Vapour Compression Refrigeration

Dr. M. Zahurul Haq

Professor

Department of Mechanical Engineering

Bangladesh University of Engineering & Technology (BUET)

Dhaka-1000, Bangladesh

zahurul@me.buet.ac.bd

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

800

1000

1200

1400

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