CN104896984B - A kind of solar energy aids in paddy energy phase transformation regenerative apparatus - Google Patents

Abstract

The invention discloses a solar energy assisted valley energy solid phase change heat storage device, comprising a solar photovoltaic device, an electrical storage device, a temperature control device, a phase change heat preservation structure and a heat storage solid, and the heat storage solid is arranged on the phase change heat preservation structure Inside, the solar photovoltaic device is connected to the phase change heat preservation structure through the power storage device, the signal input end of the temperature control device is connected to each layer of the phase change heat preservation layer of the phase change heat preservation structure, and the signal of the temperature control device The output terminal is connected with the signal input terminal of the power storage device. The invention uses the solar energy to assist the valley energy solid phase change heat storage device, and according to the different needs of the users, it can continuously meet the thermal environment required by the users for a long time.

Description

A solar energy assisted valley energy solid phase change heat storage device

technical field

The invention belongs to the field of environmental protection energy storage, and in particular relates to a solar-assisted valley energy solid phase change heat storage device.

Background technique

With the change of my country's industrial structure and the improvement of people's living standards, the peak power consumption during the day continues to increase, and the power consumption during the night trough period decreases sharply. Economic losses. Vigorously promoting electric heat storage energy storage devices operating in low valleys is an effective way to "cut peaks and fill valleys". Moreover, the solid heat storage energy storage device not only overcomes the shortcomings of traditional heat storage methods, but also has many advantages such as environmental protection, high efficiency, energy saving, and safety, and is expected to replace some traditional heating equipment.

The current solid heat storage technology mostly focuses on the improvement of heating efficiency, that is, structural improvement, or joint utilization with other energy sources, such as solar energy. For example, in the patent "A Solid Heat Storage Electric Heater" (application number CN201310572126.1), the best heat dissipation effect is achieved through the dual heating functions of the heat dissipation fin radiator and the solid heat storage inner tank, and the low power heat storage , high-power heating, dual functions to meet indoor heat demand. At the same time of heat supply, heat energy can also be stored, but only ordinary heat preservation materials are used, and the heat preservation and heat dissipation time lasts for 8 to 16 hours after power failure. In the patent "A Composite Device for Hot Water Supply and Radiant Heating with Solar Energy, Peak-valley Electric Heat Storage" (Application No. CN200310108327.2), through solar collectors, metal solid peak-valley electric heat storage electric hot water tanks, The heat exchange type hot water storage tank is connected in series to obtain hot water, and at the same time, the radiant heating device and the heating circulation pump are connected in parallel to the circuit between the metal solid peak-valley electric heat storage electric water tank and the heat exchange type hot water storage tank, thereby Radiant heating. In the patent "solar high-temperature solid heat storage system" (application number CN201120318064.8), the combination of solar collectors and valley energy solid heat storage devices is used to generate hot air, which is suitable for residences, shopping malls, office buildings, office buildings, factories, etc. heating. There are also some patents dedicated to the development of heat storage materials. For example, in the patent "Manufacturing Method of Heat Storage Bricks Mainly Utilizing Low-valley Electric Energy Storage" (application number CN200410015038.2), magnetite is used as the main raw material, and after crushing , Semi-dry machine press forming, and heat storage bricks are formed by high temperature sintering. It can be widely used in various thermal fields such as heat storage room heaters and heating boilers. In the patent "High Performance Phase Change Heat Storage Material and Its Application Technology" (Application No. CN03148548.0), it also mainly involves the formulation and production process of a phase change material with high heat storage capacity. To sum up, there are still few researches on thermal insulation technology specifically for solid heat storage. At present, Valley Energy solid heat storage energy storage devices mainly have the problems of large heat loss during the day and large internal temperature fluctuations, which are difficult for users to maintain for a long time. Continuous heating.

Contents of the invention

Purpose of the invention: In order to solve the problem of large daytime heat loss and large internal temperature fluctuations in the existing technology of valley energy solid heat storage energy storage devices, it is difficult for users to continue heating for a long time, the present invention provides a solar-assisted valley energy solid phase Variable heat storage device.

