Thermal engineering experiment thermal balance environment automatic control device and control method thereof

Abstract

The invention discloses an automatic control device and a control method thereof for a heat balance environment in a thermal experiment. The outer insulation layer outside the wire, the thermal compensation power supply supplying power to the thermal compensation wire, two thermocouples for collecting the temperature signal of the outer wall of the experimental pipe section and the outer wall of the inner insulation layer, and adjusting the thermal compensation according to the temperature signals collected by the two thermocouples The feedback circuit of the heating power of the wire, the thermal compensation power supply and the thermal compensation wire form a series loop, and the feedback circuit is connected to the series loop. The thermal compensation wire of the present invention adopts electric heating for thermal compensation, and the power of the thermal compensation wire can be automatically adjusted through the temperature of the outer wall of the experimental pipe section and the outer wall temperature of the inner insulation layer to achieve the thermal balance condition and realize the accurate measurement of the fluid heating power, which is further experimental data Accurate analysis provides a reliable guarantee, improving the accuracy and reliability of thermal experiments.

Description

technical field [0001] The invention relates to the technical field of thermal experiments, in particular to an automatic control device and a control method for a heat balance environment of a thermal experiment. Background technique [0002] Energy power, nuclear energy, refrigeration, petrochemical, aerospace and other industrial fields often encounter heat exchange between fluids on both sides of a solid wall. The study of this heat transfer process often relies on thermal experiments. Therefore, scientific research and Industrial design work often involves a large number of thermal experimental problems. How to obtain stable thermal equilibrium conditions during the experimental process is the key to obtaining accurate experimental results, and it is also the basis for further research on flow heat transfer laws and related physical mechanisms. Therefore, the research on heat balance analysis methods of thermal experiments is of great significance for improving experime...

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Problems solved by technology

[0004] At present, in order to keep the experimental body in a thermally balanced environment during the thermal experiment, the method of covering the thermal insulation layer is often adopted. The thermal insulation layer is made of a material with a small thermal conductivity. According to the knowledge of heat transfer, it can be reduced at this time. The heat dissipation between the experimental working fluid and the external environment makes most of the heat absorbed by the fluid. However, this experimental method obviously cannot obtain an absolute heat balance environment, and there are great differences in the heat dissipation under different experimental conditions. However, experimental devices that can provide a thermal equilibrium environment are still lacking.

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