Multi-probe transient radiant heat flow meter and method for measuring heat radiant heat flux

Abstract

The invention discloses a heat flow meter for rapid response non-contact measurement of heat flux density, which includes a multi-sensitive surface measuring head, a heat sink body, a heat sink body temperature measuring thermocouple, a data acquisition device, a data processing and display device, and according to different absorption Two identical materials with the same intensity, when subjected to the same intensity of radiant heat flow, have different temperatures, establish the relationship between the radiant heat flux density and the temperature difference between the two sensitive surfaces, and at the same time avoid system errors, and develop a method that can satisfy the space It can be used in a technical vacuum environment, and can also be used in a convective environment on the ground. It has a simpler structure and can work continuously. It can be connected in series to form a thermopile to increase the temperature difference thermoelectric potential and reduce the error in the measurement. It is a high-precision transient radiation heat flow meter. .

Description

technical field [0001] The invention relates to a multi-probe transient radiation heat flow meter for measuring various heat radiation heat flux densities of steam boilers, soaking furnaces, heat transfer pipes, and space heat radiation, and the measurement of heat radiation heat flux density using the heat flow meter method. Background technique [0002] Radiation heat flow meters have important applications in many fields such as solar energy, space technology, meteorology, industry, metallurgy, energy, power, air conditioning, etc. The theory and technology of heat flow detection have attracted more and more attention. The currently used full radiation heat flow meters are divided into heat conduction steady-state heat flow meters and lumped heat capacity heat flow meters, both of which are designed based on the principle of heat balance. In order to improve the measurement accuracy of fluctuating radiant flow, research on high-precision transient radiant heat flowmeter ...

AI Technical Summary

Problems solved by technology

The first one is to obtain the radiant heat flow by establishing the relationship between the temperature change of the sensitive surface and the radiant heat flow, but the temperature change of the sensitive surface is not directly measured by the sensitive surface itself, but it must be carried out by using other thermocouples, so that the thermocouple There is a heat conduction process between the copper sheet and the copper sheet. In order to compensate the dynamic error between the temperature measured by the thermocouple and the real temperature of the copper sheet due to time delay when the radiation heat flow changes suddenly, the data processing usually needs to be compensated, which will affect Measurement error and response time

The second type, the round foil transient heat flow meter, transfers heat through the contact between a single constantan sensitive surface and the copper heat sink, and establishes the relationship between the heat flow and the temperature gradient of the sensitive surface, but the contact area is large, and the temperature rise of the heat sink will affect To the measurement results, it is not conducive to working for a long time

The third type, the adiabatic transient heat flow meter, is designed to track the temperature change of the sensitive surface, so that the sensitive surface and the tracking surface maintain the same temperature, and establish the relationship between the radiation heat flow and the tracking heating amount. This method is beneficial to long-term measurement. However, the structure is more complex, and there are many factors affected by interference

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