Technical solution: In order to achieve the above technical purpose, the present invention discloses a solar energy-assisted valley energy solid phase change heat storage device, including a solar photovoltaic device, a power storage device, a phase change heat preservation structure, a temperature control device and a heat storage solid. The heat storage solid is arranged in the phase change heat preservation structure, the electricity storage device is electrically connected to the phase change heat preservation structure, and the signal input end of the temperature control device is connected to the phase change heat preservation structure of each layer of the phase change heat preservation structure. Layer connection, the signal output end of the temperature control device is connected to the signal input end of the power storage device, the solar photovoltaic device and the phase change heat preservation structure are connected through the power storage device; wherein, the phase change The thermal insulation structure is a sealed thermal insulation structure, including thermal insulation layers and phase change thermal insulation layers alternately stacked from the inside to the outside, wherein the outermost layer is a thermal insulation layer, and the heat storage solid is arranged on the innermost thermal insulation layer Inside, the phase change temperature of the phase change material of the phase change thermal insulation layer decreases gradually from the inner layer to the outer layer.

Preferably, the number of layers of the phase-change thermal insulation layer is 2-4 layers.

Specifically, the phase-change insulation layer of each layer includes a phase-change material, two conductive sheets and a number of electric resistance wires, and the two ends of each electric resistance wire are respectively fixed between the two conductive sheets, and the phase-change material It is filled in the phase-change thermal insulation layer; the two conductive sheets are connected with the power storage device through wires; the thermal insulation layer of each layer is only filled with thermal insulation material.

Wherein, the conductive sheet is any one of copper strip, aluminum strip or iron sheet.

Further, the conductive sheet of each phase-change thermal insulation layer is connected to the electric storage device through a selective connection switch, and the connection of each selective connection switch does not interfere with each other, and is connected to the electric storage device through the main connection switch.

Preferably, the phase change material inside each layer of phase change insulation layer is one of single inorganic salt or multiple mixed molten salt; the insulation material inside each layer of heat insulation layer is rigid polyurethane foam, polystyrene foam Either plastic or polyethylene foam.

In order to further improve the effect of the system, the melting point of the phase change material of the innermost phase change insulation layer is equal to or slightly higher than the temperature of the heat storage solid, preferably equal to or higher than the temperature of the heat storage solid by 5-20°C, from the inside to the The melting points of the phase change materials in the outer adjacent phase change insulation layers differ by 90-100°C and decrease successively until the difference between the melting point of the outermost phase change insulation layer and the ambient temperature is within 100°C.

In a preferred embodiment, the number of layers of the phase-change thermal insulation layer is three layers, which are the inner phase-change thermal insulation layer, the middle phase-change thermal insulation layer, and the outer phase-change thermal insulation layer from the inside to the outside; The number of layers is four, and from the inside to the outside are the first heat insulation layer, the second heat insulation layer, the third heat insulation layer and the fourth heat insulation layer, wherein the first heat insulation layer, the second heat insulation layer and the The thickness of the third thermal insulation layer is 30mm-50mm, and the thickness of the fourth thermal insulation layer is 150mm-200mm.

Among them, assuming that the insulation materials filled in each layer of insulation layer are the same, the thickness of each layer of insulation layer and the quality of phase change material filled in each layer of phase change insulation layer satisfy the following formula:

Among them, m ₁ , m ₂ and m ₃ are the mass of the phase change material filled in the inner phase change insulation layer, the middle phase change insulation layer and the outer phase change insulation layer respectively; O is the latent heat per unit mass of the phase change material; T is the latent heat release time; A is the outer surface area of the inner phase change insulation layer, the middle phase change insulation layer or the outer phase change insulation layer; Δt is the temperature difference between the melting point of the phase change material and the ambient temperature; _h1 is the inner phase change insulation layer The heat transfer coefficient of the outer surface of the layer; h ₂ is the heat transfer coefficient of the outer surface of the middle phase change insulation layer; h ₃ is the heat transfer coefficient of the outer surface of the outer phase change insulation layer; λ is the first heat insulation layer, the second heat insulation layer and The thermal conductivity of the thermal insulation material of the third thermal insulation layer; λ ₁ is the thermal conductivity of the middle phase change thermal insulation layer; λ ₂ is the thermal conductivity of the middle layer phase change thermal insulation layer; λ ₃ is the thermal conductivity of the outer layer phase change thermal insulation layer; δ ₀ is the thickness of the second thermal insulation layer; δ′ ₀ is the thickness of the third thermal insulation layer; δ is the thickness of the fourth thermal insulation layer; δ ₂ is the thickness of the middle phase change thermal insulation layer _; The thickness of the insulation layer.

Preferably, each layer of phase-change thermal insulation layer is surrounded by corrosion-resistant alloy materials.

