counterflow water tube boiler

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• Steam engine — A steam engine is a heat engine that performs mechanical work using steam as its working fluid. [ [http://www.britannica.com/EBchecked/topic/564472/steam engine steam engine Britannica Online Encyclopedia ] ] Steam engines have a long history,… …   Wikipedia

• heat exchanger — a device for transferring the heat of one substance to another, as from the exhaust gases to the incoming air in a regenerative furnace. [1900 05] * * * Any of several devices that transfer heat from a hot to a cold fluid. In many engineering… …   Universalium