Method and device for detecting apparent thermal conductivity of thermal insulation material

By controlling the temperature of the cold cavity with a refrigeration unit and comparing the differences in the cooling capacity of the cold head, the heat flux of the insulation material can be indirectly measured. This solves the safety and error problems in the existing technology for testing the apparent thermal conductivity of insulation materials, and achieves a simple and accurate testing result.

CN117233205BActive Publication Date: 2026-06-19ZHEJIANG UNIV
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2023-09-13
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies for testing the apparent thermal conductivity of insulation materials suffer from safety issues related to the use of cryogenic liquids, high costs, and uncontrollable cold-end temperatures. Furthermore, the heat measurement method using heat-conducting rods has significant errors.

Method used

A device and method for detecting the apparent thermal conductivity of insulation materials are proposed. The temperature of the cold cavity is controlled by a refrigeration unit. By comparing the difference in cooling capacity of the refrigeration unit's cold head when the insulation material is wrapped in the cold cavity, the heat flux of the insulation material is indirectly characterized, avoiding errors caused by the use of cryogenic liquids and the calibration process.

Benefits of technology

It enables a simple, safe, and accurate test of the apparent thermal conductivity of insulation materials, avoiding the safety and cost issues of cryogenic liquid testing, reducing errors in the calibration process, and improving the accuracy of the test.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117233205B_ABST
    Figure CN117233205B_ABST
Patent Text Reader

Abstract

This invention discloses a device for detecting the apparent thermal conductivity of insulation materials, comprising: a detachable cold cavity, into which the insulation material to be tested can be wrapped during testing; a first refrigerator that provides cooling to the cold cavity, the cold head of which is connected to the cold cavity via a thermal bridge; a vacuum chamber, in which the cold cavity and the cold head of the first refrigerator are installed; a temperature measuring element for detecting the temperature of the cold head of the first refrigerator, the cold cavity, and the outer surface of the insulation material; and a temperature controller for adjusting and maintaining the cold cavity and the cold head of the refrigerator at a preset temperature. This invention indirectly characterizes the apparent thermal conductivity of multilayer materials by using the difference in cooling capacity of the refrigerator under conditions of connecting and unconnecting the insulation-wrapped cold cavity. This method is simple to operate, eliminates the need for cryogenic liquids, avoiding the safety and cost issues associated with cryogenic liquid testing; and eliminates the need for material calibration, avoiding potential errors from the calibration process.
Need to check novelty before this filing date? Find Prior Art