Vapor Compression Chillers

Vapor Compression Chillers Description : –

The vapor-compression chillers uses a circulating liquid refrigerant  as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere.  All such systems have four components: a  compressor, a condenser , a thermal expansion valve(also called a throttle valve or metering device), and an evaporator. Circulating refrigerant enters the compressor in the thermodynamic state known as a saturated vapor and is compressed to a higher pressure, resulting in a higher temperature as well. The hot, compressed vapor is then in the thermodynamic state known as a superheated vapor and it is at a temperature and pressure at which it can be condensed  with either cooling water or cooling air flowing across the coil or tubes. This is where the circulating refrigerant rejects heat from the system and the rejected heat is carried away by either the water or the air (whichever may be the case).

Technical in Vapor Compression Chillers : –

The condensed liquid refrigerant, in the thermodynamic state known as a saturated liquid , is next routed through an expansion valve where it undergoes an abrupt reduction in pressure. That pressure reduction results in the adiabatic flash evaporation of a part of the liquid refrigerant. The auto-refrigeration effect of the adiabatic flash evaporation lowers the temperature of the liquid and vapor refrigerant mixture to where it is colder than the temperature of the enclosed space to be refrigerated.