211results about How to "Improve heat storage efficiency" patented technology

The invention discloses a novel phase-change material composition. The novel phase-change material composition mainly comprises carbon nanotubes, graphene, fumed silica, metal or metal oxide particles and a phase-change material. The carbon nanotubes, graphene and metal or metal oxide particles can further accelerate heat transmission. The phase-change material is used for improving a hot end initial temperature absorption rate. The fumed silica has effects of precipitation prevention and thickening and can prevent graphene and particle aggregation settlement after heat absorption liquefaction of the phase-change material. The carbon nanotubes, graphene and metal or metal oxides can finally form a full 3D network comprising particles (metal or metal oxides), wires (carbon nanotubes) and planes (graphene) in the fluid (of phase-change material subjected to heat absorption melting). The novel phase-change material composition has high heat conductivity and low thermal resistance value, has high specific heat capacity, greatly improves phase-change material heat absorption, heat storage and heat radiation efficiency and has a high practical value.

The invention relates to a method for arranging the structure of heat exchange pipes of a concrete heat storage system for solar thermal power generation, comprising the following steps: arranging a plurality of heat exchange pipes which are arranged equidistantly in a concrete heat storage block (5), connecting two ends of each heat exchange pipe with an inlet pipe (1) and an outlet pipe (7) through a connecting pipe, arranging an inlet control valve (2) and an air inlet and evacuation pipe (3) on each inlet pipe (1), arranging an air inlet and evacuation valve (4) on the air inlet and evacuation pipe (3), and arranging an outlet control valve (6) on each outlet pipe (7). The solar thermal power generation technology is made to be practical due to the adoption of the method. When the structure of the heat exchange pipes, which is arranged by the method, is used, the heat conducting medium is made to flow in the heat exchange pipes from the inlet pipes, then the switch and the flow rate are adjusted through the inlet control valves, the heat is exchanged by the heat exchange pipes and is stored in the concrete heat storage block, and the heat conducting medium is made to flow out of the heat exchange pipes from the outlet pipes. The invention reduces the power generation cost, improves the heat exchange and storage efficiency and ensures that the working temperature of the concrete heat storage system is 600-900 DEG C which is much higher than the use temperature of the prior molten salt.

The invention relates to a honeycomb heat accumulator made of silicon carbide-corundum composite materials, which comprises the following main raw materials: 20-30wt% of silicon carbide powder, 4-8wt% of zirconia corundum powder, 20-30wt% of corundum powder, 15-20wt% of porzite powder, 15-30wt% of composition of kyanite, andalusite and sillimanite, 4-8wt% of kaolin and 2-5wt% of cellulose powder. The preparation method of the honeycomb heat accumulator comprises the following steps: adding the main raw materials into a ball mill for ball milling; adding stearic acid of which the weight is not greater than 1% of the total weight of the main raw materials for ball milling, and then, sieving to obtain a mixture; respectively adding tung oil of which the weight is not greater than 1% of the weight of the mixture and glycerol of which the weight is not greater than 1% of the weight of the mixture for mixing, aging and vacuum pugmill to form pug segments; carrying out extrusion forming in a mold, and drying; and insulating at the temperature of 1400-1450 DEG C for 4-8 hours, and then, calcining. The honeycomb heat accumulator of the invention has the characteristics of high fire resistance, good thermal shock resistance, strong corrosion resistance, large heat exchange area, small gas flow resistance, high heat accumulating efficiency, small floor space and long service life which can be more than two years, and is widely used for heat accumulating type heating furnaces of black and non-ferrous smelting, thermal power generation, petrochemical industry, ceramics, glass, machining, civil cookers and the like.

The invention discloses an active-passive cooperative heat storage wall heating system of a solar greenhouse, and belongs to the technical field of agricultural facilities. The active-passive cooperative heat storage wall heating system mainly comprises a phase-change heat storage wall, a concentration-type solar air heat collector system, an active heat storage heating system body and an equipment control unit. The phase-change heat storage wall is composed of a cement mortar layer, a phase-change heat storage layer, a bearing building block layer and a thermal insulation layer from the indoor side to the outdoor side, wherein the phase-change heat storage layer is formed by pouring phase-change materials packaged through steel drums, heat storage coil pipes, gravel and cement. The solar air heat collector system is formed by connecting multiple groups of condensation-type solar air heat collectors in series, and a sunshade device used in summer is arranged above the heat collectors. The active heat storage heating system body is composed of a heat collector, thermal insulation pipes, a heat storage coil pipe, a frequency conversion fan, air openings and air valves. The equipment control unit is composed of a controller, a temperature sensor and electric adjusting air valves. According to the active-passive cooperative heat storage wall heating system, active and passive heat collection, heat storage and heat supply of the wall of the solar greenhouse are combined, therefore, the heat storage and thermal insulation performance of the wall of the solar greenhouse can be obviously enhanced, the solar energy utilization rate of the greenhouse can be obviously increased, and the adjusting capacity of the heat storage wall of the solar greenhouse to the heat environment in the greenhouse is improved.

