Question

Problem Statement. A steel bottle with a volume of 0.1-m^3 contains R-134a at 20°C and 200-kPa. It is placed in a deep freezer where it is cooled to -20°C. The freezer sits in a room with an ambient temperature of 20°C and has an inside temperature of -20°C. The internal energy of the R-134a before it is placed in the freezer is … -kJ/kg

173.65

323.99

395.27

985.53

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Question 124 pts

The mass of the R-134a in the bottle is … -kg

0.65

0.78

0.87

0.99

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Question 134 pts

The quality of the R-134a when it is at -20°C …

0.56

0.65

0.78

0.87

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Question 144 pts

The heat removed from the R-134a during the process is … -kJ

22.1

38.9

51.5

62.3

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Question 154 pts

The coefficient of performance for the freezer during the process is …

3.9

5.2

6.3

9.1

Answer 1