Vapour Compression Refrigeration
Dr. M. Zahurul Haq
Professor
Department of Mechanical Engineering
Bangladesh University of Engineering & Technology (BUET)
Dhaka-1000, Bangladesh
http://teacher.buet.ac.bd/zahurul/
ME 415: Refrigeration & Building Mechanical Systems
c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 1 / 8
Working Principle of Vapour Compression Refrigeration
Evaporation & Condensation of Refrigerant, R134a
-50 -40 -30 -20 -10 0 10 20 30 40 50 0
200
400
600
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P sa
t (kP
a)
T sat
( o C)
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Refrigerant boils & condenses at different temperatures at different
pressures. During boiling/condensation it absorbs/rejects latent heat.c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 2 / 8
Working Principle of Vapour Compression Refrigeration
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 3 / 8
Working Principle of Vapour Compression Refrigeration
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Float Valve to maintain liquid level
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TXV to regulate liquid flow
c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 4 / 8
Working Principle of Vapour Compression Refrigeration
Basic Components of a Refrigeration System
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 5 / 8
Working Principle of Vapour Compression Refrigeration
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 6 / 8
Vapour Compression Refrigeration System Components
Key Components of Refrigeration System
1 Evaporator
2 Suction line
3 Vapour compressor
4 Hot gas/discharge line
5 Condenser
6 Receiver tank
7 Liquid line
8 Refrigerant flow control device
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 7 / 8
Vapour Compression Refrigeration System Components
Components of Vapour Compression (VC) System
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 8 / 8
Vapour Compression Refrigeration System Components
Evaporator
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 9 / 8
Vapour Compression Refrigeration System Components
Compressor
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 10 / 8
Vapour Compression Refrigeration System Components
Condenser
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 11 / 8
Vapour Compression Refrigeration System Components
Expansion Device
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c© Dr. M. Zahurul Haq (BUET) Intro to VC Refrigeration ME 415 (2011) 12 / 8