Solar high-temperature phase change thermal storage device

A high-temperature phase change and heat storage device technology, which is applied in solar thermal devices, solar thermal power generation, heating devices, etc., can solve the problem of low thermal conductivity of inorganic salt high-temperature phase change materials, affecting the heating and heat release of phase change materials, and affecting the utilization of thermal energy. Efficiency and other issues, to achieve high temperature stability and repeatability, long service life, compact structure

Inactive Publication Date: 2012-03-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are great limitations in the design and development of heat storage and heat release by using phase change materials. For example, most of the existing researches are designed for low temperature phase change materials. is lower; heat storage and heat release are divided into two parts, the two parts are combined by heat conduction working fluid, the volume is large, and there is a lot of heat loss in the heat conduction process, this structure is difficult to store heat and release heat The process is efficiently combined; the thermal conductivity of inorganic salt high-temperature phase change materials is relatively low, which also seriously affects the entire process of heating and releasing heat of phase change materials, and affects the utilization efficiency of heat energy

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Small solar high temperature storage and heat release unit

[0028] 1) Specific specifications of each part:

[0029] (1) Metal shell, 500×600mm (outer diameter×height);

[0030] (2) Stainless steel conduit, outer diameter 100mm;

[0031] (3) Insulation material, thickness 100mm;

[0032] (4) Corundum container, thickness 5mm, outer diameter 296mm, height 398mm;

[0033] (5) Stainless steel fins with a thickness of 2 mm, a radius of 91 mm, and a fin spacing of 5 mm.

[0034] 2) Experimental process of design of stainless steel tubes and fins

[0035] The diameter of the stainless steel pipe, the thickness and spacing of the stainless steel fins directly affect the efficiency of heat conduction and the heat storage efficiency of the heat storage unit, and are key factors in the design process of the heat storage unit. To this end, the following experimental procedures were carried out:

[0036] (1) Determine the diameter of the stainless steel conduit

[0037] Sta...

Embodiment 2

[0042] Medium-sized solar high temperature storage and heat release unit

[0043] 1) Specific specifications of each part:

[0044] (1) Metal shell, 860×1000mm (outer diameter×height);

[0045] (2) Stainless steel conduit, outer diameter 120mm;

[0046] (3) Insulation material, thickness 100mm;

[0047] (4) Corundum container, thickness 30mm, outer diameter 600mm, height 720mm;

[0048] (5) Stainless steel fins with a thickness of 2 mm, a radius of 200 mm, and a fin spacing of 50 mm.

[0049] 2) Phase change material: graphite / inorganic salt high-temperature phase change heat storage composite material with a melting point of 600°C and a density of 2g / cm 3 , the phase change enthalpy is 500J / g. The total mass of the phase change material in this example is 2×10 5 kg, and the total phase change heat storage is 100MJ.

Embodiment 3

[0051] Large-scale solar high temperature storage and heat release unit

[0052] 1) Specific specifications of each part:

[0053] (1) Metal shell, 2000×5000mm (outer diameter×height);

[0054] (2) Stainless steel conduit, outer diameter 400mm;

[0055] (3) Insulation material, thickness 100mm;

[0056] (4) Corundum container, thickness 50mm, outer diameter 1780mm, height 4780mm;

[0057] (5) Stainless steel fins with a thickness of 30mm, a radius of 640mm, and a fin spacing of 30mm.

[0058] 2) Phase change material: graphite / inorganic salt high-temperature phase change heat storage composite material is used, with a melting point of 600°C, a density of 1.8g / cm3, and a phase change enthalpy of 500J / g. The total mass of the phase change material in this example is 8.6×10 3 kg, the total phase change heat storage is 4.3×10 3 MJ.

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Abstract

The invention relates to a solar high-temperature phase change thermal storage device. The device consists of a metal shell, a stainless steel tube, a corundum container and fins, wherein the metal shell has a cylindrical structure, and the upper end face and the lower end face of the metal shell are provided with round holes; the stainless steel tube is positioned in the middle of the metal shell and passes through the round holes on the upper end face and the lower end face of the metal shell; the corundum container is sleeved in the middle of the stainless steel tube; and the fins are arranged in the corundum container. Compared with the prior art, the solar high-temperature phase change thermal storage device can make full use of solar energy, meets various energy demands of high temperature, medium temperature and low temperature, has relatively high efficiency, a compact structure, high leakproofness, high-temperature stability and repeatability and long service life, can reasonably utilize energy and thermal storage systems, and can output a working medium at constant temperature.

Description

technical field [0001] The invention relates to the technical field of high-temperature phase-change energy storage materials, in particular to a solar high-temperature phase-change heat storage device. Background technique [0002] With the rapid development of global industry, the rapid growth of population, the human demand for energy is increasing day by day. At the same time, the problems of mineral energy depletion and environmental pollution are becoming more and more prominent. Now the waste of energy in production and life is very serious. However, human beings cannot effectively utilize energy in nature (such as solar energy), so the energy crisis is becoming more and more severe. [0003] In recent years, the utilization of solar energy has been paid more and more attention by people. However, due to natural phenomena such as the alternation of day and night, cloudy, sunny, rainy and snowy, etc., the discontinuity and volatility of solar energy lead to a mismatch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D20/02F24J2/46C09K5/06
CPCY02E10/40Y02E60/14Y02E70/30
Inventor 张东李月锋
Owner TONGJI UNIV
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