A refrigeration system has an estimated COP of 2.0. It absorbs heat from a refrigerated space at 490R at rate of 500 Btu/min. The system uses water-cooled condenser for rejecting the waste heat and the water at 80 lbm/min (specific heat is 1.0 Btu/lbm-F) has an inlet temperature of the condenser is 530F. Calculate the power input to the system in hp, and the maximum possible COP of the system.

A refrigeration system has an estimated COP of 2.0. It absorbs heat from a refrigerated space at 490R at rate of 500 Btu/min. The system uses water-cooled condenser for rejecting the waste heat and the water at 80 lbm/min (specific heat is 1.0 Btu/lbm-F) has an inlet temperature of the condenser is 530F. Calculate the power input to the system in hp, and the maximum possible COP of the system.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

See similar textbooks

Similar questions

Why is two-stage compression popular for extra-low-temperature refrigeration systems?
The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40F
Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop systems.
Condensers in these refrigerators are all_______cooled.
A refrigeration system using R-12 receives a load of 54 KW at an evaporator temperature of - 4 oC and a condenser temperature of 42 oC.Determine:a. Calculate the power required by the compressor in KW. b. If a liquid to suction heat exchanger is to be installed henceforth superheating the vapor refrigerant by 10 oC upon entering the compressor, what is the COP?
A vapor compression cycle with R-134a is being used as its refrigerant. The refrigerant leaves the evaporator at -10 C and 120 kPa and it enters the condenser 1.0 MPa. Assuming there is a heat loss due to compression which is equal to 20 kJ/kg, and it has a cooling capacity of 75 tons of refrigeration, Determine the following: (a)heat rejected (b)cooling effect (c)work of compression (d) coefficient of performance (e)volume flow rate of refrigerant (f)compressor discharge temperature
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting waste heat to cooling water that enters the condenser at 20°C at a rate of 0.25 kg/s and leaves at 28°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. If the Talking PIYATIDA TENURUK compressor consumes 3.7 kW of power, determine (a) the mass flow rate of the refrigerant (b) the refrigeration load (c) the COP (d) the minimum power input to the compressor for the same refrigeration load
A two-evaporator, multiple EV,and multiple compression refrigeration system uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 0°C, evaporator 2 at -26.4°C, and the condenser at 800kPa. The refrigerant is circulated through the compressor at a rate of 0.1kg/s and the low temperature evaporator serves a cooling load of 8 kW.Determine the cooling rate of the high-temperature evaporator, the power required by the compressor, and the COP of the system. The refrigerant is saturated liquid at the exit of the condenser and saturated vapor at the exit of each evaporator, and the compressor is isentropic.
A two-evaporator, multiple EV,and single compression refrigeration system uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 0°C, evaporator 2 at -26.4°C, and the condenser at 800kPa. The refrigerant is circulated through the compressor at a rate of 0.1kg/s and the low temperature evaporator serves a cooling load of 8 kW.Determine the cooling rate of the high-temperature evaporator, the power required by the compressor, and the COP of the system. The refrigerant is saturated liquid at the exit of the condenser and saturated vapor at the exit of each evaporator, and the compressor is isentropic.
A commercial refrigerator using R-134a as a refrigerant is used to keep the cooled environment at -35 C. The refrigerator releases the waste heat to the cooling water that enters the condenser at 18 C at 0.25 kg / s and leaves the condenser at 26 C. The refrigerant enters the condenser at a pressure of 1.2 MPa and a temperature of 50 ° C, and leaves the condenser at the same pressure, supercooled at 5 ° C. Since the compressor consumes 3.3 kW of power, a) Mass flow rate of the refrigerant, b) Cooling load and COP value c) Calculate the minimum power consumed by the compressor for the same cooling load.
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at –35°C by rejecting 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 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine the mass flow rate of the refrigerant,
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at –35°C by rejecting 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 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine the refrigeration load.