Researchers at the University of Arkansas have developed a solar energy storage system that can store heat absorbed by solar panels. The cost of this system is lower than that of conventional energy storage systems.

The working principle of the conventional energy storage system is to absorb solar heat using molten salt furnace or petroleum or rock layer devices. This is the working principle of a general energy storage system.

Efficient solar energy storage system comes out

Panneer Selvam, Micah Hale, and Matt Strasser demonstrated the new thermal energy storage test system outside the engineering research center in Fayetteville, USA. The rock layer device thermal energy storage system is currently the lowest cost and most efficient thermal energy storage system. The rock layer device energy storage system can indeed store energy, but there is room for improvement in the energy storage system.

The rock layer energy storage system expands or contracts when the temperature rises or falls. This is what we call the ratchet effect. As the rock expands thermally (above the shape of the rock when it is loaded into the accumulator), the wall of the accumulator is stressed. This is the same as winter ice expansion and squeezing your bottle or pipe.

Civil engineering professor Panneer Selvam said: The most efficient collection of solar energy in conventional energy storage systems can meet the US Department of Energy's requirements for solar energy storage systems. However, there are some problems with this method. Fillers in conventional energy storage systems can stress the walls of the energy storage system and damage the walls. This creates the inefficiency we consider and, more importantly, can cause catastrophic failure of the memory wall.

new method

Researchers at the University of Arkansas designed a structural variable-temperature energy storage system. The system is made up of concrete slabs placed in parallel, with concrete tubes interspersed with steel tubes. The steel pipe absorbs the heat absorbed by the solar panel and transfers it to the concrete slab until the temperature reaches boiling water or the temperature at which water vapor is generated. The system can also supply heat to a device that works with heat as energy, such as a Stirling engine or thermoelectric module.

The variable temperature energy storage system can work at 600 degrees Celsius, and the working efficiency is 93.9%.

The cost of the system is only $0.78perkWh, which is far below the $15perkWh target set by the US Department of Energy.

Let us look at the advantages and disadvantages of the system compared to the battery: lead-acid battery cost is $25perkWh, lithium-iron battery cost is $50 to $100perkWh, depending on battery type and usage habits Lithium-iron battery life is lead-acid 4 times the battery.

Due to the low cost of this energy storage system, it can promote the development of the solar energy industry. When this kind of energy storage system is applied, the market share of solar energy will be higher. (Compiled by David)

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