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Consider a condenser for a room air conditioner that uses R-22 as the refrigerant. This heat...
oblem 1: An air conditioner based on the theoretical single-stage cycle is using Refrigerant- 134a as...
oblem 1: An air conditioner based on the theoretical single-stage cycle is using Refrigerant- 134a as the refrigerant operates with a condensing temperature of 100°F and evaporating temperature of 0°F. The air conditioner produces 5 tons of refrigeration. Determine: (a) The coefficient of performance of the cycle and the rate of refrigerant flow. (b) The condenser of the air conditioner is designed to reject the heat from the refrigerant. Air (Cp 0.24 Btu/lb. °F, p 0.077 lb/ft3) flows across the...
An air cooled automotive condenser is to transfer 5 kW to an air flow with velocity...
An air cooled automotive condenser is to transfer 5 kW to an air flow with velocity of 10 m/s entering at 30 oC and leaving at 34 oC. The heat transfer coefficient of R-134a is 400 W/m2 k. The tubes are copper and are 15mm I.D. and 17mm O.D. The evaporating temperature is 5 oC, and the condensing temperature is 40 oC. What is the required airside area? Kcopper= 390 W/m. k
can I please to have a clear handwritten answer of the above question, your help is...
can I please to have a clear handwritten answer of the
above question, your help is appreciated, thanks.
QUESTION 10- CONDENSERS AND EVAPORATORS 10.1 Explain how relative humidity in a cold room is effected and controlled by evaporator selection 10.2 An air-cooled condenser is to reject 70 kW of heat from the condensing refrigerant to air The condenser has an air-side area of 210 m2 and an overall heat transfer coefficient based on this area of 0,037 kW/m2K. It is...
Problem: The condenser in an air conditioning system is a heat exchanger in which cool air...
Problem: The condenser in an air conditioning system is a heat exchanger in which cool air absorbs latent energy from the refrigerant, condensing the refrigerant from vapor to liquid. Refrigerant R-134 enters the condenser at 1 MPa and 90°C. It leaves the condenser at 1 MPa and 30°C. Cool air enters the condenser at 100 kPa and 27°C at a volume flow rate of 10 m3/s, and it leaves at 95 kPa and 60°C. Assume the specific heat of the...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
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...
6-108 An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at...
6-108 An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 23C by rojece ing the waste heat to the outdoor air at 34'C. The room gains heat through the walls and the windows at a rate of 250 J/min while the heat generated by the computer, TV, and lights amounts to 900 W. The reſngcrant enters the com- pressor at 400 kPa as a saluralod vapor at a rate of 80 L/min and leaves...
Thin-walled aluminum tubes of diameter D = 10 mm are used in the condenser of an air conditioner....
Thin-walled aluminum tubes of diameter D = 10 mm are used in the condenser of an air conditioner. Under normal operating conditions, a convection coefficient of hi = 5000 W/m2 · K is associated with condensation on the inner surface of the tubes, while a coefficient of ho = 100 W/m2 · K is maintained by airflow over the tubes. a. What is the overall heat transfer coefficient if the tubes are unfinned? b. What is the overall heat transfer...
please solve this question using excel sheet (refrigeration systems) Q1): It is required to design a condenser that will be suitable for a refrigeration system that uses refrigerant 22 as the wo...
please solve this question using excel sheet (refrigeration
systems)
Q1): It is required to design a condenser that will be suitable for a refrigeration system that uses refrigerant 22 as the working fluid. The refrigeration system provides a refrigerating capacity of 50 kW for air conditioning purposes. At design conditions, the condensing temperature is 40°C while the evaporating temperature is 0°C. Cooling water enters the condenser at 25°C and leaves at 30°C. Design the condenser (calculate the required heat transfer...
Heat transfer 1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254...
Heat transfer
1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254 kg/s of 20°C water. The heat exchanger is a finned-tube cross flow heat exchanger with both sides unmixed. The overall heat transfer coefficient associated with the hot side is 120 W/(m2 °C). The hot-side area is 20 m². Assume a constant specific heat for air and water of Cecair = 1.005 kJ/(kg °C), Crewater = 4.2 kJ/(kg). The pressure of the hot air is...
oblem 1: An air conditioner based on the theoretical single-stage cycle is using Refrigerant- 134a as the refrigerant operates with a condensing temperature of 100°F and evaporating temperature of 0°F. The air conditioner produces 5 tons of refrigeration. Determine: (a) The coefficient of performance of the cycle and the rate of refrigerant flow. (b) The condenser of the air conditioner is designed to reject the heat from the refrigerant. Air (Cp 0.24 Btu/lb. °F, p 0.077 lb/ft3) flows across the...
can I please to have a clear handwritten answer of the
above question, your help is appreciated, thanks.
QUESTION 10- CONDENSERS AND EVAPORATORS 10.1 Explain how relative humidity in a cold room is effected and controlled by evaporator selection 10.2 An air-cooled condenser is to reject 70 kW of heat from the condensing refrigerant to air The condenser has an air-side area of 210 m2 and an overall heat transfer coefficient based on this area of 0,037 kW/m2K. It is...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
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...
6-108 An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 23C by rojece ing the waste heat to the outdoor air at 34'C. The room gains heat through the walls and the windows at a rate of 250 J/min while the heat generated by the computer, TV, and lights amounts to 900 W. The reſngcrant enters the com- pressor at 400 kPa as a saluralod vapor at a rate of 80 L/min and leaves...
please solve this question using excel sheet (refrigeration
systems)
Q1): It is required to design a condenser that will be suitable for a refrigeration system that uses refrigerant 22 as the working fluid. The refrigeration system provides a refrigerating capacity of 50 kW for air conditioning purposes. At design conditions, the condensing temperature is 40°C while the evaporating temperature is 0°C. Cooling water enters the condenser at 25°C and leaves at 30°C. Design the condenser (calculate the required heat transfer...
Heat transfer
1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254 kg/s of 20°C water. The heat exchanger is a finned-tube cross flow heat exchanger with both sides unmixed. The overall heat transfer coefficient associated with the hot side is 120 W/(m2 °C). The hot-side area is 20 m². Assume a constant specific heat for air and water of Cecair = 1.005 kJ/(kg °C), Crewater = 4.2 kJ/(kg). The pressure of the hot air is...
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