A refrigerator use 134a as the working fluid and operates on an ideal vapor- compression cycle refrigeration cycle between 0.3-0.95MPA. If the mass flow rate of the refrigerant is 0.005 Kg/s Determine : a- The rate of heat removed from the refrigerated space. b- The power input to the compressor. c- The heat rejected to the environment. d- COP

A refrigerator use 134a as the working fluid and operates on an ideal vapor- compression cycle refrigeration cycle between 0.3-0.95MPA. If the mass flow rate of the refrigerant is 0.005 Kg/s Determine : a- The rate of heat removed from the refrigerated space. b- The power input to the compressor. c- The heat rejected to the environment. d- COP

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1. An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at -12°C. Determine this system's COP and the amount of power required to service a 150 kW cooling load. Answers: 4.87, 30.8 kW
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The following information is provided for a refrigerator operating on the a vapor-compression refrigeration cycle with R-134a: High pressure: 800 kPa Low pressure: 160 kPa Compressor exit temperature: 50 °C The work required to run the refrigerator per kg of refrigerant is?
a) Heat leaks from the air in a kitchen through the walls of a refrigerator into the refrigerated cold space at a rate of 0.3 kW. The refrigerator operates in an ideal vapor compression refrigeration cycle between 1.2 bar and 9 bar. It uses refrigerant R-134a as the working fluid. Determine the coefficient of performance of the refrigerator.
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8.
Please only answer question 4 Parts C and D
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. 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 0.29 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 430 W from the surroundings. The heat exchanger loses no heat to the environment. 26°C 42°C ↓ Condenser 3 Expansion valve Water 18°C Evaporator QL (2) 1.2 MPa 65°C lin Win Compressor 60 kPa -34°C Determine the COP of the refrigerator. (You must provide an answer before moving on to the next part.) The COP of the refrigerator is
Subject Thermodynamics. Instructions: Don't round off in the process. Just round off in the final answer with 2 decimals only. Use 273.15 K to convert Celsius to Kelvin
An ammonia-water absorption refrigeration cycle is used to keep a space at -5 C when the ambient temperature is 20 C. Pure ammonia enters the condenser at 20 bar and 60 C at a rate of 0.02 kg/s. Ammonia leaves the condenser as a saturated liquid and is expanded to 2 bar. Ammonia leaves the evaporator as a saturated vapor. Heat is supplied to the generator by geothermal liquid water that enters at 100 C at a rate of 0.25 kg/s and leaves at 70 C. Determine (a) the cooling capacity (in TR) and (b) COP of the system. The enthalpies of ammonia at various states of the system are: condenser inlet h2 = 1510 kJ/kg, evaporator inlet h4 = 418 kJ/kg, evaporator exit h1 = 1420 kJ/kg. Take the specific heat of geothermal water to be 4.18 kJ/kg-K