Phase change energy storage type water heating system and control method thereof

Abstract

The invention provides a phase change energy storage type water heating system and a control method thereof. The phase change energy storage type water heating system comprises a refrigerant compression device with a first compression part, a first four-way valve, a first water use side heat exchanger, a first electronic expansion valve, a first check valve, a second electronic expansion valve anda third heat exchanger and further comprises a phase change energy storage device, wherein the refrigerant compression device, the first four-way valve, the first water use side heat exchanger, the first electronic expansion valve, the first check valve, the second electronic expansion valve and the third heat exchanger are sequentially connected through pipelines. A phase change heat exchanger is arranged in the phase change energy storage device. All openings in the first four-way valve communicate with an exhaust opening and an air suction opening of the first compression part, the first water use side heat exchanger and the phase change heat exchanger correspondingly. The other end of the phase change heat exchanger is connected between the first check valve and the second electronicexpansion valve. By means of the phase change energy storage type water heating system and the control method thereof, the separate design of the phase change energy storage device and the water use heat exchanger is adopted, the water use safety of the system is improved while the advantage of high energy storage density of phase change energy storage utilized and the heat exchange energy efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of phase change heat storage, and in particular relates to a phase change energy storage hot water system and a control method thereof. Background technique [0002] Air source heat pump water heaters have been widely promoted and applied due to their energy saving, environmental protection, and safety features. Restricted its further popularization and use. In order to solve the aforementioned shortcomings, researchers have made necessary improvements on the basis of traditional air source heat pump systems. For example, applying phase change energy storage technology to air source heat pump water heaters can use the latent heat of phase change materials to store and release heat. Due to the high heat storage density of the heat storage material and the relatively stable phase change temperature, the phase change heat storage water heater has the advantages of high energy storage density, small volume, and...

AI Technical Summary

Problems solved by technology

In terms of specific operation, in the prior art, a corresponding phase change energy storage tank is installed on the basis of the air source heat pump hot water system. The water pipe is filled with phase change energy storage material between the refrigerant pipe and the water pipe, thereby realizing the thermal coupling (heat transfer) process between the refrigerant-phase change energy storage material-water, and in the prior art, in order to improve the phase change energy storage The energy storage density and heat transfer efficiency of the energy storage materials often use composite phase change energy storage materials with inorganic salts as the main material. Leakage causes phase change energy storage materials to penetrate into domestic water, causing water safety hazards, and the application of phase change thermal storage technology in heat pump hot water systems is not yet mature. At the same time, since the refrigerant pipe and the water pipe are installed in the phase change energy storage tank in the prior art, the energy efficiency of the heat exchange energy storage is limited (the heat dissipation area is reduced) in the case of a certain size, how to Utilizing the advantages of high energy storage density of phase change heat storage technology, improving the energy efficiency of heat exchange and at the same time improving the safety of water used in the system has become an urgent problem to be solved. Based on this, the present invention is proposed

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