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TRG-TRC005-EN 17
period three
Evaporators
notes
The fins of the coil are formed to produce turbulence as the air passes through
them. This turbulence enhances heat transfer, preventing stratification within
the coil-leaving airstream.
To provide uniform heat transfer throughout the coil, the liquid refrigerant is
distributed to the coil tubes in several parallel circuits. A distributor is used to
ensure uniform refrigerant distribution through these multiple coil circuits. It
distributes the liquid/vapor refrigerant mixture to the coil through several tubes
of equal length and diameter.
As the refrigerant passes through the tubes of the coil, the liquid refrigerant
absorbs heat from the air, causing it to boil off into vapor. The refrigerant vapor
leaves the coil tubes and collects in a suction header.
Turbulent Flow
Figure 25
Finned-Tube Evaporator
liquid/vapor
liquid/vapor
refrigerant
refrigerant
refrigerant vapor
refrigerant vapor
liquid
liquid
distributor
distributor
airflow
airflow
suction
suction
header
header
Figure 26