Device and method for measuring thermal conductivity of vacuum glass

Abstract

A thermal conductivity measuring device for vacuum glass, comprising an upper casing, a lower casing, a cold plate, a hot plate, a vacuum system and a control system, the cold plate and the hot plate are arranged in the upper casing and the lower casing, and the vacuum glass to be measured is placed in the Between the cold plate and the hot plate; after the upper shell and the lower shell are closed, the interior is pumped into a high vacuum through the vacuum system, and the high vacuum is used to obtain better thermal insulation performance than vacuum glass and provide standard correction; measure the hot plate by reading The constant temperature power, effective area and the constant temperature of the hot plate and the cold plate can be used to calculate the thermal conductivity of the vacuum glass measured; or by reading the constant temperature power required by the hot plate when measuring the vacuum glass and the calibration standard plate respectively, And by using the calculated thermal conductivity value of the calibration standard plate, the accurate thermal conductivity value of the vacuum glass can be directly obtained. The measuring device can solve the problem of heat dissipation of the measuring hot plate and the problem of providing a calibration standard plate, and has the characteristics of simple structure, convenient measurement and accurate data.

Description

Device and method for measuring thermal conductivity of vacuum glass technical field [0001] The present invention relates to a measuring device, in particular to a thermal conductivity measuring device and method of a vacuum glass. Background technique Vacuum glass is one of the best energy-saving glass, and its thermal insulation performance is generally represented by the heat transfer coefficient. The thermal coefficient can be obtained from thermal conductivity. Since the heat transfer coefficient of vacuum glass is very small, the existing thermal conductivity meter is used to measure the When measuring, the error is very large. For example, when the heat transfer coefficient is less than 1, the measurement error is ±0.1. The thermal coefficient can be as small as 0.2, in which case the error of existing thermal conductivity meters is unacceptable. Although there are many Device and method for measuring heat transfer coefficient of vacuum glass, such as patent...

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Problems solved by technology

Since the heat transfer coefficient of vacuum glass is very small, the error is very large when measured with an existing thermal conductivity meter. For example, when the heat transfer coefficient is less than 1, the measurement error is ±0.1. Theoretically, the heat transfer coefficient of vacuum glass The coefficient can be as small as 0.2, in which case the error of existing thermal conductivity meters is unacceptable

Although there are many devices and methods for measuring the heat transfer coefficient of vacuum glass in the prior art, such as patent applications CN02243245.0, CN200320126692.1, CN200620131674.6, CN200710003450.6, CN201210017369.4 and CN201210111168.0, etc., but for the same thickness For thermal insulation materials, the thermal conductivity of vacuum glass is the smallest, and it is difficult to find a better thermal insulation panel than vacuum glass, so the above devices and methods cannot solve the problem of measuring the heat dissipation of the thermal panel and provide a known accurate heat transfer coefficient or heat dissipation. Therefore, it is difficult to accurately measure the heat transfer coefficient of vacuum glass in the existing technology

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