A 20-ton industrial refrigeration system is used to maintain a freezer room at 20oF. The system...
A 20-ton industrial refrigeration system is used to maintain a freezer room at 20oF. The system uses R-22 refrigerant with evaporating temperature of 10oF and a condensing temperature of 100oF. The refrigerant enters the compressor at 20oF and exits the condenser at 85oF. Sketch the cycle on a p-h diagram and determine:
a) The Carnot COP
b) The compressor suction and discharge pressures in psig
c) The refrigerant mass flow rate, lbs./h
d) The specific volume of the refrigerant at the compressor suction and discharge.
e) The refrigerant quality at the evaporator inlet.
f) The ideal COP
g) The ideal input power of the compressor (Btu/h and hp)
h) The actual COP calculated from manufacturer’s performance tables if a scroll-type compressor is used
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A 20-ton industrial refrigeration system is used to maintain a
freezer room at 20oF. The system...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the working fluid. The evaporator pressure is 2 bar and the condenser pressure is 30 bar. The refrigerant leaves the compressor at 160oC. 1 ton of refrigeration = 3.517 kW Determine the cooling load, in kW. Plot all five points (1, 2s, 2a, 3, 4) on the P-h diagram. Determine the power consumed by the refrigeration system, in kW. Determine the COP of the system. Isentropic efficiency...
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The system shown in the diagram provides 20tons of refrigeration. The system uses 134-a refrigerant. Using...
The
system shown in the diagram provides 20tons of refrigeration. The
system uses 134-a refrigerant. Using the data indicated on the
diagram.
A) find the minimum work requirement to the compressor
B) compute the coefficient of performance
C) determine the coefficient of performance of a Carnot
refrigerator operating between the temperature limits of this
system
D) show the cycle on a properly labeled T-s diagram with
respect to the saturation lines.
(On the diagram, lets say compressor to the condenser...
4. A water chiller provides 100 tons 3.516 kw/ton of refrigeration to cool water to a...
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refrigeration system is required to supply 20 tons of refrigeration at an evaporator Qi: A cascade enerature of -50...
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Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C....
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A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as saturated vapor at -15°(State 1). It then goes through a reversible adiabatic compressor to reach State 2. After flowing through the condenser (a heat exchanger), the refrigerant exits as saturated liquid at 70°C (State 3). It is then throttled by going through an expansion valve, to reach State 4. It finishes the cycle by going through another heat exchanger (the evaporator), to return to State 1....
The
system shown in the diagram provides 20tons of refrigeration. The
system uses 134-a refrigerant. Using the data indicated on the
diagram.
A) find the minimum work requirement to the compressor
B) compute the coefficient of performance
C) determine the coefficient of performance of a Carnot
refrigerator operating between the temperature limits of this
system
D) show the cycle on a properly labeled T-s diagram with
respect to the saturation lines.
(On the diagram, lets say compressor to the condenser...
4. A water chiller provides 100 tons 3.516 kw/ton of refrigeration to cool water to a temperature of 12.10 C for an air conditioning system. The heat extracted from the water is to be rejected in a cooling tower at 35.4°C, Assuming that the chiller operates on an ideal vapour refrigeration cycle with the temperature in the evaporator equal to the chilled water temperature and the saturation temperature in the condenser equal to the cooling tower water temperature, determine (a)...
refrigeration system is required to supply 20 tons of refrigeration at an evaporator Qi: A cascade enerature of -50 °C and a condenser temperature of 40 °C. The load at 50 Cbedby unit using as the refrigerant and is rejected to a cascade condenser at -10 C. This cascade condenser is cooled by R-12 as the refrigerant and operating between -25 °C evaporating temperatures and 40 ec unit using The refrigerant leaving the R-12 condenser is sub-cooled by 5 °C...
Refrigeration Question 1 a) A refrigerant R134a refrigerator is to maintain the refrigerated space at -100C. Would you recommended an evaporator pressure of 1.6 bar or 2 bar for this system? Why? -la An automotive Air conditioner using refrigerant R134a as the working fluid and operating on ideal vapor compression refrigerant cycle is to maintain a space at 24°C while operating its condenser at 1000 kPa. Determine the COP of the system when a temperature difference of 14°C is allowed...
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C. The wide temperature range is difficult to achieve with a single refrigerant, because the refrigerant will generally be at excessively high pressures at the top of the temperature range, and sub-atmospheric pressures at the bottom end The problem is solved with a 2-stage cascaded system that uses refrigerant 134a (R134a) and refrigerant 22 (R22) respectively for the high temperature...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, 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 refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
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