Tube in tube heat exchangers are commonly used in various cryogenics applications which require high pressure gas with low flow rates, such as, gas purifiers, gas precoolers, etc. The design of these heat exchangers for low temperature applications calls for special considerations due to various reasons, viz. significant changes in thermophysical properties of the working fluid at lower temperatures, longitudinal conduction through tubes, heat inleaks, etc. In order to consider their effects during design, a comprehensive design procedure based on fundamental understanding has to be developed. The present work aims at development of such design procedure for these heat exchangers. The predictions of the design are compared with the experimental results for the temperature range of 3OO-77 K.
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