(under subclass 177) Apparatus comprising a solid barrier of form or arrangement to affect heat transfer therethrough, there being working fluid* on at least one side of the barrier, there being fluid at another temperature on the other side.
(1) Note. Included under this definition is ambient air as the other fluid provided there is a solid barrier of special form or arrangement (e.g., coil, fins) between it and the working fluid*. See also (1) Note in subclass 177.
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108, for device having a space between the casing* and a surrounding housing with the space being full of working fluid* to permit heat exchange between the working fluid* and parts of the apparatus.
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60, Power Plants,
690+, for fluid motor in which the exhaust fluid is heated or cooled, see section IV of the Main Class Definition, reference to Class 60, (8).
