8/08/2015

chiller trane electronic expansion valve

chiller trane
electronic expansion valve


electronic expansion valve
Expansion Device:
An expansion device is used to maintain the pressure difference between the high-pressure (condenser) and low-pressure (evaporator) sides of the system ,as established by the compressor. This pressure difference allows the evaporator temperature to be low enough to absorb heat from the water being 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. High-pressure liquid refrigerant flows through the expansion device, causing a large pressure drop that reduces the refrigerant pressure to that of the evaporator. This pressure reduction causes a small portion of the liquid to boil off, or flash, cooling the remaining refrigerant to the desired evaporator temperature In this chiller, the expansion device used is an electronic expansion valve. In addition to maintaining the high- and low-side pressure difference, the electronic expansion valve controls the quantity of liquid refrigerant entering the evaporator to ensure that it will be completely vaporized within the evaporator

orifice plate

The orifice plate:
 is another type of expansion device found in helical-rotary chillers. The column of liquid refrigerant creates a head pressure at its base ,  allowing it to pass through the orifices and undergo a pressure drop equal to the head (H) before it flashes. As the load decreases, less refrigerant is moved throughout the chiller, causing the level of the liquid column to drop. This causes additional flashing at the orifice plate which, in turn, results in feeding less liquid to the evaporator
Separator


Liquid/Vapor Separator:
The mixture of liquid and vapor refrigerant that leaves the expansion device
enters a liquid/vapor separator. Here the liquid refrigerant settles to the
bottom of the chamber and the vapor is drawn off the top and routed directly to
the suction side of the compressor. The remaining liquid refrigerant is then
routed to the evaporator.
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