Single tank phase change thermal storage device for solar energy

Abstract

The invention belongs to the field of solar energy, relates to the solar-thermal energy thermal storage technology, and in particular relates to a single tank phase change thermal storage device for solar energy. The single tank phase change thermal storage device is characterized in that a respiration port, a thermal storage medium inlet, a upper cover, a thermal storage medium outlet and a thermal storage medium discharge gate are arranged on the tank body, a polycyclic multilayer heat exchange coil is arranged in the tank body, and the polycyclic multilayer heat exchange coil is connected between a heat-transfer medium outlet pipe arranged on the upper end of the heat exchange coil and a heat-transfer medium inlet pipe arranged on the lower end of the heat exchange coil in parallel, thus forming a heat-transfer medium circulation pipeline; a thermal storage chamber of the tank body, which contains the thermal storage mediums, is enclosed by the inner wall, the upper cover and the thermal storage medium discharge gate; a sealed heat insulation sandwich is composed of the inner wall of the storage tank and the outer wall of the storage tank; and a thermometer is arranged in the tank. The device disclosed by the invention has the advantages that the phase change thermal storage technology is adopted to enable the thermal storage density to be improved greatly, and the thermal storage volume is efficiently reduced on the premise of same thermal storage capacity; and the storage and release processes of the phase change materials heat are carried out in the same device, thus simplifying the structure of thermal storage device efficiently, and reducing the cost.

Description

technical field [0001] The invention belongs to the field of solar energy, and relates to solar thermal energy heat storage technology, in particular to a solar single-tank phase-change heat storage device. Background technique [0002] Solar energy refers to the radiant energy of the sun. The main utilization forms of solar energy are photoelectric conversion, photothermal conversion and photochemical conversion of solar energy. Solar photovoltaic power generation converts solar radiation into electrical energy through photoelectric conversion; solar thermal utilization uses solar radiation to heat water, or generates steam to provide steam for industrial process heat or steam turbine power generation. In summary, solar energy has the following advantages: (1) Universal: the sun shines on the earth, without geographical restrictions, no matter land or sea, no matter mountains or islands, it is everywhere, can be directly developed and utilized, and does not need to be mine...

AI Technical Summary

Problems solved by technology

However, as a clean renewable energy source, solar energy also has the following disadvantages in practical applications: (1) Dispersion: Although the total amount of solar radiation reaching the earth's surface is large, the energy flux density is very low

Therefore, when using solar energy, if you want to obtain a certain conversion power, you often need a set of collection and conversion equipment with a relatively large area, and the cost is relatively high.

(2) Instability: Due to the limitation of natural conditions such as day and night, season, geographical latitude and altitude, as well as the influence of random factors such as sunny, cloudy, cloud and rain, the solar irradiance reaching a certain ground is intermittent However, it is extremely unstable, which makes the large-scale application of solar energy more difficult.

However, the existing patented technology may have poor stability and safety under high temperature and high pressure, or there are defects such as storing phase change heat storage materials in pipelines for safety reasons, so that the heat storage capacity is very limited.

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