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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

Inactive Publication Date: 2007-08-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the supply and demand of solar energy cannot be well matched and coordinated in terms of quantity and time, a large amount of energy is wasted
For example, excess solar energy during the day causes solar energy to be wasted in vain, and solar energy is not enough at night and in rainy days
Moreover, in solar water heaters, the water heat storage energy storage density is low, the volume is large, and the energy storage efficiency is poor.
At present, there is no efficient and stable phase change heat storage material that can make solar energy available on demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The present invention discloses a kind of phase change heat storing material for solar water heater and its preparation process. The phase change heat storing material consists of sodium acetate trihydrate 80-90 wt%, barium hydroxide octahydrate 1-10 wt%, sodium borate decahydrate 1-5 wt%, zinc acetate 1-5 wt%, sodium dodecyl benzene sulfonate 1-5 wt% and gelatin 1-5 wt%. During the preparation, the mixture of the above said materials are heated to smelt completely to form the eutectic mixture, which is mounted inside solar water heater. The phase change heat storing material for solar water heater has phase change temperature fitting the operation temperature of solar water heater, high phase change latent heat, no overcooling and phase separation, no toxicity, no corrosion, stable performance and high repeatability, and is especially suitable for use in solar water heater.

Description

1. Technical field [0001] The invention relates to a solar heat storage material, in particular to a phase change heat storage material for a solar water heater and a preparation method thereof. 2. Background technology [0002] Energy saving and environmental protection are the most important issues in the field of energy utilization. Using phase change latent heat of phase change materials to store energy is a new environmental protection and energy saving technology. During the process of phase change, the phase change material absorbs the heat of the environment and releases heat to the environment when needed, so as to achieve the purpose of controlling the temperature of the surrounding environment and saving energy. It has broad application prospects in solar energy utilization, heat energy recovery, refrigeration and air conditioning, building energy saving, aerospace and other fields. [0003] Since the reform and opening up, my country's comprehensive national str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06F24J2/48
CPCY02E10/40
Inventor 方贵银邢琳杨帆李辉
Owner NANJING UNIV
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