NDLI: Design and application of gas-gap heat switches

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Design and application of gas-gap heat switches

Content Provider	NASA Technical Reports Server (NTRS)
Author	Chan, C. K. Ross Jr., R. G.
Copyright Year	1990
Description	Gas-gap heat switches can serve as an effective means of thermally disconnecting a standby cryocooler when the primary (operating) cooler is connected and vice versa. The final phase of the development and test of a cryogenic heat switch designed for loads ranging from 2 watts at 8 K, to 100 watts at 80 K are described. Achieved heat-switch on/off conductance ratio ranged from 11,000 at 8 K to 2200 at 80 K. A particularly challenging element of heat-switch design is achieving satisfactory operation when large temperatures differentials exist across the switch. A special series of tests and analyses was conducted and used in this Phase-2 activity to evaluate the developed switches for temperature differentials ranging up to 200 K. Problems encountered at the maximum levels are described and analyzed, and means of avoiding the problems in the future are presented. A comprehensive summary of the overall heat-switch design methodology is also presented with special emphasis on lessons learned over the course of the 4-year development effort.
File Size	3103123
Page Count	61
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910000909
Archival Resource Key	ark:/13960/t9j43p07d
Language	English
Publisher Date	1990-03-15
Access Restriction	Open
Subject Keyword	Electronics And Electrical Engineering Low Temperature Tests Conductive Heat Transfer Fluid Mechanics Temperature Distribution Refrigerators Cryogenic Cooling Coolers Switches Computerized Simulation Cryogenic Temperature Electrical Resistivity Cryogenics Thermal Conductivity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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