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An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF (-28.9oC) and a quality of 95%. The compressor discharges at a pressure of 100 psi (689.5 kPa), liquid ammonia leaves condenser at 50oF (10oC). Properties of Ammonia:   At 689.6 kPa (Tsat = 13.3oC)      h = 1,568 kJ/kg; s = 5.7676 kJ/kg.K   At 10oC:      hf = 246.531 kJ/kg   At -28.9oC by interpolation      hf = 68.5 kJ/kg; hg = 1424.5 kJ/kg             sf = 0.49366; sg = 6.0452 Find the heat rejected by the evaporator in kJ/kg.

An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF (-28.9oC) and a quality of 95%. The compressor discharges at a pressure of 100 psi (689.5 kPa), liquid ammonia leaves condenser at 50oF (10oC). Properties of Ammonia:   At 689.6 kPa (Tsat = 13.3oC)      h = 1,568 kJ/kg; s = 5.7676 kJ/kg.K   At 10oC:      hf = 246.531 kJ/kg   At -28.9oC by interpolation      hf = 68.5 kJ/kg; hg = 1424.5 kJ/kg             sf = 0.49366; sg = 6.0452 Find the heat rejected by the evaporator in kJ/kg.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF (-28.9oC) and a quality of 95%. The compressor discharges at a pressure of 100 psi (689.5 kPa), liquid ammonia leaves condenser at 50oF (10oC).

Properties of Ammonia:

  At 689.6 kPa (Tsat = 13.3oC)

     h = 1,568 kJ/kg; s = 5.7676 kJ/kg.K

  At 10oC:

     hf = 246.531 kJ/kg

  At -28.9oC by interpolation

     hf = 68.5 kJ/kg; hg = 1424.5 kJ/kg

            sf = 0.49366; sg = 6.0452

Find the heat rejected by the evaporator in kJ/kg.

a.

1,356.5

b.

1,568.5

c.

1,321.5

d.

1,125.5

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