The invention relates to a novel liquid air energy storage system using phase change energy storage. The novel liquid air energy storage system has two working states including energy storage and energy releasing; in the energy storage process, a compressor unit is driven by a driving unit, and is sequentially connected with a heat accumulator set, a regenerator, a liquid expansion machine, a gas-liquid separator and a liquid air storage tank; and in the energy releasing process, a cryogenic pump is sequentially connected with the regenerator, a vaporizer, the heat accumulator set and a main expansion machine set, the main expansion machine set drives a power generator, the cryogenic pump is connected with the liquid air storage tank, winding pipe type heat exchangers are adopted in the heat accumulator set and the regenerator, a phase change heat storage material is contained in a shell pass, and an intermediate medium vaporizer is adopted as the vaporizer. According to the novel liquid air energy storage system, the winding pipe type heat exchangers and the intermediate medium vaporizer are applied to the liquid air energy storage system, air is led into a pipe pass to exchange heat with the phase change heat storage material and a phase change cold storage material in the shell side, compressed heat and liquid air cold are stored by the phase change heat storage material and the phase change cold storage material correspondingly, circulated utilization of the heat and the cold is guaranteed, and the efficiency of the system is improved.

The invention discloses a spraying type packed bed heat storage system and an operating method thereof, which are used in the field of medium-high temperature heat energy storage. The spraying type packed bed heat storage system mainly comprises a spraying type packed bed heat storage apparatus, a liquid storage tank, a heat exchanger, a heat source supplying end, a heat source user end, a condenser, a liquid collection tank and the like. The system stores heat energy provided by the heat source supplying end in a solid heat storage medium in the packed bed through a liquid heat transfer medium during a heat storage stage, and releases the heat energy from the solid materials to generate electricity or supply heat during a heat utilization stage. The spraying type packed bed heat storage system and operating method have the advantages of being high in heat storage efficiency, high in heat energy grade, wide in applicable temperature field, low in cost, safe to operate and the like, areparticularly suitable for the fields of medium-high temperature solar thermal power generation and industrial high-temperature waste heat utilization, and can also complement the cascade energy utilization with large-scale physical energy storage system, such as a compressed air energy storage system, to improve energy utilization efficiency.

The invention discloses a phase change heat storage device. The phase change heat storage device comprises a heat accumulator shell, heat exchange pipelines and phase change materials, wherein the heat exchange pipelines and the phase change materials are arranged in the heat accumulator shell. The phase change heat storage device is characterized in that a porous metal framework is arranged in the heat accumulator shell, porous channel arrays are arranged on the porous metal framework in parallel in the axial direction, and the phase change materials are located in all porous channels of the porous channel arrays; the heat exchange pipelines are arranged in the porous channel arrays in the axial direction of the porous metal framework at intervals; each heat exchange pipeline is surrounded by at least one circle of pore channels; a flow dividing device is arranged at inlets of the heat exchange pipelines, and a flow collecting device is arranged at outlets of the heat exchange pipelines; three-dimensional crossed flow guide type chaos turbulators are further arranged in the heat exchange pipelines. According to the phase change heat storage device, due to the fact that the three-dimensional crossed flow guide type chaos turbulators are arranged in the heat exchange pipelines, flow guide blocks which are arrayed periodically and alternately can induce fluid to generate chaos convection, heat exchange between the fluid and pipe walls can be enhanced obviously, and the heat storage device can achieve excellent heat storage and heat exchange capability.

The invention discloses a optical-hopper light conductive energy-accumulated high-temperature phase-variable forced recycle solar-energy furnace, which comprises a optical hopper, a energy accumulator, a recycle pump, a oil tank, and a user heat supplier. Wherein, the heat accumulator and the heat exchanger at inside the frame of energy accumulator; the tubes of heat exchanger is through the heat collecting chamber to connect the recycle pump and the oil tank; the oil tank via the heat conducive oil recycle tube is connected to the user heat supplier; the light is collected by the optical hopper, and via the transparent inlet window to enter into the heat collecting chamber to be transformed into heat energy and via the heat conductive plate to be transmitted to the heat accumulator to be stored; when user uses energy, switching on the recycle pump to pump the heat conductive oil of oil tank into the heat exchanger of energy accumulator to exchange heat with the heat accumulator to attain high-temperature heat conductive oil to be transmitted via the recycle tube to the user heat supplier. The invention can utilize the optical hopper to collector light, use the high-temperature phase variable material to store energy, and supply high-temperature heat to the user.

