Non-condensables will cause discharge pressures to be higher than in a system without non-condensables. Which option best describes this effect?

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Multiple Choice

Non-condensables will cause discharge pressures to be higher than in a system without non-condensables. Which option best describes this effect?

Non-condensables in the condenser hinder heat transfer, so the condenser cannot reject heat as effectively. That causes the condenser pressure (and temperature) to rise. Since the compressor must discharge into that higher pressure, the discharge pressure goes up compared to a system with no non-condensables. So the best description is that the discharge pressure becomes higher. The other options don’t fit because the presence of non-condensables does not cause a lower or unchanged discharge pressure, and while some readings can fluctuate, the typical and expected effect is a higher discharge pressure.

Non-condensables in the condenser hinder heat transfer, so the condenser cannot reject heat as effectively. That causes the condenser pressure (and temperature) to rise. Since the compressor must discharge into that higher pressure, the discharge pressure goes up compared to a system with no non-condensables. So the best description is that the discharge pressure becomes higher. The other options don’t fit because the presence of non-condensables does not cause a lower or unchanged discharge pressure, and while some readings can fluctuate, the typical and expected effect is a higher discharge pressure.

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