Solar water heater using phase change material as heat storage

First,

Definition of Phase Change Materials
Phase change materials (PCMs) are substances that change their shape with temperature and provide latent heat. The process of phase change material from solid to liquid or from liquid to solid is called phase change process. At this time, phase change material will absorb or release a lot of latent heat.

Second,
Characteristics of Phase Change Materials
1. High heat storage, high efficiency, ensure hot water supply in the system
2. Remove the traditional solar water heater water tank and save space.
3. Make the installation of water heater no longer subject to floor restrictions, installation and use more convenient.
4. Make the hot water supply of the system no longer affected by the weather
5. The whole system has no power design, less heat loss, more energy-saving and environmental protection.

Third,

Phase Change Material Parameters of Water Heaters

Fourth.
Structure of Phase Change Water Heater Collector Tube

         Application Scheme of Solar Energy Heating System

First,
Characteristics of Phase Change Materials
1. High energy storage density, high heat resistance and high heat conductivity
2. Low expansibility and non-corrosiveness
3. Non-toxic, harmless, energy-saving and environmental protection
4. It can store heat when there is sunshine and provide heat source when there is no sunshine.

Second.
Current Situation of Heating Industry
1. Heat storage
As a kind of intermittent energy, solar radiation is affected by the factors of day and night, season, rain and snow weather, showing discontinuity and instability.
Phase change materials, as a reliable and excellent heat storage material, can solve this problem well. They can store heat during the period of obtaining solar energy and provide heat source during the period of no sunshine.
2. Circulating System Problems
Most domestic solar water heaters and public solar water heating systems in China adopt a single cycle system, that is, the heated water in the collector enters the water tank directly for use.
In the world, domestic solar water heaters, especially public solar water heaters, generally adopt a dual-cycle system, that is, the heat transfer medium is heated in the collector, and then the water in the storage tank is heated by the heat exchanger for use.

Third.
Schematic diagram of system scheme

Fourth.
Energy storage mode
When the system maintains the hot water temperature close to the phase change temperature, the heat storage capacity of the same volume phase change heat storage ball is 60 times that of water.

2. Phase change materials with phase change temperatures of 89 C, 58 C and 34 C were used to maximize heat storage by using phase change materials with multiple phase change temperature points.

Fifth.
Internal structure of heat accumulator

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