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A rotary heat wheel in an air conditioning system recovers

  • A.condensate from the cooling coil
  • B.refrigerant vapour from the compressor
  • C.heat, and in some forms moisture, between exhaust and supply air
  • D.electrical energy from the exhaust fan

Answer: C

The wheel turns slowly between the two ducts, taking heat from the warmer stream and giving it to the cooler, and a hygroscopic coating transfers moisture as well. Its penalty is a small cross-leakage between the streams and the fan power to overcome its resistance.

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