Solar water heater phase change heat storage material and its preparing method
A technology of phase-change heat storage materials and solar water heaters, which is applied in the field of solar heat storage materials, can solve the problems that the amount and time of solar energy cannot be well matched and coordinated, the density of water heat storage energy is low, and solar energy is not enough. Small volume and cost, small phase change volume change, and improved thermal efficiency
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Embodiment 1
[0023] A solar water heater phase change heat storage material according to the present invention, the phase change heat storage material is mixed according to the following mass percentages: 89% of sodium acetate trihydrate, 4% of barium hydroxide octahydrate, 4% of sodium borate decahydrate 2% for zinc acetate, 1% for zinc acetate, 2% for sodium dodecylbenzenesulfonate, and 2% for gelatin.
[0024] During preparation, the mixture mixed according to the above ratio is heated to a completely molten state and stirred evenly to form a eutectic mixture, and finally the eutectic mixture is encapsulated in a solar water heater heat storage device. It has been determined that its phase transition temperature is 57.2°C and its latent heat of phase transition is 243.8 kJ / kg.
Embodiment 2
[0026] Another phase-change heat storage material for solar water heaters according to the present invention is formed by mixing the following mass percentages: 82% of sodium acetate trihydrate, 7% of barium hydroxide octahydrate, 7% of boric acid decahydrate Sodium is 3%, zinc acetate is 2%, sodium dodecylbenzenesulfonate is 3%, and gelatin is 3%.
[0027] During preparation, the mixture mixed according to the above ratio is heated to a completely molten state and stirred evenly to form a eutectic mixture, and finally the eutectic mixture is encapsulated in a solar water heater heat storage device. It has been determined that its phase transition temperature is 52.8°C and its latent heat of phase transition is 220.6 kJ / kg.
Embodiment 3
[0029] Yet another solar water heater phase change heat storage material according to the present invention, the phase change heat storage material is mixed according to the following mass percentages: 85% of sodium acetate trihydrate, 5% of barium hydroxide octahydrate, 5% of boric acid decahydrate Sodium is 1%, zinc acetate is 4%, sodium dodecylbenzenesulfonate is 1%, and gelatin is 4%.
[0030] During preparation, the mixture mixed according to the above ratio is heated to a completely molten state and stirred evenly to form a eutectic mixture, and finally the eutectic mixture is encapsulated in a solar water heater heat storage device. It has been determined that its phase transition temperature is 55.3°C and its latent heat of phase transition is 232.2 kJ / kg.
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