This document provides an overview of refrigeration and its key components. It discusses heat pumps and refrigerators, and how they maintain higher or lower temperatures than their surroundings. The document then focuses on vapor compression refrigeration systems. It describes each major component - the compressor, condenser, receiver, expansion valve, and evaporator. It explains the purpose of each component and the changes to the refrigerant that occur within each part of the vapor compression cycle.

1. KALI CHARAN NIGAM INSTITUTE OF
TECHNOLOGY, BANDA
LECTURE
ON
INTRODUCTION TO REFRIGERATION
FUNDAMENTAL OF MECHANICAL ENGINEERING (BME101)
( I SEMESTER )
BY : DEEPAK KUMAR YADAV
ME DEPARTMENT

2. HEAT PUMP
Heat pump is a device is used to maintain a higher
temperature as compared to surrounding by
supplying heat to system.
 Coefficient of Performance (COP):
COP of a heat pump is expressed
by ratio of amount of heat delivered
to hot body to amount of work
required to be done on the system

3. REFRIGERATOR
Refrigerator is a device is used to maintain a lower
temperature as compared to surrounding by
absorbing heat from the system.
COP of refrigerator

4. VAPOUR COMPRESSION REFRIGERATION
SYSTEM

5. COMPONENTS OF VAPOUR
COMPRESSION REFRIGERATION SYSTEM
Compressor:
The low pressure and temperature vapour
refrigerant from the evaporator is drawn into the
compressor through the inlet or suction valve.
 where it is compressed to high pressure and
temperature.
The high pressure and temperature vapour
refrigerant is discharged into the condenser through
the delivery or discharge valve.

6. COMPONENTS OF VAPOUR
COMPRESSION REFRIGERATION SYSTEM
Condenser:
The condenser or cooler consists of coils of pipe
in which the high pressure and temperature
vapour refrigerant is cooled and condensed.
The refrigerant, while passing through the
condenser, rejects its latent heat to the external
surrounding air.
Thus hot refrigerant vapour received from the
compressor is converted into liquid form in the
condenser.

7. COMPONENTS OF VAPOUR
COMPRESSION REFRIGERATION SYSTEM
Receiver:
The condensed liquid refrigerant from the
condenser is stored in a vessel, known as a
receiver, from where it is supplied to the
expansion valve or refrigerant control valve.

8. COMPONENTS OF VAPOUR
COMPRESSION REFRIGERATION SYSTEM
Expansion Valve or Throttle Valve:
The function of this valve is to allow the liquid
refrigerant under high pressure and temperature
to pass at a controlled rate after reducing its
pressure and temperature.
 Some of the liquid refrigerant evaporates as it
passes through the expansion valve, but the
greater portion is vaporized in the evaporator at
the low pressure and temperature.

9. COMPONENTS OF VAPOUR
COMPRESSION REFERIGERATION SYSTEM
Evaporator:
An evaporator consists of coils of pipe in which the
liquid-vapour refrigerant at low pressure and
temperature is evaporated and changed into vapour
refrigerant at low pressure and temperature.

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