Hierarchical phase-change hot water storage tank

Abstract

The invention provides a hierarchical phase-change hot water storage tank which comprises a tank body, an upper cover, a phase-change heat storage device, a first coil pipe assembly, a second coil pipe assembly, a water inlet mouth, a water outlet pipe and a water outlet mouth, wherein the upper cover is in sealed connection with the tank body; the phase-change heat storage device is arranged at the inner upper part of the tank body; the first coil pipe assembly is used for heating water and horizontally arranged; the second coil pipe assembly is used for preliminarily heating water and converting a refrigerant from gas into a liquid, and horizontally arranged; the air inlet mouth is arranged at the lower part of the tank body; the water outlet pipe is arranged in the tank body; the water outlet mouth is arranged on the tank body and connected with the external end port of the water outlet pipe; the phase-change heat storage device, the first coil pipe assembly and the second coil pipe assembly are arranged in the tank body from top to bottom; and when the hierarchical phase-change hot water storage tank is in use, water in the tank body is naturally divided into a low-temperature-layer area, a high-temperature-layer area and a heat storage area. The hierarchical phase-change hot water storage tank provided by the invention is not large in overall size, high in heat exchange efficiency, high and relatively stable in water outlet temperature, and good in user experience.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a hierarchical phase-change hot water storage tank for the water heater. Background technique [0002] As important renewable clean energy, solar energy and air energy have been paid more and more attention to their development and application. Solar water heaters, especially vacuum tube solar water heaters, have developed relatively mature technology and have been industrialized on a large scale, but the biggest shortcoming of solar water heaters is that they must be used well during the day when there is sunlight; at present, combining solar energy with air energy Combined water heaters are also used. The principle is to transfer solar energy and / or air heat energy in the atmospheric environment to the refrigerant through a heat exchange device, and use a compressor (heat pump) to make the high-temperature and high-pressure refrigerant flow in the water heater tank. The flow in th...

AI Technical Summary

Problems solved by technology

The current disadvantages of this type of water heater are: First, the outlet water temperature of the water heater is generally in the medium temperature range of 65°C. In order to meet the daily water supply needs, the volume of the water tank is often large. Large; the reason for the low outlet water temperature is mainly limited by the critical temperature of the refrigerant. The condensing temperature of the refrigerant cannot be too high, and at the same time it cannot exceed the limit pressure of the compressor. Therefore, the outlet water temperature cannot be too high; in order to solve the condensation temperature, multiple water tanks may be required

[0003] At present, adding phase change media to energy storage in the above-mentioned types of solar energy, air energy or water heaters combining solar energy and air energy has been widely studied. energy heat pump water heater", another example is the application publication number CN 104180521A, the name is "a nano-phase change energy storage heat pump water heater", another example is the application publication number CN 103615817A, the name is "a plug-in phase change heat storage "Water Tank" and other Chinese patent documents disclose various water heaters that use phase change materials to store heat. The common problem is that due to the design of components such as the device for placing phase change materials inside the water tank, the coils for heat exchange, and the water tank Insufficient overall internal layout makes it have problems such as low outlet water temperature of the water tank, low heat conversion efficiency, uneven cooling and heating of the water in the water tank due to uneven heating of the water in the water tank, and poor user experience.

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