Homework Answers
5. A commercial refrigerator uses 134a refrigerant to keep the space refrigerated at −30 ° C...
5. A commercial refrigerator uses 134a refrigerant to keep the space refrigerated at −30 ° C by rejecting its waste heat into cooling water entering the condenser at 101,325 kPa, at the rate of 0.25 kg / s. The refrigerant is fed to the compressor at -25 ° C and 100 kPa. Use a software and determine the quality of the refrigerant at the inlet of the evaporator and the COP of the refrigerator using the conditions shown in the...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20°...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20° C, and exits at 1 MPa and 60° C. The refrigerant is cooled to 35° C in the condenser and then expands back to 100 kPa through an expansion valve. Neglect pressure losses within the condenser and evaporator. The refrigerant flow rate is 0.10 kg/s. Calculate the following a) the rate of heat removal from the cooled space, in kw, b) the rate of...
Problem #4 (20 points) A commercial refrigerator with refrigerant-134a as the working fluid is used to...
Problem #4 (20 points) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and-34°Cand the compressor is estimated to gain a net heat of...
Problem #3 Refrigerant R-134a enters the condenser of a heat pump at 1000 kPa and 80°C...
Problem #3 Refrigerant R-134a enters the condenser of a heat pump at 1000 kPa and 80°C at a rate of 0.025 kg/s and leaves at 1000 kPa as saturated liquid. If the compressor consumes 2 kW of power, determine: a) The COP of the heat pump (as heating device). b) The rate of heat absorption from the outside air. тан Condenser Throttling valve Compressor Evaporator To
value 10.00 points Question An air-conditioner with refrigerant-134a s the working fluid is used to keep...
value 10.00 points Question An air-conditioner with refrigerant-134a s the working fluid is used to keep a room at 21°C-Ass by rejecting the waste heat to the outdoor air at 37°C. The room gains heat through the walls and the windows at a rate of 249 kJ/min while the heat generated by the computer, TV, and T lights amounts to 600 W. The refrigerant enters the compressor at 360 kPa as a saturatedV vapor at a rate of 100 L/min...
1) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated...
1) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 16 °C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of...
120; = ? 2 (P2 = 1000 kPa; T2 = 65 °C) Problem 5. A compression...
120; = ? 2 (P2 = 1000 kPa; T2 = 65 °C) Problem 5. A compression refrigeration cycle (see Figure) has R-134a as the refrigerant. The mass flow rate is 3 kg/min. The refrigerant goes through isothermal evaporation in the evaporator and leaves the evaporator at -20 °C as saturated vapor. It enters the condenser with a pressure of 1 MPa and a temperature of 65 °C. Assume no losses in the pipelines connecting different components. Also assume steady state...
QUESTION 4 (15 marks) Below is a schematic of a car air conditioning system that uses...
QUESTION 4 (15 marks) Below is a schematic of a car air conditioning system that uses R-134a as its refrigerant. Here we will analyze the system under the case of driving through a very hot environment of 40 °C. The interior of the car is kept at 20 °C. Refrigerant leaves the compressor at 1.6 MPa absolute and leaves the condenser as a saturated liquid. The evaporator operates at 400 kPa absolute and the refrigerant leaves as a saturated vapour....
thermodynamics Page 5 of 12 Problem 3 (SS pts): The following figure provides the schematic o using Refrigerant 134a as the working fluid to keep a ro the outdoor air at 34 "C. The refrigeran...
thermodynamics
Page 5 of 12 Problem 3 (SS pts): The following figure provides the schematic o using Refrigerant 134a as the working fluid to keep a ro the outdoor air at 34 "C. The refrigerant enters the co leaves dhe rate of O.06 m steady site compressor at 320 kPa as a satwrated vapor w a saturated liquid. Assume there is no pressure drop in the eo stray heat transfer for the compressor the valve, leaves at 1 refrigerant leaves...
PLEASE ANSWER QUICKLY!! I WILL THUMBS UP! Thank you so much in advance!! Neatly sketch the...
