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26 TRG-TRC005-EN
notes
period four
Expansion Devices
The final major component to be discussed is the expansion device.
An expansion device is used to maintain a pressure difference between the
high-pressure (condenser) and low-pressure (evaporator) sides of the system
established by the compressor. This pressure difference allows the evaporator
temperature to be low enough to absorb heat from the air or water to be
cooled, while also allowing the refrigerant to be at a high enough temperature
in the condenser to reject heat to air or water at normally available
temperatures.
There are several types of expansion devices, including expansion valves
(thermostatic or electronic), capillary tubes, and orifices. This clinic will limit its
discussion to thermostatic expansion valves (TXVs). Other expansion devices
perform essentially the same function.
period four
Expansion Devices
Refrigeration
System Components
Figure 38
Expansion Device
expansion
expansion
device
device
A
D
condenser
condenser
pressure
pressure
enthalpy
enthalpy
evaporator
evaporator
B
C
compressor
compressor
Figure 39