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Ql:- Multi-evaporator system with single compressor and individual expansion valves system used refrigerant 143a at two different temperatures with a single compressor and a single condenser. The low- temperature evaporator operates at -20 °C with saturated vapor at its exit and has a refrigerating capacity of 4 tons. The higher-temperature evaporator produces saturated vapor at 3 bar at its exit and has a refrigerating capacity of 2.5 tons. The compression with isentropic efficiency 85% to the condenser pressure of 10 bar. There are no significant pressure drops in the flows through the condenser and the two evaporators, and the refrigerant leaves the condenser as saturated liquid at 10 bar. Draw the schematic diagram of the cycle and p-h diagram then calculate: 1) The mass flow rate of refrigerant through each evaporator. 2) The compressor power input, in kW. 3) The C.O.P.

Ql:- Multi-evaporator system with single compressor and individual expansion valves system used refrigerant 143a at two different temperatures with a single compressor and a single condenser. The low- temperature evaporator operates at -20 °C with saturated vapor at its exit and has a refrigerating capacity of 4 tons. The higher-temperature evaporator produces saturated vapor at 3 bar at its exit and has a refrigerating capacity of 2.5 tons. The compression with isentropic efficiency 85% to the condenser pressure of 10 bar. There are no significant pressure drops in the flows through the condenser and the two evaporators, and the refrigerant leaves the condenser as saturated liquid at 10 bar. Draw the schematic diagram of the cycle and p-h diagram then calculate: 1) The mass flow rate of refrigerant through each evaporator. 2) The compressor power input, in kW. 3) The C.O.P.

Refrigeration and Air Conditioning Technology (MindTap Course List)
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
Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems
Section: Chapter Questions
Problem 9RQ: The approach temperature for the evaporator is A. the difference between the suction and head...
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Q1:- Multi-evaporator system with single compressor and individual expansion valves system used refrigerant 143a at two different temperatures with a single compressor and a single condenser. The low- temperature evaporator operates at -20°C with saturated vapor at its exit and has a refrigerating capacity of 4 tons. The higher-temperature evaporator produces saturated vapor at 3 bar at its exit and has a refrigerating capacity of 2.5 tons. The compression with isentropic efficiency 85% to the condenser pressure of 10 bar. There are no significant pressure drops in the flows through the condenser and the two evaporators, and the refrigerant leaves the condenser as saturated liquid at 10 bar. Draw the schematic diagram of the cycle and p-h diagram then calculate: 1) The mass flow rate of refrigerant through each evaporator. 2) The compressor power input, in kW. 3) The C.O.P. 4) The rate of heat transfer from the refrigerant passing through the condenser, in kW. 5) Volumetric displacement of the compressor cylinder if the clearance ratio is 5% and k=1.13.
Transcribed Image Text:Q1:- Multi-evaporator system with single compressor and individual expansion valves system used refrigerant 143a at two different temperatures with a single compressor and a single condenser. The low- temperature evaporator operates at -20°C with saturated vapor at its exit and has a refrigerating capacity of 4 tons. The higher-temperature evaporator produces saturated vapor at 3 bar at its exit and has a refrigerating capacity of 2.5 tons. The compression with isentropic efficiency 85% to the condenser pressure of 10 bar. There are no significant pressure drops in the flows through the condenser and the two evaporators, and the refrigerant leaves the condenser as saturated liquid at 10 bar. Draw the schematic diagram of the cycle and p-h diagram then calculate: 1) The mass flow rate of refrigerant through each evaporator. 2) The compressor power input, in kW. 3) The C.O.P. 4) The rate of heat transfer from the refrigerant passing through the condenser, in kW. 5) Volumetric displacement of the compressor cylinder if the clearance ratio is 5% and k=1.13.
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ISBN:
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