period four

Expansion Devices

notes

Thermostatic Expansion Valve

thermostatic expansion valve (TXV)

evaporator

liquid

refrigerant

liquid/vapor mixture

A

refrigerant vapor

Figure 40

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.

TXV Control

 

liquid

 

liquid/vapor refrigerant

A

mixture

 

 

refrigerant

 

vapor

Figure 41

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.

TRG-TRC005-EN

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Image 34
Trane trg-trc005-en manual Thermostatic Expansion Valve, TXV Control

trg-trc005-en specifications

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