Heat exchanger and water heater

Abstract

The invention provides a heat exchanger and a water heater. The heat exchanger comprises a shell, shell, a heat exchange tube, phase-change materials and fans. The heat exchange tube is arranged on the shell in a snakelike mode, the heat exchange tube is provided with a water inlet and a water outlet. The phase-change materials are arranged in the shell. The fins are uniformly distributed in the shell, and the heat exchange tube penetrates through the fins. The spacing between tube bundles of the snakelike heat exchange tube decreases gradually from the water inlet to the water outlet. According to the heat exchanger, the phase-change materials are arranged in the shell, the spacing between the tube bundles of the snakelike heat exchange tube decreases gradually from the water inlet to thewater outlet, the area of contact between the phase-change materials and the heat exchange tube at the position of high water temperature is small, and thus the transferred heat is reduced; and at the position of low water temperature, the area of contact between the phase-change materials and the heat exchange tube becomes larger, thus the transferred heat is increased, so that the phase-changematerials are completely melted / solidified at the same time in each zone separated by the heat exchange tube, the heat transfer efficiency of phase-change materials is improved, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a heat exchanger and a water heater. Background technique [0002] At present, in household electric water heaters, the use of phase change material heat exchangers to replace water tanks can not only greatly reduce the volume of electric water heaters, but also avoid dead water areas in water tanks, reduce the generation of scale, and increase users' hygiene and health experience. [0003] In related technologies, on the one hand, finned tube heat exchangers used in air conditioners or refrigerators are completely standardized heat exchange components, that is, parameters such as tube diameter, tube spacing, fin thickness, fin shape, and fin density are all Standard serialized. The heat exchange medium of this type of finned tube heat exchanger is refrigerant and air, and the heat exchange between refrigerant and air is carried out by natural convection or forced c...

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Problems solved by technology

[0004] On the other hand, finned tube heat exchangers applied to phase change materials (that is, the channel inside the tube is water, and the phase change material is filled outside the tube. At the same time, in order to make the heat exchange of the phase change material more sufficient, fins are used to enhance heat exchange ), the heat exchange between water and phase change materials is mainly based on heat conduction (that is, solid phase phase change materials completely rely on heat conduction to transfer heat, and liquid phase materials with high viscosity not only conduct heat transfer by convective heat exchange, but also conduct heat by heat conduction Mainly), if the design is carried out with reference to the finned tube heat exchanger of the refrigerator or air conditioner, large errors will inevitably occur, and even the designed heat exchanger cannot meet the heat transfer performance requirements

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