Alternating magnetic field based phase change heat accumulation enhancing device and operation method thereof

Abstract

The invention discloses an alternating magnetic field based phase change heat accumulation enhancing device and an operation method thereof. The alternating magnetic field based phase change heat accumulation enhancing device comprises a first electromagnet, a second electromagnet, a power supply, a cyclic delay relay, a heat accumulator shell, a phase change material, magnetic particles, a heat transfer fluid channel, a heat transfer fluid inlet and a heat transfer fluid outlet. Through the alternating magnetic field based phase change heat accumulation enhancing device, when the phase changematerial accumulates heat or releases heat, the first electromagnet and the second electromagnet operate alternately under the action of the power supply and the cyclic delay relay to pull the magnetic particles to move up and down on a solid-liquid interface and a liquid-stage interval to transfer heat, and meanwhile, the magnetic particles drive the liquid-stage phase change material to conductforced convection. The alternating magnetic field based phase change heat accumulation enhancing device enhances the phase change process of the phase change material from the two aspects of heat conduction and flowing and can remarkably increase the phase change rate of the phase change material.

Description

technical field [0001] The invention relates to the field of heat exchange design enhancement, in particular to a phase change heat storage enhancement device based on an alternating magnetic field and an operating method thereof. Background technique [0002] With the rapid economic development of the current society, the energy crisis caused by the depletion of fossil energy is also gradually reflected, and the voice of increasing the proportion of renewable energy utilization is also getting louder. Renewable energy represented by solar energy and wind energy has the characteristics of discontinuous sources, so energy storage devices need to be configured in practical applications. [0003] Phase change materials have the advantages of high heat storage density, constant heat release temperature, good cycle stability and simple control, and can be widely used in solar heat storage, industrial waste heat utilization, building heat recovery and other fields. However, the t...

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Problems solved by technology

The promotion effect of natural convection on the melting / solidification process of phase change materials is relatively significant, but the existing phase change strengthening technologies limit the convection of liquid phase change materials to a certain extent while improving heat conduction, restricting its enhanced phase change. Effect

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