Answered: VAPOR COMPRESSION REFRIGERATION SYSTEM…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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VAPOR COMPRESSION REFRIGERATION SYSTEM ANALYSIS
3
Warm
environment
Он
Condenser
Expansion
valve
Evaporator
QL
Cold refrigerated
space
in
Compressor
1
FIGURE 1: VAPOR COMPRESSION REFRIGERATION CYCLE
The chiller system operates based on the vapour compression refrigeration cycle (figure 1) with a
single stage compression. The isentropic efficiency of the compressor is assumed at 85%. The
refrigerant exit evaporator and condenser can be assumed as saturated.

Transcribed Image Text:QUESTION 1 [CO1] Select one commercial refrigerant (other than R134a) i. Give three main reasons of the selection based on thermodynamic or heat transfer point of view. ii. QUESTION 2 [CO2] i. ii. iii. iv. V. vi. Assign a suitable operating pressure for the above-mentioned refrigeration system. Please explain the choice of pressures. vii. Sketch a T-s diagram and label the pressures selected in previous question. Determine the rate of heat removal from refrigerated space (kJ/kg) Determine the rate of heat rejection to the environment (kJ/kg) Calculate the actual compressor power input (kJ/kg) Find the COP of the refrigerator Determine a range of suitable refrigerant mass feed rate (in kg/s) to obtain a practical design (2<COP<4) Discuss the effect of refrigerant feed rate to the COP profile.

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