The invention discloses a waste heat recovery device and a control method of a refrigeration system for realizing multi-temperature zone water supply. The device includes a heat recovery circuit connected in parallel on the condensation side of the refrigeration system, and also includes a heat pump system, a water supply system, a first water outlet (100) and a second water outlet (200); cooling, while the heat recovery loop utilizes the heat of the refrigeration system to heat the water and output it from the first water outlet (100); the heat recovery loop is also connected to the heat pump system to realize the heating of the heat pump system to the output water of the heat recovery loop; and, the heat The water heated by the recovery loop also heats and subcools the heat pump system. The present invention utilizes the characteristics that the food processing industry needs water supply in multiple temperature zones, combines the refrigeration system, the replenishment water supply system and the heating system, and through one-time water supply, not only realizes low, medium and high temperature water supply, but also improves the refrigeration system and Efficiency of the heat pump system.

The invention discloses a double-regenerative combustor, which comprises a blast furnace gas burner and a combustion-supporting air burner which are embedded on the furnace wall in pair. The blast furnace gas burner and the combustion-supporting air burner comprises a blast furnace gas burner block and a combustion-supporting air burner block respectively, one end, leading to a furnace, of the blast furnace gas burner block is provided with gas burner nozzles, one end, leading to the furnace, of the combustion-supporting air burner block is provided with air burner nozzles, and the spaying directions of the nozzles inwardly incline to one another and form an included angle of 2-15 degrees relative to the horizontal plane. A gas burner block hollow cavity is arranged at one end, facing the outer side of the furnace wall, of the blast furnace gas burner block, an air burner block hollow cavity is arranged at one end, facing the outer side of the furnace wall, of combustion-supporting air burner block, and a thick-walled honeycomb ceramic heat accumulator, a conventional honeycomb ceramic heat accumulator, a metal barrier and a pipe connecting box are arranged on each of the gas burner block hollow cavity and the air burner block hollow cavity from inside to outside. By the means, the purposes of effectively delaying damage process of the double-regenerative combustor, greatly prolonging the service lives of the burner blocks, and improving usability of the double-regenerative combustor and thermal property of the heating furnace are finally achieved.

The invention relates to a light conductive energy-gathering high-temperature phase variable accumulation solar-energy generator, which comprises: a light conductive channel, a transparent window, a outer frame, a heat collecting chamber, a heat accumulator, a heat conductive bar, a heat conductive plate, and thermal-insulated material. Wherein, the heat accumulator is inside the frame and above the heat collecting chamber; the heat conductive bar through the heat accumulator is connected to the lower part of heat conductive plate; the frame is formed by two frames whose interlayer space are vacuumed. The sunlight via the light conductive tube or optical fiber and transparent window enters the heat collecting chamber to be transformed into heat energy, which via the conductive bar is stored into heat accumulator. The invention can use high-temperature phase variable accumulation material to store the heat. When user needs heat, the energy is provided via the conductive plate.

The invention discloses a metal hydride reactor gradiently filled with expanded graphite. The metal hydride reactor comprises a shell, a reaction bed, a hydrogen inlet and outlet pipe and a heat exchange pipe, wherein the reaction bed is of a multi-layer structure; the interior of each layer of the reaction bed is filled with expanded graphite; and the mass contents of the expanded graphite filling in all layers of the reaction bed are gradiently increased. The metal hydride reactor provided by the invention can reduce the usage amount of a highly-conductive material, namely, the expanded graphite, enables the heat storage density per unit volume of the layers of the reaction bed to be increased, and can improve the rate of a hydrogen absorption reaction compared with a metal hydride reactor with equal addition amount of the expanded graphite.

