Question

a) Draw one example of heat engine cycle. In the drawing show clearly the heat and work interaction. [10 marks] b) Refrigerant 134a enters the evaporator coils placed inside the freezer section of a refrigerator at 60kPa with a quality of 20% and leaves at 60kPa and -20°C as shown in Fig. Q2(b). The compressor consumes 450W of power and the COP of the refrigerator is 1.2. Calculate the mass flow rate of the refrigerant and the heat rejected to the kitchen air Expansion valve $Q_H$ Condenser Evaporator 60kPa x = 0.2 60kPa $Q_L$ -20°C Fig. Q2(b) $W_m$ [13 marks]

          a) Draw one example of heat engine cycle. In the drawing show clearly the heat and work
interaction.
[10 marks]
b) Refrigerant 134a enters the evaporator coils placed inside the freezer section of a
refrigerator at 60kPa with a quality of 20% and leaves at 60kPa and -20°C as shown in
Fig. Q2(b). The compressor consumes 450W of power and the COP of the refrigerator
is 1.2. Calculate the mass flow rate of the refrigerant and the heat rejected to the kitchen
air
Expansion
valve
$Q_H$
Condenser
Evaporator
60kPa
x = 0.2
60kPa
$Q_L$ -20°C
Fig. Q2(b)
$W_m$
[13 marks]

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a) Draw one example of heat engine cycle. In the drawing show clearly the heat and work
interaction.
[10 marks]
b) Refrigerant 134a enters the evaporator coils placed inside the freezer section of a
refrigerator at 60kPa with a quality of 20% and leaves at 60kPa and -20°C as shown in
Fig. Q2(b). The compressor consumes 450W of power and the COP of the refrigerator
is 1.2. Calculate the mass flow rate of the refrigerant and the heat rejected to the kitchen
air
Expansion
valve
QH
Condenser
Evaporator
60kPa
x = 0.2
60kPa
QL -20°C
Fig. Q2(b)
Wm
[13 marks]

Added by Isabel D.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Varsha Aggarwal

Step 1

The Carnot cycle consists of four processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. In the drawing, we can represent the heat and work interactions as follows: - The heat input occurs during the isothermal Show more…

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a) Draw one example of a heat engine cycle. In the drawing, clearly show the heat and work interactions. [10 marks] b) Refrigerant 134a enters the evaporator coils placed inside the freezer section of a refrigerator at 60 kPa with a quality of 20% and leaves at 60 kPa and -20Â°C as shown in Fig. Q2(b). The compressor consumes 450 W of power, and the COP of the refrigerator is 1.2. Calculate the mass flow rate of the refrigerant and the heat rejected to the kitchen air. [13 marks] Condenser Expansion valve Evaporator 60 kPa x = 0.2 60 kPa -20Â°C Fig. Q2(b)

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