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 condensersaturated also. Find out the change of; (a) Mass flow rate of refrigerant, (b) Power consumed, (c) Volumetricefficiency, and (d) Piston displacement in the following to cases (i) The evaporation temperature is decreasedto -27 °C due to a change of product while the condensing temperature is still constant, (ii) The condensingtemperature is increased to 45 °C due to a change of outside conditions while the evaporating temperature is stillconstant at -20 °C.

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Answered: Q3/ A refrigeration unit of 20 T.R uses…

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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