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TRG-TRC005-EN 19
period three
Evaporators
notes
Shell-and-Tube Evaporators
Instead 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.
Baffles within the shell direct the water in a rising and falling flow path over the
tubes that carry the refrigerant. This results in turbulence that improves heat
transfer.
Shell-and-Tube Evaporator
refrigerant
refrigerant
vapor
vapor
chilled
chilled
water
water
return
return
chilled
chilled
water
water
supply
supply
tube bundle
tube bundle
baffles
baffles
liquid/vapor
liquid/vapor
refrigerant
refrigerant
Figure 28
Shell-and-Tube Evaporator
baffles
baffles
Figure 29