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The approach temperature of a heat exchanger is the difference between

  • A.the mean temperatures of the two streams
  • B.the outlet of one stream and the inlet of the other
  • C.the inlet and outlet of the hot stream
  • D.the inlet and outlet of the cold stream

Answer: B

Correct answer: the outlet of one stream and the inlet of the other

It is the gap between what a stream achieved and the best it could have achieved - the temperature of the stream it was exchanging against. A small approach means a close, effective exchange and needs a large surface; a large approach means heat was available and left unrecovered.

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