Chiller Barrel Evaporator – A chiller evaporator barrel exchanges heat between one refrigerant and another. Usually, the primary refrigerant is R-22, R-134A, or some other blend or alternative HFC. The secondary refrigerant is water. This water is circulated throughout the building where it passes through piping and coils. This is generally in most cases a forced air coil where the heat is removed from the air by a heat exchange process with the water and the coil. The cooler air is then forced through ductwork and into the space to be conditioned.
Chiller Barrel Evaporator for Chilled Water Systems
Smaller chillers are typically air cooled while larger systems use a cooling tower. If the heat in the condenser is rejected via air then the chiller will have several fans that will pull air through the condenser coils and the heat is rejected into the atmosphere allowing the refrigerant in the condenser coils to cool and then return to the metering device and the evaporator barrel.
If the chiller uses a condenser then the heat is rejected into water that is circulated through the same condenser where the refrigerant is located. Heat is exchanged from the refrigerant to the water. The water is then pumped to a cooling tower where the cooling tower rejects the heat from the water into the atmosphere using the heat exchange process of evaporation.
HVAC Air Conditioning Chiller Barrel Evaporator
Technical Resource: Refrigeration and Air Conditioning Technology