“Refrigeration is the process of removing heat from an enclosed space, or from a substance, and rejecting it elsewhere for the primary purpose of lowering the temperature of the enclosed space or substance and then maintaining the temperature below the general temperature of its surrounding”
It is usually done with the aid of a mechanical device (pump/compressor) using a refrigerant which absorbs heat from low temperature (objects/space) and releases heat to elsewhere at high temperature.When refrigerant absorbs the unwanted heat, this raises the refrigerant’s temperature so that it changes from a liquid to a gas, basically, it evaporates. The system then uses condensation to release the heat and change the refrigerant back into a liquid. This is called “Latent Heat”.This cycle is based on the physical principle, that a liquid extracts heat from the surrounding area as it expands (boils) into a gas. To accomplish this, the refrigerant is pumped through a closed refrigeration system which stops the refrigerant from becoming contaminated and controls its flow. The refrigerant will be both a vapour and a liquid in the loop.Refrigeration systems are also used extensively for providing thermal comfort to human beings by means of air conditioning which refers to the treatment of air so as to simultaneously control its temperature, moisture content, cleanliness, odour and circulation, as required by occupants, a process, or products in the space.
STEP 1
The low pressure and temperature vapour refrigerant from evaporator is drawn into the compressor where it is compressed to a high pressure and temperature refrigerant.This high pressure and temperature vapour refrigerant is discharged into the condenser through the delivery or discharge valve.
STEP 2
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, gives up its latent heat to the surrounding condensing medium which is normally air or water.
STEP 3
Expansion 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.
STEP 4
In evaporator, refrigerant at low pressure and temperature is evaporated and changed into vapour refrigerant at low pressure and temperature.In evaporating, the liquid vapour
refrigerant absorbs its latent heat of vaporization from the medium (air, water or brine) which is to be cooled.
STEP 1
The low pressure and temperature vapour refrigerant from evaporator is drawn into the compressor where it is compressed to a high pressure and temperature refrigerant.This high pressure and temperature vapour refrigerant is discharged into the condenser through the delivery or discharge valve.
STEP 2
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, gives up its latent heat to the surrounding condensing medium which is normally air or water.
STEP 3
Expansion 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.
STEP 4
In evaporator, refrigerant at low pressure and temperature is evaporated and changed into vapour refrigerant at low pressure and temperature.In evaporating, the liquid vapour
refrigerant absorbs its latent heat of vaporization from the medium (air, water or brine) which is to be cooled.
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