3. A refrigerator uses refrigerant-134a as its working fluid and operates on the ideal vapor- compression refrigeration cycle. The refrigerant evaporates at 5°F and condenses at 180 psia. This unit serves a 42,500 Btu/h cooling load. Determine the mass flow rate of the refrigerant and the power that this unit will require.

3. A refrigerator uses refrigerant-134a as its working fluid and operates on the ideal vapor- compression refrigeration cycle. The refrigerant evaporates at 5°F and condenses at 180 psia. This unit serves a 42,500 Btu/h cooling load. Determine the mass flow rate of the refrigerant and the power that this unit will require.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 2RQ: The operating condition for the single compressor in a household refrigerator is the lowest box...

See similar textbooks

Similar questions

Why is two-stage compression popular for extra-low-temperature refrigeration systems?
Refrigerators currently being manufactured in the United States are using______as their refrigerant.
What are the two types of evaporators found in house-hold refrigerators?
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
1. A 10-kW cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 400 kPa and its condenser at 800 kPa. If the compressor's isentropic efficiency is 68%, calculate the refrigerant mass flow rate and the compressor power requirement when refrigerant-134a is used.
3.23: An ideal refrigeration cycle operates with R134a as the working fluid. The temperature of refrigerant in the condenser and evaporator are 40°c and -20°c respectively. The mass flow rate of refrigerant is 0.1 kg/s. Determine the cooling capacity and cop of the plant. Take enthalpy of refrigerant vapour at the end of compression as 276 kJ/kg. 40°C 2 -20°C/ 3 40°C -20°C h
question 51 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. What is the mass flow rate of refrigerant in kg/s to 4 decimal places? No need to add units to the answer.
3. An Ammonia refrigerant vapor compression system is utilized as an air-cooled water chiller. It is operating at a condenser temperature of 40°C and an evaporator temperature of 0°C. The system develops 15 Tons of Refrigeration. Determine: a. The discharge temperature and mass flow rate of the refrigerant circulated. b. The theoretical piston displacement of the compressor. c. The theoretical compressor work. d. The heat rejected in the condenser. e. The Carnot COP and the actual COP of the cycle. f. The volume of air supplied in the condenser if it enters at 30°C and leaves at 34°C. g. LMTD and AMTD in the condenser h. The water flow rate of the chiller if it enters the evaporator at 10°C and
A vapor-compression refrigeration cycle with Refrigerant 134a as the working fluid operates with an evapo-rator temperature of 50◦F and a condenser pressure of 180 lbf/in2Saturated vapor enters the compressor. Refrigerantenters the condenser at 140◦F and exits as saturated liquid. The cycle has a refrigeration capacity of 5 tons (a) the refrigerant mass flow rate, in lb/min. b) the compressor isentropic efficiency. (c) the compressor power, in horsepower. (d) the coefficient of performance.
A vapor compression refrigeration system operates on the cycle shown below (from Smith, Van Ness, and Abbott text). The refrigerant is tetrafluoroethane (P-H diagram from Smith, Van Ness, and Abbott text on next page). Determine the circulation rate of the refrigerant (in kg/s), the heat transfer rate in the condenser (in kW), the actual power requirement from compressor (in kW), the overall coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the following operating data: Evaporation T = -10°C; Condensation T = 26°C; Compressor Efficiency Factor = 0.8; Refrigeration rate = 500 kJ/s.
An ideal ammonia (R – 717) vapor-compression refrigeration cycle has an evaporator temperature of –20 C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3 kg/min. Determine the compressor work, kW.
What are the four processes that make up the simple ideal vapor compression refrigeration (VCR) cycle? Make sure you mention what is physically happening during each process Themodynamics question. please explain briefly.Thank you