In this 13 SEER world, thermostatic expansion valves (often referred to as TEVs or TXVs) are playing a larger role than ever before. These cooling system components have a profound effect on coil and overall system efficiency. TEVs, like fixed metering devices, serve to control refrigerant delivery to the system. Metering devices have a direct effect on making cooling possible, through two very important processes: (1) lowering liquid line refrigerant pressure and (2) controlling the ...

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