is -2.059 Btu/lb
  5. Work done during compression is 140 psia, heat removed during compression is 30 Btu/lb
  6. Work done during compression is -2.059 ft-lb, heat removed during compression is -11,670 Btu/lb
  7. Work done during compression is -20 psia, heat removed during compression is 150 Btu/lb
  8. Work done during compression is 20 ft-lb, heat removed during compression is -30 Btu/lb
  9. Work done during compression is 2.059 ft-lb, heat removed during compression is 11,670 Btu/lb
  10. Work done during compression is -11,670 ft-lb, heat removed during compression is 2.059 Btu/lb

src

stemez-Thermodynamics

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