Circular heat transfer method and set with phase change heat medium

Abstract

The invention relates to a circulating heat transfer method of heat medium phase change, which comprises placing liquid-phase heat medium in connected liquid storage pipes and evaporation pipes; simultaneously heating the liquid-phase heat medium in the evaporation pipes and liquid storage pipes, and the thermal conductivity of the evaporation pipes Greater than the thermal conductivity coefficient of the liquid storage pipe, the temperature difference between the liquid-phase heat medium in the evaporation tube and the liquid-phase heat medium in the liquid storage pipe is generated. When the temperature of the liquid-phase heat medium is equal to or greater than the vaporization temperature, the phase change of the liquid-phase heat medium in the evaporator tube The gas-phase heat medium evaporates upwards, and there is a phase change temperature difference between the liquid-phase heat medium in the liquid storage tube and the liquid-phase heat medium in the evaporation tube; the liquid-phase heat medium in the liquid storage tube enters the evaporator tube; In the condensing pipe of the heat exchanger, the liquid-phase heat medium transformed from exothermic condensed phase automatically flows into the lower liquid storage pipe under the action of its gravity, and the potential energy generated by the downward-flowing liquid-phase heat medium is used as the circulation power of the heat medium. The invention has the characteristics of realizing large flow without external power, long-distance heat transfer, simple heat transfer system, low cost and stable thermal efficiency.

Description

technical field [0001] The invention relates to a thermal energy transmission technology, in particular to a method and a device for circularly transmitting thermal energy through phase change of a thermal medium. Background technique [0002] As we all know, in the thermal energy supply system, heating equipment such as volumetric water heaters, rapid water heaters, gas heaters, electric water heaters and solar water heaters are needed to heat the liquid. The above-mentioned heating equipment utilizes the density change of water after being heated to realize convective heat transfer, but this convective heat transfer has defects such as low heat exchange convection speed and slow circulation speed. Therefore, when it is used for heating with a large flow, it is necessary to increase the heat exchange area to meet the use requirements, which will inevitably require a huge heating equipment. Furthermore, the above-mentioned heating equipment and heat exchange method directly...

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Problems solved by technology

Furthermore, the above-mentioned heating equipment and heat exchange method directly heat the liquid and transmit the liquid. Due to the large flow resistance of the liquid and the slow circulation speed, when it is necessary to transmit heat energy over a long distance, an external power must be added to realize heat energy through the external power. However, a series of control systems are required, which not only increases the complexity of the heat supply system, but also increases the manufacturing cost and use cost, which brings inconvenience to the maintenance of the heat supply system and reduces the heat supply. system reliability

In addition, the heat energy transmission in the heating system is transported and circulated with the liquid phase fluid as the heat transfer medium. Due to the large flow resistance of the liquid, the flow of the liquid is reduced by reducing the number of elbows during the layout of the heat transfer system. Resistance and loss, the construction operation is greatly restricted, which increases the complexity of the construction

Furthermore, it is to heat, transport and use the liquid in the pipe, not as a circulating heat medium. When directly heating water, due to the different water quality in different regions, the calcium, magnesium, and salt in the water will increase with the increase of water temperature. The solubility of carbon dioxide is reduced, and it is easy to form scale and deposit on the conveying pipe, which reduces the thermal conductivity and transmission capacity of heat energy, affects the heat transfer efficiency, and also accelerates the corrosion of the conveying pipe and shortens the service life.

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