Abstract: A heat exchanger for use with high pressure gases is disclosed which has a generally cylindrical shell through which pressurized gas is passed. A plurality of stacked, high pressure, fluid-carrying serial coils are arranged in parallel serpentine paths within a frame member to form a structurally independent unit. The frame member is attached to an inner support member provided within the shell to position and align the frame member and coils. In operation, the coils are arranged primarily transverse to the flow of the gas, yet, because of the serpentine path, the flow of fluid through the coils is counter to or parallel with the flow of gas in the shell. The frame member supports the serpentine coils and contains any vibrations of the coils caused by the shell gases passing over the coils.

Abstract: An improved method and apparatus for recovery of waste heat of the type having a first heat exchanger which transfers heat to a working fluid and a second heat exchanger which transfers heat from the working fluid is disclosed. The improvement comprises the provision of at least one storage tank for the working fluid having a volume calculated by the flow rate of the working fluid multiplied by a time difference between the time in which the combusiton chamber has its peak fuel requirement and a next subsequent time at which a maximum amount of waste heat is available to the combustion chamber. This minimum capacity can be obtained by the provision of one tank or several tanks having a combined storage capacity which meets or exceeds the calculated volume. Preferably the storage tank, or combination of storage tanks, is positioned between the heat exchangers so as to receive heated working fluid from the first heat exchanger and provide heated working fluid to the second heat exchanger.