Q3/ A refrigeration unit of 20 T.R uses R-12 as a refrigerant and works between evaporating and condensing (10 degree) temperature of -20 °C and 37 °C. The vapor leaves the evaporator saturated and the liquid leaves the condenser saturated also. Find out the change of; (a) Mass flow rate of refrigerant, (b) Power consumed, (c) Volumetric efficiency, and (d) Piston displacement in the following to cases (i) The evaporation temperature is decreased to -27 °C due to a change of product while the condensing temperature is still constant, (ii) The condensing temperature is increased to 45 °C due to a change of outside conditions while the evaporating temperature is still constant at -20 °C.
Q3/ A refrigeration unit of 20 T.R uses R-12 as a refrigerant and works between evaporating and condensing (10 degree) temperature of -20 °C and 37 °C. The vapor leaves the evaporator saturated and the liquid leaves the condenser saturated also. Find out the change of; (a) Mass flow rate of refrigerant, (b) Power consumed, (c) Volumetric efficiency, and (d) Piston displacement in the following to cases (i) The evaporation temperature is decreased to -27 °C due to a change of product while the condensing temperature is still constant, (ii) The condensing temperature is increased to 45 °C due to a change of outside conditions while the evaporating temperature is still constant at -20 °C.
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
Chapter48: Cooling Towers And Pumps
Section: Chapter Questions
Problem 13RQ
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![Q3/ A refrigeration unit of 20 T.R uses R-12 as a refrigerant and works between evaporating and condensing
(10 degree)
temperature of -20 °C and 37 °C. The vapor leaves the evaporator saturated and the liquid leaves the condenser
saturated also. Find out the change of; (a) Mass flow rate of refrigerant, (b) Power consumed, (c) Volumetric
efficiency, and (d) Piston displacement in the following to cases (i) The evaporation temperature is decreased
to -27 °C due to a change of product while the condensing temperature is still constant, (ii) The condensing
temperature is increased to 45 °C due to a change of outside conditions while the evaporating temperature is still
constant at -20 °C.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe539b050-6b1d-4e8a-959a-4012c5cd6c84%2Fb47bda25-1996-4e2e-ae3c-89f841cf11e0%2Fppadtep_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q3/ A refrigeration unit of 20 T.R uses R-12 as a refrigerant and works between evaporating and condensing
(10 degree)
temperature of -20 °C and 37 °C. The vapor leaves the evaporator saturated and the liquid leaves the condenser
saturated also. Find out the change of; (a) Mass flow rate of refrigerant, (b) Power consumed, (c) Volumetric
efficiency, and (d) Piston displacement in the following to cases (i) The evaporation temperature is decreased
to -27 °C due to a change of product while the condensing temperature is still constant, (ii) The condensing
temperature is increased to 45 °C due to a change of outside conditions while the evaporating temperature is still
constant at -20 °C.
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