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TRG-TRC005-EN 27
period four
Expansion Devices
notes
In addition to maintaining a pressure difference, the thermostatic expansion
valve controls the quantity of liquid refrigerant entering the evaporator. It
ensures that the refrigerant will be completely vaporized within the evaporator
(A) and maintains the proper amount of superheat in the system.
If not enough liquid refrigerant enters the evaporator, it vaporizes too quickly
(A). As a result, the remaining coil tubes fill with vapor, producing very little
refrigeration effect.
Thermostatic Expansion Valve
thermostatic
thermostatic
expansion
expansion
valve (TXV)
valve (TXV)
liquid/vapor
liquid/vapor
mixture
mixture
refrigerant
refrigerant
vapor
vapor
evaporator
evaporator
A
liquid
liquid
refrigerant
refrigerant
Figure 40
TXV Control
liquid/vapor
liquid/vapor
mixture
mixture
refrigerant
refrigerant
vapor
vapor
A
liquid
liquid
refrigerant
refrigerant
Figure 41