Multistage phase change heat storage temperature stratification water tank

Abstract

The invention discloses a multistage phase change heat storage temperature stratification water tank which comprises a water tank body. A heat supply water inlet pipe is arranged at the bottom in the water tank body, a heat supply water outlet pipe is arranged at the top in the water tank body, and multiple phase change heat storage layers are arranged in the water tank body from top to bottom. Each phase change heat storage layer comprises a plurality of phase change units. The phase change temperatures of the phase change units on the same layer are the same, the phase change temperatures of the phase change units on different layers are different, and the phase change temperatures are sequentially reduced from top to bottom. A heating coil is further arranged below each layer of phase change units, fins are arranged on the heating coils close to the side of the water tank, a heating medium water inlet main pipe communicates with the heating coil on each layer through a heating medium water inlet pipeline extending into the water tank, meanwhile, an outlet of the heating coil on the upper layer communicates with an inlet of the adjacent heating coil on the lower layer, and an outlet of the heating coil on the bottommost layer communicates with a heating medium water outlet pipe which extends out of the water tank. Heat energy can be efficiently stored and utilized, heat is quickly stored and released, and the practicability is high.

Description

technical field [0001] The invention relates to the field of heat storage and heat release equipment, in particular to a multi-stage phase change heat storage temperature stratified water tank. Background technique [0002] With the advancement of social technology and the improvement of carbon emission requirements, more and more attention has been paid to the utilization of green renewable energy such as solar energy and waste heat. However, due to the intermittent nature, instability of energy and the contradiction between supply and demand, its efficiency is seriously restricted. The improvement and further popularization and application of heat storage device is an effective way to solve the bottleneck problem. In recent years, energy storage technology has been vigorously supported and developed. At present, common heat storage devices include sensible heat storage (such as hot water tanks), latent heat storage (ie phase change energy storage) and sensible latent heat ...

AI Technical Summary

Problems solved by technology

[0003] Although the existing phase-change hot water storage tanks combine the advantages of fast sensible heat storage rate and high latent heat storage density, they still cannot meet the actual needs. The main reasons are: ① Existing phase-change hot water storage tanks It is only suitable for places where the hot and cold fluids are the same medium, and its heat storage and heat release cannot be carried out at the same time, which limits its application range and poor versatility; ②The natural convection of water is not fully utilized in the design, so there is a phase change The heat transfer rate of the hot water storage tank is still low; ③In the existing phase change hot water storage tank, the heat medium flows through the same path. Therefore, it cannot be well adapted to places where the temperature of the heat source fluctuates greatly (such as the heat of solar thermal panels); ④ The existing phase change heat storage tank cannot achieve temperature layered storage, and the heat loss is large , the quality of thermal energy decreases, reducing the efficiency of heat exergy

[0004] In short, the existing phase-change hot water storage tanks have poor versatility, slow heat transfer rate, low energy utilization rate of effective heat source, and cannot store and utilize heat according to quality, resulting in waste of energy exergy and detrimental to the energy efficiency of the heat source side. improvement, etc.

[0005] Although the Chinese patent CN109140805A discloses a cage-type phase change heat storage tank, there are multiple phase change heat storage layers with different phase change temperatures in the tank, which are installed vertically from top to bottom according to the phase change temperature from high to low. , realize the temperature layered storage of the phase change water tank, but the heat storage and heat extraction rate is slow, and the utilization efficiency and utilization time of solar energy cannot be significantly improved, and it is not suitable for heat source temperature changes in a wide range Wait

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