A recovery cylinder half full of recovered R-410A at 90°F, in the absence of non-condensables, will be pressurized to approximately how many psig?

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Multiple Choice

A recovery cylinder half full of recovered R-410A at 90°F, in the absence of non-condensables, will be pressurized to approximately how many psig?

The main idea is that in a sealed recovery cylinder, the internal pressure is set by the refrigerant’s saturated vapor pressure at the cylinder’s temperature, provided there are no non-condensables. With recovered R-410A in equilibrium between liquid and vapor and no non-condensables, the head pressure corresponds to the saturated vapor pressure of R-410A at 90°F. At this temperature, that pressure is about 300 psig. The exact amount of liquid (half full) doesn’t change the pressure as long as equilibrium exists; if non-condensables were present, the pressure would be higher than the saturation value, and changing the temperature would move the pressure along the refrigerant’s vapor-pressure curve.

The main idea is that in a sealed recovery cylinder, the internal pressure is set by the refrigerant’s saturated vapor pressure at the cylinder’s temperature, provided there are no non-condensables. With recovered R-410A in equilibrium between liquid and vapor and no non-condensables, the head pressure corresponds to the saturated vapor pressure of R-410A at 90°F. At this temperature, that pressure is about 300 psig. The exact amount of liquid (half full) doesn’t change the pressure as long as equilibrium exists; if non-condensables were present, the pressure would be higher than the saturation value, and changing the temperature would move the pressure along the refrigerant’s vapor-pressure curve.

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