Title:
Application of New Figures of Merit for Multi-Stage Cryocoolers
Application of New Figures of Merit for Multi-Stage Cryocoolers
Files
Author(s)
Delmas, J.
Kadin, A. M.
Webber, R. J.
Track, E. K.
Kadin, A. M.
Webber, R. J.
Track, E. K.
Advisor(s)
Editor(s)
Collections
Supplementary to
Permanent Link
Abstract
Evaluation of the overall performance of a multi-stage cryocooler, including the cooling power available on the intermediate stages, is not trivial, but is necessary to choose or design efficiently a cooler for a defined application. We have recently proposed two simple definitions of electrical “figures of merit” (FoM) for multi-stage cryocoolers that represent the distributed refrigeration power for applications where heat-sinking of power and signal leads at intermediate stages is available. These FoMs are designed to have universal applicability and to convey the relative performance of such cryocoolers in a much more effective manner than simple weighted averages based on the coefficient of performance (CoP) of the various stages. We demonstrate the utility of these FoMs by applying them to a four-stage cryocooler over a broad range of temperatures, enabling us to determine the optimal operating temperature and heat lift of each stage of the cooler. We also show, using properties of a real superconducting electronic system operating at 4 K, how these FoMs can be used to help in the specification and design of an improved multi-stage cryocooler to fit efficiently the needs of such a system.
Sponsor
Date Issued
2008-05
Extent
Resource Type
Text
Resource Subtype
Proceedings