Online Duvel whole temperature interval cold loss measuring method

Abstract

The invention discloses an online Duvel whole temperature interval cold loss measuring method. By means of the method, a function relation between Duvel cold end temperature change, radiation heat leakage and transfer heat leakage is utilized to conduct numerical fitting on a temperature change curve of the cold end, and a cold loss expression can be exported in a reversed mode. The method overcomes the shortcoming that radiation heat leakage and transfer heat leakage cannot be obtained respectively in the common liquid nitrogen weighting method or the standard refrigerator calibration method, only a total cold loss value can be obtained, and measurement cannot be conducted in the state where a refrigerator is coupled. The method achieves the effect that radiation heat leakage and heat transfer heat leakage can be measured simultaneously under the condition that the original coupling state is not damaged, heat leakage of the Duvel cold end under all temperature points can be obtained, and the method provides an effective measuring means for heat design and heat failure analysis of Duvel.

Description

technical field [0001] The invention relates to a Dewar technology, in particular to a method for online measurement of the cold loss of the Dewar in the full temperature range. The method can obtain the radiation leakage of the Dewar at each temperature point without changing the coupling state of the Dewar. heat, conduction heat leakage, and total heat leakage. Background technique [0002] Cold loss is an important parameter of Dewar. The heat transfer methods mainly include radiation heat transfer, heat conduction heat transfer and convective heat transfer. Because it is vacuum packaged, convective heat transfer is generally very small in Dewar and is often ignored. Therefore, in Dewar In the heat leakage of tiles, usually only radiation heat leakage and heat conduction heat leakage are considered. Usually, the measurement method of cold loss cannot give the radiation heat leakage and heat conduction heat leakage respectively, and can only obtain a total cold loss value...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a full-state on-line measurement method for Dewar cold loss, which solves the problem in the prior art that it can only be measured when the Dewar is not coupled with the refrigerator, and cannot separately measure radiation heat leakage and conduction. Heat Leakage Technical Issues

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