Beneficial effects: The solar energy assisted valley energy solid phase change thermal storage device of the present invention arranges the thermal insulation layer and the phase change thermal insulation layer successively, wherein the phase change thermal insulation structure is a sealed structure filled with suitable phase change materials, electric resistance wires Arranged inside, the phase change insulation layer can be supplemented with heat so that the phase change material is always at the phase change temperature. At the same time, the heat insulation layer can reduce the temperature fluctuation caused by the temperature drop of the phase change material and delay the heat loss of the phase change material , so that the phase change heat preservation structure and the heat storage solid are approximately adiabatic, so that the temperature fluctuation between the two is small, so as to realize the long-term heat preservation of the heat storage solid. At the same time, according to the thermal environment required by the user, you can choose to connect the phase-change insulation layers with different phase-change temperatures to obtain different heating temperatures, or you can choose to connect the phase-change insulation layers with different phase-change temperatures at the same time to obtain longer Time heating temperature.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a schematic diagram of the structure of the phase change insulation layer.

detailed description

The present invention proposes a solar energy-assisted valley energy solid phase change heat storage device, including a solar photovoltaic device, a power storage device, a phase change heat preservation structure, a temperature control device and a heat storage solid, and the heat storage solid is arranged on the phase change In the heat preservation structure, the power storage device is electrically connected to the phase change heat preservation structure, the signal output end of the temperature control device is connected to the signal input end of the power storage device, and the solar photovoltaic device is connected to the phase change heat preservation structure. The heat preservation structure is connected through the power storage device; wherein, the phase change heat preservation structure is a sealed heat preservation structure, including heat insulation layers and phase change heat preservation layers alternately stacked from the inside to the outside, wherein the outermost layer is a heat insulation layer layer, the heat storage solid is arranged in the innermost heat insulation layer, and the phase change temperature of the phase change material of the phase change heat preservation layer decreases gradually from the inner layer to the outer layer.

Wherein, the phase change insulation layer of each layer includes a phase change material, two conductive sheets and a number of electric resistance wires, and the two ends of each electric resistance wire are respectively fixed between the two conductive sheets, and the phase change material fills In the phase change insulation layer; the two conductive sheets are connected with the storage device through wires. The material of the conductive sheet can be any one of copper strip, aluminum strip or iron sheet. The conductive sheet of each phase-change heat preservation layer is connected to the electric storage device through a selective connection switch, and the connection of each selective connection switch does not interfere with each other, and is connected to the electric storage device through a main connection switch. The phase change material inside each phase change insulation layer and the insulation material inside the heat insulation layer can be selected according to actual needs. Usually, the melting point of the phase change material in the innermost phase change insulation layer is equal to or slightly higher than the temperature of the heat storage solid, and the melting point of the phase change material in adjacent phase change insulation layers from the inside to the outside differs by 90-100°C and decreases successively As for the difference between the melting point of the outermost phase change insulation layer and the ambient temperature within 100°C.

Invention principle: The solar energy assisted valley energy solid phase change thermal storage device of the present invention arranges the thermal insulation layer and the phase change thermal insulation layer successively, wherein the phase change thermal insulation structure is a sealed structure, filled with suitable phase change materials, electric resistance wires Arranged inside, the phase change insulation layer can be supplemented with heat so that the phase change material is always at the phase change temperature. At the same time, the heat insulation layer can reduce the temperature fluctuation caused by the temperature drop of the phase change material and delay the heat loss of the phase change material , so that the phase change heat preservation structure and the heat storage solid are approximately adiabatic, so that the temperature fluctuation between the two is small, so as to realize the long-term heat preservation of the heat storage solid. At the same time, according to the thermal environment required by the user, you can choose to connect the phase-change insulation layers with different phase-change temperatures to obtain different heating temperatures, or you can choose to connect the phase-change insulation layers with different phase-change temperatures at the same time to obtain longer Time heating temperature.

The present invention will be described in detail below through specific examples.

As shown in Figure 1, the heat storage solid 9 of the present invention is a magnesium oxide heat storage brick, which is stacked in a cube shape. The heat storage target temperature of the heat storage brick is 300°C, and the ambient temperature is 5°C. The first heat insulation layer 10, the inner phase change heat preservation layer 11, the second heat insulation layer 12, and the middle phase A thermal insulation layer 13, a third thermal insulation layer 14, an outer phase change thermal insulation layer 15, and a fourth thermal insulation layer 16. Among them, one of NaNO ₃ (melting point 310°C) and KNO ₃ /4.5KCl (melting point 320°C) can be selected for the inner layer phase change insulation layer (melting point 310°C), and Solar Salt (melting point 310°C) can be selected for the middle layer phase change insulation layer ( Melting point 220°C), NaNO ₂ /73NaOH* (melting point 237°C), the outer phase change insulation layer can choose HitecXL (melting point 120°C), the filling quality of the phase change material in the phase change insulation layer of each layer depends on the The selected specific phase change material properties are calculated according to the following formula:

