Non-condensables in a refrigeration system most directly cause discharge pressure to

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Multiple Choice

Non-condensables in a refrigeration system most directly cause discharge pressure to

Explanation:
Non-condensables raise condenser head pressure, which directly pushes up the discharge pressure. When air or other non-condensable gases are present in the condenser, they form a gas layer that insulates and impedes heat transfer. This makes it harder for the refrigerant vapor to condense, so the condenser operates at a higher pressure and temperature. The compressor must then discharge vapor at this higher head pressure, increasing discharge pressure. In short, the extra gas in the condenser reduces condensation efficiency and drives up the pressure the compressor has to work against.

Non-condensables raise condenser head pressure, which directly pushes up the discharge pressure. When air or other non-condensable gases are present in the condenser, they form a gas layer that insulates and impedes heat transfer. This makes it harder for the refrigerant vapor to condense, so the condenser operates at a higher pressure and temperature. The compressor must then discharge vapor at this higher head pressure, increasing discharge pressure. In short, the extra gas in the condenser reduces condensation efficiency and drives up the pressure the compressor has to work against.

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