The hot tests on a prototype waste heat thermal recuperation system attached to a heavy-duty diesel engine and used with an inert gas as the cycle organic refrigerant described.

TER is a system attached to the engine that uses the waste heat in the hot coolant and can lead to an efficiency improvement of 2 to 4% with correspondingly lower emissions.

The heat balance, pressure losses, energy available for recuperation and other pertinent data are described and discussed.

The equipment proved to be rugged. High-pressure losses in the system were reduced and the heat losses improved. The TER55 refrigerant was easier to handle and could serve as a reasonable substitute for Butane: it is inert, non-CFC based and operates at similar pressures.

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