13-3 A refrigerant 22 refrigerating system operates with a condensing temperature of 35°C and an evaporating temperature of -10°C. If the vapor leaves the evaporator saturated and is compressed isentropically, what is the COP of the cycle (a) if saturated liquid enters the expansion device and (b) if the refrigerant entering the expansion de- vice is 10 percent vapor as in Fig. 13-3? Ans. (a) 4.71, (b) 4.20 13-4 Refrigerant 22 at a pressure of 1500 kPa leaves the condenser and rises vertically

Elements Of Electromagnetics
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Subject: Refrigeration Systems
Course: Mechanical Engineering
Reference Book : Stoecker and Jones, Refrigeration and Air Conditioning

13-3 A refrigerant 22 refrigerating system operates with a condensing temperature of
35°C and an evaporating temperature of -10°C. If the vapor leaves the evaporator
saturated and is compressed isentropically, what is the COP of the cycle (a) if saturated
liquid enters the expansion device and (b) if the refrigerant entering the expansion de-
vice is 10 percent vapor as in Fig. 13-3? Ans. (a) 4.71, (b) 4.20
13-4 Refrigerant 22 at a pressure of 1500 kPa leaves the condenser and rises vertically
10 m to the expansion valve. The pressure drop due to friction in the liquid line is
20 kPa. In order to have no vapor in the refrigerant entering the expansion valve, what
is the maximum allowable temperature at that point? Ans. 35.3°C
Transcribed Image Text:13-3 A refrigerant 22 refrigerating system operates with a condensing temperature of 35°C and an evaporating temperature of -10°C. If the vapor leaves the evaporator saturated and is compressed isentropically, what is the COP of the cycle (a) if saturated liquid enters the expansion device and (b) if the refrigerant entering the expansion de- vice is 10 percent vapor as in Fig. 13-3? Ans. (a) 4.71, (b) 4.20 13-4 Refrigerant 22 at a pressure of 1500 kPa leaves the condenser and rises vertically 10 m to the expansion valve. The pressure drop due to friction in the liquid line is 20 kPa. In order to have no vapor in the refrigerant entering the expansion valve, what is the maximum allowable temperature at that point? Ans. 35.3°C
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