Exercise 6.1 (20%) Refrigerant R-134a at 700 kPa and 70°C (condition 1) is cooled/condensed at constant pressure using cooling water in a condenser (heat exchanger). The refrigerant (R-134a) flows out of the condenser at 6.69°C subcooled at 700 kPa (state 2). The conditions of the cooling water at the inlet and outlet of the heat exchanger are 150 kPa, 15°C (condition 3) and 150 kPa, 25°C (condition 4). The mass flow of the cooling water is 10 kg/min a) Draw a sketch of the device (remember to put numbers for conditions and relate to these in your use of symbols) and calculate the mass flow of refrigerant R-134a in kg/min. b) How much heat power is transferred between the fluids in kW? Exercise 6.2 (30%) Subcooled water first flows through an adiabatic choke valve and then into an adiabatic separator. Before the throttle valve, the water is at 5 MPa and 180°C and the mass flow is 200 kg/s. The throttle valve reduces the pressure to 300 kPa. This is also the pressure in the mass flows of steam and liquid out of the separator. a) Draw a sketch of the facility (remember to put numbers for conditions and relate to these in your use of symbols) and calculate the total volume flow of the water at the inlet to the throttle valve in m3/s. b) What is the temperature (°C) and steam quality of the water immediately after the throttle valve (before the inlet to the separator)? c) What are the mass flows of the liquid phase and the gas phase out of the separator in kg/s? d) The steam flow is expanded in an adiabatic turbine to 50 kPa and steam quality of 0.92. How much power does the turbine deliver in kW or MW?
Exercise 6.1 (20%) Refrigerant R-134a at 700 kPa and 70°C (condition 1) is cooled/condensed at constant pressure using cooling water in a condenser (heat exchanger). The refrigerant (R-134a) flows out of the condenser at 6.69°C subcooled at 700 kPa (state 2). The conditions of the cooling water at the inlet and outlet of the heat exchanger are 150 kPa, 15°C (condition 3) and 150 kPa, 25°C (condition 4). The mass flow of the cooling water is 10 kg/min a) Draw a sketch of the device (remember to put numbers for conditions and relate to these in your use of symbols) and calculate the mass flow of refrigerant R-134a in kg/min. b) How much heat power is transferred between the fluids in kW? Exercise 6.2 (30%) Subcooled water first flows through an adiabatic choke valve and then into an adiabatic separator. Before the throttle valve, the water is at 5 MPa and 180°C and the mass flow is 200 kg/s. The throttle valve reduces the pressure to 300 kPa. This is also the pressure in the mass flows of steam and liquid out of the separator. a) Draw a sketch of the facility (remember to put numbers for conditions and relate to these in your use of symbols) and calculate the total volume flow of the water at the inlet to the throttle valve in m3/s. b) What is the temperature (°C) and steam quality of the water immediately after the throttle valve (before the inlet to the separator)? c) What are the mass flows of the liquid phase and the gas phase out of the separator in kg/s? d) The steam flow is expanded in an adiabatic turbine to 50 kPa and steam quality of 0.92. How much power does the turbine deliver in kW or MW?
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter45: Domestic Refrigerators And Freezers
Section: Chapter Questions
Problem 13RQ: Condensers in these refrigerators are all_______cooled.
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Transcribed Image Text:Exercise 6.1
(20%) Refrigerant R-134a at 700 kPa and 70°C (condition 1) is cooled/condensed at constant pressure using cooling water
in a condenser (heat exchanger). The refrigerant (R-134a) flows out of the condenser at 6.69°C subcooled at 700 kPa (state
2). The conditions of the cooling water at the inlet and outlet of the heat exchanger are 150 kPa, 15°C (condition 3) and 150
kPa, 25°C (condition 4).
The mass flow of the cooling water is 10 kg/min
a) Draw a sketch of the device (remember to put numbers for conditions and relate to these in your use of symbols)
and calculate the mass flow of refrigerant R-134a in kg/min.
b) How much heat power is transferred between the fluids in kW?
Exercise 6.2
(30%) Subcooled water first flows through an adiabatic choke valve and then into an adiabatic separator. Before the throttle
valve, the water is at 5 MPa and 180°C and the mass flow is 200 kg/s.
The throttle valve reduces the pressure to 300 kPa. This is also the pressure in the mass flows of steam and liquid out of
the separator.
a) Draw a sketch of the facility (remember to put numbers for conditions and relate to these in your use of symbols) and
calculate the total volume flow of the water at the inlet to
the throttle valve in m3/s.
b) What is the temperature (°C) and steam quality of the water immediately after the throttle valve (before the inlet to
the separator)?
c) What are the mass flows of the liquid phase and the gas phase out of the separator in kg/s?
d) The steam flow is expanded in an adiabatic turbine to 50 kPa and steam quality of 0.92. How much power does the
turbine deliver in kW or MW?
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