Abstract
In a typical pulse tube cryocooler application, modeling the cool-down dynamics of a load attached to the cold tip require knowledge of the transient cooling power. Although this data may be calculated for in-house developed cryocoolers, the only data provided in commercial off-the-shelf cryocoolers is the steady state cooling power. In this paper, we show a systematic approach to derive transient cooling power data by performing heating and cooling experiments. The data obtained is verified with cooling data of an attached mass, which showed a good agreement. We also present a method to determine the parasitic heat load in a steady and transient operation of a commercial pulse tube cryocooler.
Highlights
The usage of cryocoolers once a workhorse for detector technology is branching into new application areas
The objective of this paper is to show an experimental approach to determine the transient cooling power and parasitic heat leaks of a
We presented a systematic approach to determine key operational parameters of a commercial off-the-shelf pulse tube cryocooler
Summary
The usage of cryocoolers once a workhorse for detector technology is branching into new application areas. The cool-down characteristic is a plot of temperature measured at the cold heat exchanger as a function of time. The details such as the cold heat exchanger mass, transient cooling power, other internal geometry, and material parameters are often not provided as it is proprietary information of the manufacturer. In a typical application using the steady-state cooling power values to determine the cool-down time of a mass attached to the cold-end will lead to a significant error. The procedure adopted to determine the effective area is as follows; First, the cooler is allowed to attain a steady-state cold tem perature.
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