The invention discloses an adjustable chemical heat storage system and belongs to the technical field of heat storage. The adjustable chemical heat storage system comprises a steam generator, a steam mass flowmeter, a reaction kettle, a heat exchanger, a vacuum pump and heat storage materials, wherein the steam generator, the reaction kettle and the vacuum pump are connected in sequence; the steam mass flowmeter is arranged between the steam generator and the reaction kettle; the heat storage materials are arranged in the reaction kettle; the heat exchanger makes contact with the heat storage materials; the heat storage materials are obtained by mixing Ca(OH)2 and compounds containing Li. According to the adjustable chemical heat storage system, the heat storage density is large, the stability is good, the cost is low, the chemical energy storage requirement can be well met, and the adjustable chemical heat storage system can be applied to solar heat storage and recycling and industrial waste heat recycling.

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.

The invention discloses a thermochemical energy storage system. The thermochemical energy storage system comprises a light focusing and tracking system, an endothermic reaction system, a first sealedstorage tank system, a second sealed storage tank system, a third sealed storage tank system, a heat releasing reaction system and a heat utilization system, wherein the light focusing and tracking system focuses and projects sunlight to the endothermic reaction system, the endothermic reaction system performs endothermic chemical reactions, gas and solid products generated by the chemical reactions of the endothermic reaction system are stored inside the third sealed storage tank system and the second sealed storage tank system correspondingly to be taken as reactants of the heat releasing reaction system, and the heat releasing reaction system performs heat releasing chemical reactions and delivers released heat to the heat utilization system and stores the products generated by the chemical reactions inside the first sealed storage tank system to be taken as the reactants of the endothermic reaction system at the same time. By means of the thermochemical energy storage system, solarphoton energy is directly supplied to heat storage material particles, the internal temperature of the heat storage material particles is distributed evenly, the heat storage material sintering resistance is improved, and the system circulation stability is improved.

The invention discloses a heat storage device and system. The heat storage device comprises a heat storage tank for storing heat, a heat inlet and a heat outlet are correspondingly disposed on two sides of the heat storage tank, a plurality of layers of phase change materials are disposed in the heat storage tank, and a flow passage for a heat transfer medium is formed between the heat inlet and the heat outlet through gaps of the multiple layers of the phase change materials; a phase transition temperature of each layer of the phase change materials increases one by one in the direction fromthe heat inlet to the heat outlet, and the phase transition temperature is a melting temperature of which the current temperature of the heat transfer medium reaches a melting point of each layer of the phase change materials. According to the heat storage device and system, the multiple layers of the phase change materials are arranged with different phase transition temperatures, thereby providing enough capacity of stored heat, and accelerating the heat storage efficiency through the latent heat of phase change.

The invention discloses a solar thermal storage system comprising at least one thermal storage pile. The thermal storage pile is communicated with a main pipeline through an inlet and an outlet, and comprises an adiabatic thermal storage chamber and at least two thermal storage units arranged inside the thermal storage chamber. One thermal storage unit is communicated with the inlet, and the other thermal storage unit is communicated with the outlet. Hot working medium channels are arranged inside the thermal storage units. Hot working medium flows into the hot working medium channels of the thermal storage units from the main pipeline through the inlet, flows through the entire storage pile and then flows back to the main pipeline through the outlet; main thermal transmitting channels of the hot working medium are formed. Auxiliary thermal transmitting channels used for balancing thermal among the thermal storage units are further arranged inside the thermal storage chamber, the thermal storage units with higher temperature transmit the thermal of the hot working medium to the thermal storage units with lower temperature through the auxiliary thermal transmitting channels. The problems that according to an existing solar thermal storage system, since temperatures of thermal storage modules are imbalanced, thermal storage efficiency of the thermal storage system is low are solved.

The invention relates to self-compacting concrete for a solar heat storage material and belongs to high-additional-value resource utilization. The self-compacting concrete is prepared from cement, an active material, porous ceramisite loaded metal powder, an additive, water-washed medium sand, pebbles, heat conductive fibers and water. The concrete is high in heat capacity, the heat storage efficiency of the heat storage material can be ensured, the problems that an original concrete heat storage material is low in compactness and likely to crack at high temperature are solved, and the application range of the self-compacting concrete can be enlarged. The process is simple, and economic and environment-friendly benefits are high.

The invention relates to a cellulose / polypyrrole supported composite phase change heat storage material and a preparation method thereof, which is obtained by growing polypyrrole in situ on the cellulose porous material and fixing the phase change heat storage material on the polypyrrole modified cellulose porous material through capillary adsorption. The cellulose / polypyrrole supported compositephase change heat storage material utilizes the high conductivity of polypyrrole to quickly convert electric energy into heat energy, rises to a higher temperature in a short time, has high heat storage efficiency, improves thermal comfort and energy utilization rate of heating, reduces energy consumption loss, and has good market application prospects.

