78results about How to "Large latent heat" patented technology

The invention provides a cold accumulating agent and a preparation method thereof. The cold accumulating agent is composed of, by mass, 1%-8% of glycerol, 1%-5% of inulin, 1%-5% of gelatin, 1%-5% of thickening agent and a sodium chloride water solution. When the cold accumulating agent is prepared, the sodium chloride water solution is heated in a bath to be at the temperature of 70 DEG C, the temperature is kept constant, sodium alginate tech grade, gelatin, inulin and glycerol are sequentially added into the sodium chloride water solution, adding and stirring are performed at the same time when each component is added, and the next component is added after the added component is dissolved evenly; after all the components are added, uniform stirring is performed, the temperature is kept constant for 10 min, and cooling is performed to obtain the cold accumulating agent. The cold accumulating agent can be used repeatedly, and is thick, colloidal, good in fitness, large in latent heat, long in low-temperature duration time, easy to manufacture, low in cost, safe and free of toxicity.

The invention offers polyethylene glycol / silicon dioxide composite forming phase-change material manufacturing method. It includes the following steps: adding polyethylene glycol flour body into silica sol, and dipping accelerating agent to happen sol-gel reaction to form three-dimensional network gel; drying, smashing to form flour body; removing water and adding modifier. The formed product has high latent heat of phase change 60-140 kJ / kg, good forming capability, and stable capability while temperature is higher than phase-change by 20-50 centigrade degree, the polyethylene glycol does not leak out; thus it can be applied to electronic component thermal adjusting and controlling material, heat storage tempering textile goods, and building energy conservation wall body fields, and so on.

The invention discloses a building outer wall structure with double shaping phase change material layers. The building outer wall structure sequentially comprises the outer shaping phase change wall board layer, a first thermal insulation layer, a wall body layer, a second thermal insulation layer, the inner shaping phase change wall board layer from outside to inside, wherein the outer shaping phase change wall board layer and the inner shaping phase change wall board layer are respectively made of phase change materials of phase change temperatures of Tm1 and Tm2, the phase change temperature Tm1 is set to be minimum in cold load all year round in the expositing environment of the phase change temperature Tm1, and the solid phase change materials melt into liquid phase change materials when the wall board layer temperature is equal to or higher than Tm1; the phase change temperature Tm2 is set to be minimum in heat load all year round in the exposing environment of the phase change temperature Tm2, and the solid phase change materials melt into liquid phase change materials when the wall board layer temperature is equal to or higher than Tm2. The invention further designs the components and proportion of the phase change materials of the two shaping phase change wall board layers. By the building outer wall structure which is compact, high in adaptability, convenient to manufacture and maintain later, and the like, outer wall cold load and heat load can be lowered effectively, and overall energy consumption is lowered evidently.

The invention belongs to the field of seasonal energy accumulation heating, and particularly relates to a seasonal solar energy-phase change energy accumulation graded energy-releasing heating system and method. The system mainly comprises a solar heat collector, a phase change energy accumulation heat exchanger, a heating module and a heat exchanger, all of which are connected together through a pipeline, a valve and a circulating pump. According to the system, in non-heating season, solar heat is stored in phase change materials with different temperature levels capable of realizing stable undercooling, so as to stand in an undercooling liquid state; in heating season, two modes, namely, heating load supply by direct heat exchange between heating medium water and the heat collector and heating load supply by direct heat exchange between the heating medium water and the phase change heat exchanger, can be adopted and the phase change material units with different temperature levels are triggered by grades to be solidified and release energy according to loads in different stages. By utilizing the conception that the seasonal phase change energy accumulation graded released energy is utilized to provide heating load in winter, the system has the characteristics of being large in phase change latent heat, stable in heat release temperature, capable of being adjusted by grades, and the like, thus having wide application prospects in a seasonal heat accumulation heat supply system.

The invention provides a phase change energy storage material which has the characteristics of phase change temperature of 25-28 DEG C, great potential heat, small super-cooling degree and high stability. The phase change energy storage material is at a solid state at the temperature which is lower than 25-28 DEG C; when the temperature is higher than 25-28 DEG C, the potential heat is absorbed to carry out phase change to be changed into a liquid state. Dodecanol and paraffin are used as main raw materials, and a cross-linking agent, an initiator, an emulsifying agent and a nucleating agent are used as auxiliary materials, the main raw materials are reacted with the auxiliary materials, and then carbon chain recombination happens under the effect of the initiator, a silane coupling agent, the emulsifying agent and the like to prepare the product. The phase change temperature is 25-28 DEG C and the phase change potential heat is 156-163 KJ / Kg. The phase change energy storage material has the characteristics that the phase change temperature is the room temperature, the potential heat is high and the raw materials are wide and cheap; the material is not layered and has no sediments after being repeatedly subjected to the phase change for a plurality of times; and the potential heat value is stable and the super-cooling degree is less than 1 DEG C. After the material is packaged, the material can be combined with a building wall body and the property of absorbing the potential heat enables the wall body to have the function of adjusting the temperature.