METHOD FOR DETERMINING THE SPECIFIC THERMAL EFFICIENCY INDEX OF A FLOW HEAT EXCHANGER
Annotation
A method for determining the conditions of maximum efficiency of a helium vapor flow cryostat designed to maintain a predetermined temperature level of the lens of a cryogenic optoelectronic de-vice is proposed. A mathematical model of the process of cryostatting object cooling with the use of a pipeline mounted on the surface of the object for a constant mass rate flow of helium vapors, is pre-sented. The pipeline contact with the object surface is assumed to be ideal. It is shown that it is neces-sary to ensure full recovery of helium vapors with the pipeline for the most efficient cooling with a mini-mum flow rate of cryoagent. Requirements for the length of the pipeline providing full recovery in the heat exchanger are determined using preliminary calculated thermal efficiency per unit length of the pipeline. This specific index of thermal efficiency (SITE) of the flow heat exchanger is an objective crite-rion of the condition of full recovery. Analytical formulas for calculating the thermal efficiency index for laminar, transient, and turbulent regimes of helium vapor flow are derived. The formulas represent the dependences on the mass flow rate and the diameter of the pipeline accounting for the cryostatting temperature level. The efficiency and convenience of the obtained analytical dependences for practical calculations, as well as for the choice of parameters of flow cryostats are demonstrated.
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