Abstract
We present the current state of development in passive gas-gap heat switches. This type of switch does not require a separate heater to activate heat transfer but, instead, relies upon the warming of one end due to an intrinsic step in a thermodynamic cycle to raise a getter above a threshold temperature. Above this temperature sequestered gas is released to couple both sides of the switch. This enhances the thermodynamic efficiency of the system and reduces the complexity of the control system. Various gas mixtures and getter configurations will be presented.
Highlights
Refrigeration cycles in cryogenic coolers often need a method to control the flow of heat throughout the system. This may be done with a valve or other mechanism to make or break a thermal connection between components within the system and a heat sink. These heat sinks may be a bath of liquid cryogen, a cryocooler cold tip, or another cryogenic stage within a multistage system
An active switch is one where the control system must explicitly initiate a change in the switch state
If the temperature of a cryogenic stage is commanded to change, a passive switch may react to this temperature change
Summary
Refrigeration cycles in cryogenic coolers often need a method to control the flow of heat throughout the system. Superconducting Switches This type of switch relies upon a change in conduction when a metallic element internal to the switch transitions from the normal to superconducting state.
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