The invention discloses a phase change heat storage device and heat exchange device. The phase change heat storage device and heat exchange device comprises a shell, a heat preservation layer, a liner, a heat exchange pipe device, phase change materials, foam metal, a sealing ring, a top cover and flanges; the space between the shell and the liner is filled with the heat preservation layer; the heat exchange pipe device comprises a long heat exchange pipe, a short heat exchange pipe, a leveling plate, a water inlet pipe and a water outlet pipe; the liner comprises a front plate, a rear plate,a side plate, a vertical beam, a cross beam, a bottom beam, a liner flange and an inclined support; the heat exchange pipe device is placed on the inclined support of the liner through the leveling plate in a hung mode; an inner cavity of the liner is fully filled with the phase change materials, and the foam metal is placed on the specific position; the top cover comprises a top cover shell plate, a top cover flange plate, a lifting lug and an exhaust pipe; an inner cavity of the top cover is filled with the heat preservation layer, and the inner cavity of the liner communicates with the atmospheric environment through the exhaust pipe; and the water inlet pipe and the water outlet pipe are connected with an external pipeline through flanges. According to the phase change heat storage device and heat exchange device, the phase change energy-storage and heat exchanger equipment is compact in structure, high in heat storage efficiency, high in heat exchange efficiency and uniform in temperature distribution at present.

The invention provides a floor based on a phase change material. The floor comprises a floor layer, a phase change material layer, a balanced heating layer, a heat insulation material layer and a temperature control device, wherein the floor layer is arranged on the surface layer; the heat insulation material layer is arranged on the bottom layer; the balanced heating layer is arranged above the heat insulation material layer; the phase change material layer is arranged between the floor layer and the balanced heating layer; and the balanced heating layer is electrically connected with the temperature control device. The floor provided by the embodiment of the invention can intelligently control the indoor floor temperature, and is long in heat preservation time and high in energy utilization rate.

The invention belongs to the solar heat storage technical field, in particular to a solar heat reservoir, which solves the problem that a solar energy storage method with high efficiency, long service lite and low cost does not exist in the prior art. The solar heat reservoir comprises a heat collecting device and a heat storage device. The heat storage device is connected with a heat consuming device. The heat collecting device comprises a heat collecting box, an upper part of the heat collecting box is provided with light transmission glass, and the bottom of the heat collecting box is provided with an absorbing coating. The heat storage device comprises the heat reservoir the inside of which is provided with a heat storage air passage, the outside of the heat storage air passage is of heat storage material, the periphery of the heat reservoir is provided with heat insulating material, and the heat collecting box is connected with the heat reservoir and the heat reservoir is arranged under the ground. The solar heat reservoir has the advantages of realizing effective storage of the solar energy, using the solar energy at any time, time and labor conservation for management, low cost, safety, clean and sanitation, and has a far-reaching meaning to environmental protection.

The invention discloses a thermocline solar thermal storage system with baffles, comprising a thermal storage tank with a thermal insulation layer wrapped on the outer surface, wherein a plurality of parallel thin baffles with low conductivity are arranged in the thermal storage tank, and two ends of the thermal storage tank are respectively provided with an opening path. The baffles are arranged in multiple layers in the thermal storage tank in a staggering manner. One or more serpentine paths are formed in the thermal storage tank under the effect of the baffles. Cambered transition bending plates are arranged at the corners of the paths. The thermocline solar thermal storage system with baffles can be applied to middle / high-temperature solar thermal power generation, and other middle / high-temperature solar energy utilization fields.

The invention discloses a solar heat-collection and heat-accumulation wall in the technical field of solar utilization for buildings. A fan is additionally arranged at a lower air port of the traditional collection and heat-accumulation wall and enables the heated air to be conveyed into an indoor personnel working area. A corrugated plate plated with a selective absorption material on the surfaceis used as a heat-collection plate, and a phase-change heat-accumulation unit is added between the heat-collection plate and a building wall body, so that the heat-collection and heat-accumulation efficiency is increased. A transparent honeycomb structure is used for replacing a traditional honeycomb structure glass plate, so that the heat-insulation effect is improved. An air port with an air door and a fan are arranged on the upper part and the lower part of the wall body. Different running strategies can be adopted in the four seasons of the year, heat supply for the interior of a room inwinter and alleviation for excessive heat in the room in summer can be realized, and natural ventilation can be realized in the case of the need of ventilation, so that the comfort degree in the roomis increased. Flexible conversion between the functions of heat collection and heat accumulation can further be realized. The solar heat-collection and heat-accumulation wall has the characteristics of being reasonable in structure, energy-saving and environment-friendly, and wide in application field, and has a wide application prospect and a high popularization value in solar buildings.

