A measuring system and method for measuring thermal conductivity of circular tube materials
A technology of thermal conductivity and measurement system, which is applied in the field of thermal conductivity measurement system of circular tube materials, which can solve the problems of thermal conductivity variation and inconvenient measurement of tubular samples, etc.
Active Publication Date: 2019-12-20
XI AN JIAOTONG UNIV
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Problems solved by technology
However, these methods require flattening of the sample to be tested. In engineering practice, it is extremely inconvenient to measure tubular samples, and reprocessing of tubular samples usually leads to changes in thermal conductivity.
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[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0031] Such as figure 1 As shown, it includes a thermal insulation fixture 5, a Hot Spring sensor 6, a data acquisition device 4 and an incubator 7. Among them, the data acquisition equipment 4 and the Hot Spring sensor 6 are the main parts of the thermal conductivity measurement, and the heat insulation fixture 5 and the thermostat 7 are the main parts of the temperature control.
[0032] see figure 2 , the heat insulating fixture 5 is a heat insulating fixing device composed of an alumina ceramic shell and an insulating heat insulating layer. In order to meet the requirements of insulation and heat insulation, in this implementation example, the thermal conductivity of the alumina ceramics used is less than or equal to 8W / (m·K), and the resistivity is greater than or equal to 10 18 Ω·m. In engineering practice, the thermal conductivity of the r...
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Abstract
The invention discloses a circular-tube material heat conductivity coefficient measuring system and a measuring method thereof. A heating unit comprises a hot spring sensor and a heat insulation clamp, a heat preservation unit comprises an air-bath constant-temperature oven, corresponding thermometers and a heat controller, a measuring unit comprises a data acquisition device, a measuring circuit, a heat control device and an electric-potential measuring device, the heat control device and the electric-potential measuring device are connected with the hot spring sensor, and a calculation unit calculates heat conductivity coefficients of circular-tube materials to be measured according to heating capacity and heat-electric-potential time response data of the hot spring sensor. The measuring method is based on measuring principles of a transient heat source method, the hot spring sensor is arranged on the outer surface of a circular tube, serves as a heating element and also serves as a temperature measuring element, current generates heat through metal wires in the hot spring sensor, so that a circular tube to be measured is heated, temperature time response data of the sensor are analyzed, and the heat conductivity coefficient of the circular-tube materials can be calculated.
Description
technical field [0001] The invention belongs to the field of measurement of solid thermophysical properties, and relates to a measurement system and a method for measuring thermal conductivity of circular tube materials. Background technique [0002] In recent years, with the rapid development of the world economy, the problem of energy shortage has become increasingly serious, and energy conservation in various industrial fields has gradually become a research hotspot. my country has a vast territory, and many developed cities are located in temperate and sub-frigid zones. How to solve the problem of building energy conservation in these cities has far-reaching significance for alleviating regional energy shortages. Steel structure round pipe is not only an important basic structural material in HVAC design in the construction field and other industrial fields, but also the most commonly used structural material in the energy transfer process. Thermal conductivity is an im...
Claims
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IPC IPC(8): G01N25/48
CPCG01N25/4846G01N25/4853G01N25/486
Inventor 何茂刚辛楠张诗张颖刘向阳
Owner XI AN JIAOTONG UNIV