a) Flash chamber is commonly used in a multistage compression refrigeration system. Would the use of flash chamber increases or decreases the compressor work input and refrigerating effect? © @)
a) Flash chamber is commonly used in a multistage compression refrigeration system. Would the use of flash chamber increases or decreases the compressor work input and refrigerating effect? © @)
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
Chapter3: Refrigeration And Refrigerants
Section: Chapter Questions
Problem 10RQ: If the evaporating pressure was 76 psig for R-22 and the compressor inlet temperature was 65F, what...
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![a)
15:20
people.utm.my
Flash chamber is commonly used in a multistage compression refrigeration system. Would
the use of flash chamber increases or decreases the compressor work input and refrigerating
effect?
b)
A two-stage compression refrigeration system operates between the pressure limits of
0.10 MPa and 1.0 MPa. Refrigerant134-a is used as the working fluid in the refrigeration
system. The refrigerant leaves the condenser at 38°C and is throttled to a flash chamber
operating at 0.60 MPa. The refrigerant leaves the low-pressure compressor at 0.60 MPa and
flows to a mixing chamber, then mixed with the saturated vapour separated from the flash
chamber. The vapour from the mixing chamber is then compressed to the condenser
pressure by the high-pressure compressor. The saturated liquid from the flash chamber is
throttled to the evaporator pressure. The mass flow rate through the condenser is 0.3 kg/s.
The refrigerant leaves the evaporator at -10°C. Assume that both compression processes are
isentropic.
ii)
iii)
iv)
!!!! 4G
<
Sketch and label the cycle on a P-h diagram.
Calculate the mass flow rate of the saturated vapour leaves the flash chamber, kg/s.
Determine the rate of heat removed from the refrigerated space, kW.
Calculate the coefficient of performance (COP) of the refrigeration system.
□](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7ae82027-6932-4d04-b62e-2d1911f87eb4%2Ffb144442-3475-4aca-bd0b-7bde8693ec20%2Fzp0m7ug_processed.png&w=3840&q=75)
Transcribed Image Text:a)
15:20
people.utm.my
Flash chamber is commonly used in a multistage compression refrigeration system. Would
the use of flash chamber increases or decreases the compressor work input and refrigerating
effect?
b)
A two-stage compression refrigeration system operates between the pressure limits of
0.10 MPa and 1.0 MPa. Refrigerant134-a is used as the working fluid in the refrigeration
system. The refrigerant leaves the condenser at 38°C and is throttled to a flash chamber
operating at 0.60 MPa. The refrigerant leaves the low-pressure compressor at 0.60 MPa and
flows to a mixing chamber, then mixed with the saturated vapour separated from the flash
chamber. The vapour from the mixing chamber is then compressed to the condenser
pressure by the high-pressure compressor. The saturated liquid from the flash chamber is
throttled to the evaporator pressure. The mass flow rate through the condenser is 0.3 kg/s.
The refrigerant leaves the evaporator at -10°C. Assume that both compression processes are
isentropic.
ii)
iii)
iv)
!!!! 4G
<
Sketch and label the cycle on a P-h diagram.
Calculate the mass flow rate of the saturated vapour leaves the flash chamber, kg/s.
Determine the rate of heat removed from the refrigerated space, kW.
Calculate the coefficient of performance (COP) of the refrigeration system.
□
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