Now, with less refrigerant in the evaporator, the vapor leaving the evaporator will be superheated. If, in this example, the superheated vapor leaving the evaporator rises to 50°F (10° superheat), then the temperature of the charge in the bulb will also rise to 50°F.
At a temperature of 50°F, the charge has a pressure (pushing on the diaphragm) of 47 psig.
We now see that the 10° superheat created a pressure differential between the charge and the evaporator equal to:
charge 47 psig
evaporator -37 psig
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