Among them, m ₁ , m ₂ and m ₃ are the mass of the phase change material filled in the inner phase change insulation layer, the middle phase change insulation layer and the outer phase change insulation layer respectively; Q is the latent heat per unit mass of the phase change material; T is the latent heat release time; A is the outer surface area of the inner phase change insulation layer, the middle phase change insulation layer or the outer phase change insulation layer; Δt is the temperature difference between the melting point of the phase change material and the ambient temperature; _h1 is the inner phase change insulation layer The heat transfer coefficient of the outer surface of the layer; h ₂ is the heat transfer coefficient of the outer surface of the middle phase change insulation layer; h ₃ is the heat transfer coefficient of the outer surface of the outer phase change insulation layer; λ is the first heat insulation layer, the second heat insulation layer and The thermal conductivity of the thermal insulation material of the third thermal insulation layer; λ ₁ is the thermal conductivity of the middle phase change thermal insulation layer; λ ₂ is the thermal conductivity of the middle layer phase change thermal insulation layer; λ ₃ is the thermal conductivity of the outer layer phase change thermal insulation layer; δ ₀ is the thickness of the second thermal insulation layer; δ′ ₀ is the thickness of the third thermal insulation layer; δ is the thickness of the fourth thermal insulation layer; δ ₂ is the thickness of the middle phase change thermal insulation layer _; The thickness of the insulation layer.

The four thermal insulation layers are only filled with rigid polyurethane foam, wherein the thickness of the first thermal insulation layer 10, the second thermal insulation layer 12, the third thermal insulation layer 14 and the fourth thermal insulation layer 16 are 30mm, 40mm, 50mm, 200mm. As shown in FIG. 2 , each phase change insulation layer is provided with a conductive sheet 18 and an electric resistance wire 19 , and is connected to the electrical storage device 2 by an electric wire 17 . The inner phase-change thermal insulation layer 11, the middle phase-change thermal insulation layer 13, and the outer phase-change thermal insulation layer 15 are all enclosed by corrosion-resistant alloy materials—nickel-based superalloys. During the time when there is no sunlight at night, the heat storage brick 9 is heated to a target temperature of 300° C. by using the valley electricity at night. When there is sunshine during the day, the solar photovoltaic device 1 generates electric energy, which is transmitted to the electric resistance wire 19 through the electric storage device 2, and then generates heat energy, so that the phase change material of the inner layer phase change insulation layer 11 is heated to a state of releasing latent heat, so that the internal storage The temperature of the thermal brick 9 is kept above 300°C, wherein the first thermal insulation layer 10, the second thermal insulation layer 12, the third thermal insulation layer 14 and the fourth thermal insulation layer 16 can all reduce The temperature fluctuation caused by heat dissipation, while the inner phase change insulation layer 11 naturally dissipates heat to the outside, the middle phase change insulation layer 13 and the outer phase change insulation layer 15 are gradually heated, and may reach the state of releasing latent heat, which can be further reduced The loss of internal heat. When the inner phase change insulation layer 11, the middle phase change insulation layer 13, and the outer phase change insulation layer 15 have finished releasing their latent heat and are lower than the phase transition temperature, the temperature control device 4 starts to connect the power storage device 2 to start supplementing heat. , each layer of phase change insulation layer is maintained at the phase change temperature.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements can also be made, and these improvements should also be regarded as the present invention. protection scope of the invention.

Claims (10)

