7.6 Regenerative Cooling
To produce cumulative cooling effect, the expanded gas is made to flow out as a counter current through a double-walled pipe whose inner wall is constituted by the inlet pipe leading the gas on the expansion engine. The double-walled pipe is wound as a helix on a large cone-shaped stainless steel form. The coil is placed inside a vacuum chamber.
The whole system thus formed is called the heat interchanger. The inner tube is connected to the inlet valve of the expansion engine while the outer tube is connected to the exhaust valve of the engine. The incoming gas is progressively cooled by the gas flowing out through the double- walled chamber.
Figure 7.7 shows the change of temperature suffered by a given mass of gas as ...
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