Multi-measuring-head transient radiation heat flow meter and measuring method for thermal radiation heat flow density

Abstract

The invention discloses a quick-response heat flow meter for non-contact measurement of heat flow density. The heat flow meter comprises multi-sensitive-surface measuring heads, a heat sink body, a heat sink body temperature thermocouple, a data acquisition device and a data processing and displaying device. As the temperatures of two identical materials with different absorption rates are different under the action of radiation heat flows with the same intensity, the temperature difference relations between radiation heat flow density and two sensitive surfaces are established. Meanwhile, system errors are further avoided. Accordingly, the developed high-accuracy transient radiation heat flow meter has the advantages that the heat flow meter can meet space technology requirements and be used in a vacuum environment and can also be used in a ground convection environment; the heat flow meter is simpler in structure; the heat flow meter can work continuously and can be connected in series to form a thermopile so that temperature difference thermoelectric force can be increased, and errors in the measuring process are reduced.

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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