1. A solar energy-assisted valley energy solid phase change heat storage device, characterized in that it comprises a solar photovoltaic device, an electrical storage device, a phase change heat preservation structure, a temperature control device and a heat storage solid, and the heat storage solid is arranged on the In the phase change heat preservation structure, the power storage device is electrically connected to the phase change heat preservation structure, the signal input end of the temperature control device is connected to each phase change heat preservation layer of the phase change heat preservation structure, and the temperature control The signal output end of the device is connected to the signal input end of the power storage device, and the solar photovoltaic device is connected to the phase change heat preservation structure through the power storage device; wherein, the phase change heat preservation structure is a sealed heat preservation structure, It includes thermal insulation layers and phase change thermal insulation layers alternately stacked from the inside to the outside, wherein the outermost layer is a thermal insulation layer, the heat storage solid is arranged in the innermost thermal insulation layer, and the phase change thermal insulation layer The phase transition temperature of the phase change material of the layer decreases gradually from the inner layer to the outer layer. 2. The solar-assisted valley-energy solid phase-change thermal storage device according to claim 1, characterized in that the number of phase-change thermal insulation layers is 2-4. 3. The solar-assisted valley energy solid phase-change heat storage device according to claim 1, wherein the phase-change insulation layer of each layer includes a phase-change material, two conductive sheets and some electric resistance wires, each The two ends of the electric resistance wire are respectively fixed between two conductive sheets, and the phase change material is filled in the phase change insulation layer; the two conductive sheets are connected to the power storage device through wires; the heat insulation layer of each layer is filled with Insulation Materials. 4. The solar-assisted valley-energy solid phase-change heat storage device according to claim 3, wherein the conductive sheet is any one of copper strips, aluminum strips or iron sheets. 5. The solar energy auxiliary valley energy solid phase change heat storage device according to claim 3, wherein the conductive sheet of each layer of phase change insulation layer is connected with the power storage device through a selectable connection switch, and the connection of each selectable connection switch They do not interfere with each other, and they are all connected to the power storage device through the main switch. 6. The solar-assisted valley energy solid phase-change thermal storage device according to claim 1, wherein the phase-change material inside each layer of phase-change insulation layer is one of a single inorganic salt or a multi-component mixed molten salt; The thermal insulation material inside the thermal insulation layer is any one of rigid polyurethane foam, polystyrene foam and polyethylene plastic foam. 7. The solar-assisted valley energy solid phase-change heat storage device according to claim 1, wherein the melting point of the phase-change material of the innermost phase-change insulation layer is equal to the temperature of the heat-storage solid, adjacent from inside to outside The melting point of the phase change material in the phase change heat preservation layer differs by 90-100°C and decreases successively until the difference between the melting point of the outermost phase change heat preservation layer and the ambient temperature is within 100°C. 8. The solar-assisted valley energy solid phase-change heat storage device according to claim 1 or 2, wherein the number of layers of the phase-change thermal insulation layer is three layers, and the phase-change thermal insulation layer of the inner layer is respectively from the inside to the outside. The middle phase change insulation layer and the outer phase change insulation layer; the number of layers of the heat insulation layer is four layers, which are respectively the first heat insulation layer, the second heat insulation layer, the third heat insulation layer and the fourth heat insulation layer from the inside to the outside. The thermal insulation layer, wherein, the thickness of the first thermal insulation layer, the second thermal insulation layer and the third thermal insulation layer is 30mm-50mm, and the thickness of the fourth thermal insulation layer is 150mm-200mm. 9. The solar-assisted valley energy solid phase-change thermal storage device according to claim 8, wherein the thickness of each layer of thermal insulation layer and the quality of the phase-change material filled inside each layer of phase-change thermal insulation layer satisfy the following formula: ${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; t</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ,</span>$ ${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; t</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ,</span>$ ${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; t</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ,</span>$ Among them, m ₁ , m ₂ and m ₃ are the mass of the phase change material filled in the inner phase change insulation layer, the middle phase change insulation layer and the outer phase change insulation layer respectively; Q is the latent heat per unit mass of the phase change material; T is the latent heat release time; A is the outer surface area of the inner phase change insulation layer, the middle phase change insulation layer or the outer phase change insulation layer; Δt is the temperature difference between the melting point of the phase change material and the ambient temperature; _h1 is the inner phase change insulation layer The heat transfer coefficient of the outer surface of the layer; h ₂ is the heat transfer coefficient of the outer surface of the middle phase change insulation layer; h ₃ is the heat transfer coefficient of the outer surface of the outer phase change insulation layer; λ is the first heat insulation layer, the second heat insulation layer and The thermal conductivity of the thermal insulation material of the third thermal insulation layer; λ ₁ is the thermal conductivity of the middle phase change thermal insulation layer; λ ₂ is the thermal conductivity of the middle layer phase change thermal insulation layer; λ ₃ is the thermal conductivity of the outer layer phase change thermal insulation layer; δ ₀ is the thickness of the second thermal insulation layer; δ′ ₀ is the thickness of the third thermal insulation layer; δ is the thickness of the fourth thermal insulation layer; δ ₂ is the thickness of the middle phase change thermal insulation layer _; The thickness of the insulation layer. 10. The solar-assisted valley-energy solid phase-change heat storage device according to any one of claims 1-9, characterized in that each phase-change insulation layer is enclosed by corrosion-resistant alloy materials.