During winter time a heat pump is operating on a heating mode to maintain a living...
During winter time a heat pump is operating on a heating mode to maintain a
living room at 23oC during which the outside temperature is -5oC. The system is
using R134a as a working fluid. The refrigerant leaves the condenser at 28oC and
enters a compressor at -10oC. The refrigerant flow rate is 0.12kg/s. Assume an
ideal VCC to evaluate the system and report the followings:
a. Process diagram
b. Heating capacity kJ/hr
c. Coefficient of performance of the system
d. Power required kW
e. Maximum COP based on a reversed carnot cycle
If the same system is used to maintain a spacious freezer at -5oC with an
outside temperature at 22oC.
f. What is the cooling capacity BTU/hr and tons of refrigeration.
g. Find coefficient of performance
h. What is the SEER rating
i. What is the monthly cost of running this freezer if the electrical tariff
is 50cent/Unit.
j. Provide Ts diagram for this cycle
k. Process diagram
Homework Answers
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During winter time a heat pump is operating on a heating mode to
maintain a
living...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34°C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat transfer...
A 20-ton industrial refrigeration system is used to maintain a freezer room at 20oF. The system...
A 20-ton industrial refrigeration system is used to maintain a freezer room at 20oF. The system uses R-22 refrigerant with evaporating temperature of 10oF and a condensing temperature of 100oF. The refrigerant enters the compressor at 20oF and exits the condenser at 85oF. Sketch the cycle on a p-h diagram and determine: a) The Carnot COP b) The compressor suction and discharge pressures in psig c) The refrigerant mass flow rate, lbs./h d) The specific volume of the refrigerant at...
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C....
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C. The wide temperature range is difficult to achieve with a single refrigerant, because the refrigerant will generally be at excessively high pressures at the top of the temperature range, and sub-atmospheric pressures at the bottom end The problem is solved with a 2-stage cascaded system that uses refrigerant 134a (R134a) and refrigerant 22 (R22) respectively for the high temperature...
Refrigerant 134a flows through an ideal vapor compression heat pump system with a heating capacity of...
Refrigerant 134a flows through an ideal vapor compression heat pump system with a heating capacity of 60,000 Btu/hr. The condenser operates at 200 psi, and the evaporator temperature is 0°F. The refrigerant is a saturated vapor at the evaporator exit and a saturated liquid at the condenser exit. The temperature at the compressor exit is 180°F. Assuming the compressor is not 100% isentropic, determine: a) Mass flow rate (lbm/min) b) Compressor power (hp) c) Isentropic compressor efficiency d) Coefficient of...
Refer to the illustration alongside of a proposed refrigeration system operating with R-134a
Refrigeration cycle Refer to the illustration alongside of a proposed refrigeration system operating with R-134a, the most widely used commercial and domestic refrigerant. R-134a enters the compressor at T1 = -16°C and x1 = 1.0. The volume flow rate is 1 m3/minute. The refrigerant leaves the condenser at T3 = 40°C and p3 = 1 MPa. 2.4. Calculate the “refrigeration capacity” (also called the “cooling load”). 2.5. Calculate the system's coefficient of performance (COP) and compare that to the COP of a Carnot-refrigerator....
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature a...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature at 21°C when the outside temperature is 0°C. A vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used to provide the necessary heating. The compressor operates adiabatically with an isentropic efficiency of 82%. Specify appropriate evaporator and condenser pressures of a cycle for this purpose assuming Δ1cond-Al evap-10°C, as shown below. The states are numbered as shown below....
The heat-pump system shown is designed to provide water-heating and space-cooling. The system includes a heat...
The heat-pump system shown is designed to provide water-heating and space-cooling. The system includes a heat exchanger to subcool the R134a refrigerant at the outlet of the water heater while heating the refrigerant at the outlet of the evaporator. Given the following data, determine the enthalpy at each station, 1 through 6, using the R134a property tables (click here). Type your answers hy through h6 in the space provided below, and show all your work on your paper. · At...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C in winter and consumes 8 kW of power (electricity) when operating. On a day temperature outside the house is -3 °C, the house is estimated to lose heat at an average rate of 80,000 kJ/h. (Sa). (2p) Please identify the hot reservoir and the cool reservoir of this heat pump. (5b). (2p) Please draw of schematic diagram of this heat pump-house heating system with...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34°C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat transfer...
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C. The wide temperature range is difficult to achieve with a single refrigerant, because the refrigerant will generally be at excessively high pressures at the top of the temperature range, and sub-atmospheric pressures at the bottom end The problem is solved with a 2-stage cascaded system that uses refrigerant 134a (R134a) and refrigerant 22 (R22) respectively for the high temperature...
Refrigerant 134a flows through an ideal vapor compression heat pump system with a heating capacity of 60,000 Btu/hr. The condenser operates at 200 psi, and the evaporator temperature is 0°F. The refrigerant is a saturated vapor at the evaporator exit and a saturated liquid at the condenser exit. The temperature at the compressor exit is 180°F. Assuming the compressor is not 100% isentropic, determine: a) Mass flow rate (lbm/min) b) Compressor power (hp) c) Isentropic compressor efficiency d) Coefficient of...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature at 21°C when the outside temperature is 0°C. A vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used to provide the necessary heating. The compressor operates adiabatically with an isentropic efficiency of 82%. Specify appropriate evaporator and condenser pressures of a cycle for this purpose assuming Δ1cond-Al evap-10°C, as shown below. The states are numbered as shown below....
The heat-pump system shown is designed to provide water-heating and space-cooling. The system includes a heat exchanger to subcool the R134a refrigerant at the outlet of the water heater while heating the refrigerant at the outlet of the evaporator. Given the following data, determine the enthalpy at each station, 1 through 6, using the R134a property tables (click here). Type your answers hy through h6 in the space provided below, and show all your work on your paper. · At...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C in winter and consumes 8 kW of power (electricity) when operating. On a day temperature outside the house is -3 °C, the house is estimated to lose heat at an average rate of 80,000 kJ/h. (Sa). (2p) Please identify the hot reservoir and the cool reservoir of this heat pump. (5b). (2p) Please draw of schematic diagram of this heat pump-house heating system with...
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