PLEASE ANSWER QUICKLY!! I WILL THUMBS UP! Thank you so much in
advance!!
Neatly sketch the complete heat-pump cycle from Question 1 on a P-h diagram, showing clearly all six processes (1) - (2) - (3) - (4) - (5) - (6)-(1). If you have a printer available, you may print this PDF file of the R134a P-h diagram. Otherwise, draw a very neat scale copy of the P-h diagram shown below. You do not have to type any response...
5. A commercial refrigerator uses 134a refrigerant to keep the space refrigerated at −30 ° C by rejecting its waste heat into cooling water entering the condenser at 101,325 kPa, at the rate of 0.25 kg / s. The refrigerant is fed to the compressor at -25 ° C and 100 kPa. Use a software and determine the quality of the refrigerant at the inlet of the evaporator and the COP of the refrigerator using the conditions shown in the...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20° C, and exits at 1 MPa and 60° C. The refrigerant is cooled to 35° C in the condenser and then expands back to 100 kPa through an expansion valve. Neglect pressure losses within the condenser and evaporator. The refrigerant flow rate is 0.10 kg/s. Calculate the following a) the rate of heat removal from the cooled space, in kw, b) the rate of...
Problem #4 (20 points) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and-34°Cand the compressor is estimated to gain a net heat of...
Problem #3 Refrigerant R-134a enters the condenser of a heat pump at 1000 kPa and 80°C at a rate of 0.025 kg/s and leaves at 1000 kPa as saturated liquid. If the compressor consumes 2 kW of power, determine: a) The COP of the heat pump (as heating device). b) The rate of heat absorption from the outside air. тан Condenser Throttling valve Compressor Evaporator To
value 10.00 points Question An air-conditioner with refrigerant-134a s the working fluid is used to keep a room at 21°C-Ass by rejecting the waste heat to the outdoor air at 37°C. The room gains heat through the walls and the windows at a rate of 249 kJ/min while the heat generated by the computer, TV, and T lights amounts to 600 W. The refrigerant enters the compressor at 360 kPa as a saturatedV vapor at a rate of 100 L/min...
1) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 16 °C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of...
120; = ? 2 (P2 = 1000 kPa; T2 = 65 °C) Problem 5. A compression refrigeration cycle (see Figure) has R-134a as the refrigerant. The mass flow rate is 3 kg/min. The refrigerant goes through isothermal evaporation in the evaporator and leaves the evaporator at -20 °C as saturated vapor. It enters the condenser with a pressure of 1 MPa and a temperature of 65 °C. Assume no losses in the pipelines connecting different components. Also assume steady state...
QUESTION 4 (15 marks) Below is a schematic of a car air conditioning system that uses R-134a as its refrigerant. Here we will analyze the system under the case of driving through a very hot environment of 40 °C. The interior of the car is kept at 20 °C. Refrigerant leaves the compressor at 1.6 MPa absolute and leaves the condenser as a saturated liquid. The evaporator operates at 400 kPa absolute and the refrigerant leaves as a saturated vapour....
thermodynamics
Page 5 of 12 Problem 3 (SS pts): The following figure provides the schematic o using Refrigerant 134a as the working fluid to keep a ro the outdoor air at 34 "C. The refrigerant enters the co leaves dhe rate of O.06 m steady site compressor at 320 kPa as a satwrated vapor w a saturated liquid. Assume there is no pressure drop in the eo stray heat transfer for the compressor the valve, leaves at 1 refrigerant leaves...
PLEASE ANSWER QUICKLY!! I WILL THUMBS UP! Thank you so much in
advance!!
Neatly sketch the complete heat-pump cycle from Question 1 on a P-h diagram, showing clearly all six processes (1) - (2) - (3) - (4) - (5) - (6)-(1). If you have a printer available, you may print this PDF file of the R134a P-h diagram. Otherwise, draw a very neat scale copy of the P-h diagram shown below. You do not have to type any response...
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