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heat exchanger (plural heat exchangers)

  1. (physics) Any device (such as a radiator) that transfers heat from one fluid to another via a separating wall.
    • 1960 June, “The N.B. Loco. Co. diesel-hydraulic Type "2" locomotive”, in Trains Illustrated, page 345:
      The transmission oil is cooled in a heat exchanger through which the cooling water is circulated, to assist rapid warming of the engine system and to bring engine and transmission into their true interdependence.

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