In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.<br>A:increasing refrigerant pressure in the coil<br>B:increasing chilled water flow through the cooler<br>C:sub-cooling the refrigerant in the condenser<br>D:superheating the refrigerant in the compressor

In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A:increasing refrigerant pressure in the coil
B:increasing chilled water flow through the cooler
C:sub-cooling the refrigerant in the condenser
D:superheating the refrigerant in the compressor

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