The invention relates to a system for collecting solar energy, transferring the collected solar energy to a storage device and then transferring the solar energy to load using the solar energy by the storage device. The system comprises a solar heat collector, a heat transfer device and a heat storage device of which the inside is provided with a heat storage material; the whole system consists of the solar heat collector and heat transfer medium tubes connected with the solar heat collector, the heat storage device and the heat system for a terminal; heat transfer medium adopts water or hydraulic oil and fully utilizes the characteristics of good fluidity and low viscosity, wherein the heat storage device is a vessel with double-layer wall; and the space between the double layers of the wall is vacuumized.

The invention relates to a mobile heat pipe heating valley power solid heat storage and heating device, which comprises a solid heat storage pile, a water heating cylinder and a heat exchanger, wherein electric heating pipes and heat pipe tanks are arranged on the solid heat storage pile, a heat pipe connecting channel is formed in each heat pipe tank; the heat pipes are connected in the heat pipe tanks in a sliding manner; the other ends of the heat pipes are arranged on the water heating cylinder; the ends of the heat pipes, connected with the water heating cylinder, are higher than the other ends of the heat pipes, connected in the heat pipe tank; moving wheels are arranged at the lower end of the solid heat storage pile; the moving wheels are connected with a moving connecting rod which is connected with a variable-frequency motor; the electric heating pipes are arranged on the water heating cylinder; the water inlet and outlet pipes of the water heating cylinder are connected with a plate type heat exchanger; a variable-frequency is arranged on the water inlet pipe. According to the device, night valley power can be converted to thermal energy to be stored in the solid heat storage pile and all day heating can be realized through heat taking and exchange measures.

The invention relates to a solar cross-season heat-storage heating system which comprises a solar collector, a heating tail end, a layered water tank, an underground heat storage region and an auxiliary heat source, wherein a water supply pipe of the collector is connected with a high-temperature region of the layered water tank through a first electromagnetic valve, a first circulating water pump is arranged on a water return pipe of the collector, and the water return pipe of the collector is connected with a low-temperature region of the layered water tank; the low-temperature region of the layered water tank is connected with the underground heat storage region through a second circulating pump, and the water supply pipe of the collector and the low-temperature region of the layered water tank are provided with a communicating pipe and equipped with a second electromagnetic valve; the water supply pipe at the heating tail end is connected with the first electromagnetic valve, the high-temperature region of the layered water tank and the underground heat storage region through a third circulating water pump, and the water return pipe at the heating tail end is connected with the low-temperature region of the layered water tank; and the water supply pipe of the auxiliary heat source is connected with the high-temperature region of the layered water tank and the water return pipe of the auxiliary heat source through a fourth circulating water pump for constituting a heating season trough electric heat storage system. The solar cross-season heat-storage heating system uses solar energy as main energy input and can meet the 24-hour heating needs of a building by using cross-season heat storage / heat release for balancing the seasonal peak / trough distribution of the solar energy.

The invention discloses a multi-phase-change material sub-cavity casing pipe type phase change heat accumulator. The multi-phase-change material sub-cavity casing pipe type phase change heat accumulator comprises a middle round tube, multiple sub-cavity wall faces, a heat exchange tube and multiple rib pieces, wherein the middle round tube is arranged outside a target heat accumulation object in asleeving manner; the multiple sub-cavity wall faces are arranged at the outer side of the middle round tube; the heat exchange tube is arranged at the outer sides of the sub-cavity wall faces in a sleeving manner; and the multiple rib pieces vertically penetrate the sub-cavity wall faces and the heat exchange tube, so that multiple sub-cavities are formed and used for containing different heat accumulation materials, wherein the number of the sub-cavity wall faces is greater than or equal to one, and the number of the rib pieces is greater than or equal to one. By means of the rib pieces adopted in the multi-phase-change material sub-cavity casing pipe type phase change heat accumulator, heat of hot fluid can be transmitted to the lower portion of the heat accumulator, so that heat accumulation efficiency is improved; in addition, the melting point of the PCM in the lower cavity is lower, and the PCM can be molten more easily within the same time, so that integral heat accumulation performance is remarkably improved; the PCM melting rate can be increased while the heat exchange area is increased; and the adopted PCM can absorb and release heat to achieve energy storage and release, therefore, supply and demand synchronization is achieved, and energy waste can be effectively avoided.