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The disadvantage of this configuration is that it requires two valves for control. An additional valve (or possibly fixed orifice) on the vapor line controls the evaporator exit state. Depending on the adjustment of the valve on the vapor line, the mass flow through the vapor line and evaporator, and the evaporating temperature and pressure, will adjust so that the pressure drop across both lines equilibrates. For a closed loop system, a sensor at the evaporator exit provides feedback for control of the valve: for example, a thermostatic expansion valve could be used on the vapor line or the combination of a thermocouple, electronic expansion valve and controller could be used. Adjustment of the throttling valve works similarly to the low-pressure receiver system, where refrigerant is moved to or from the condenser to determine the high side pressure. By removing vapor from the refrigerant and sending only liquid to the evaporator, distribution in the header of the evaporator is improved. This results in more uniform distribution of refrigerant in the heat exchanger, which maximizes the evaporator’s effectiveness. 72PDF Image | Comparison of R744 and R410A
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