Shell-and-Tube EvaporatorsInstead of producing cooled air, a shell-and-tube evaporator is used to produce chilled water. In this type of evaporator, the cool liquid refrigerant flows through the tubes and water fills the shell space surrounding the tubes. As heat is transferred from the water to the refrigerant, the refrigerant boils inside the tubes and the resulting vapor is drawn to the compressor. Water enters the shell at one end and leaves at the opposite end.This chilled water is pumped to one or more heat exchangers to handle the system cooling load. These heat exchangers could be coils used to cool air or they could be some other load that requires chilled water.
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