What is Thermal Energy?
Thermal energy is the energy that comes from the temperature of matter. The hotter the substance, the more is the vibration of molecules and hence the higher is the thermal energy.
What is Thermal Energy Storage?
Thermal energy storage is defined as a technology that allows transfer and storage of heat energy or energy from ice or water or cold air. This method is built into new technologies that complement energy solutions like solar and hydro.
The thermal energy(either chilled or hot water) is produced in the periods of off-peak electrical demand or utilization and collected in a thermal energy storage tank, then withdrawn and distributed to the facility during peak periods. The hot or chilled water enters and exits the tank via diffusers located at the top and base of the tank. The diffusers are designed to erase turbulence and allow the water in the tank to stratify with a cooler water at the base and hot water at the top. A narrow and sharp transition layer of water forms between the regions of warm and cold water.
Suppose there is a party and you are not likely to make ice when people arrive. You would buy ice, store it in freezer and use it when required. The process of thermal energy is very much similar. The electricity you utilize to make that ice is less expensive at night than during day time.
How does thermal storage energy work?
At night time during off-peak hours, the water containing 25% ethylene glycol is cooled by a chiller. The solution gets circulated in the heat exchanger within the ice bank, freezing 95% of water that surrounds the heat exchanger in the Icebank, freezing 95% of the water that is present around the heat exchanger in the tank. The water around the heat exchanger never exits the tank.
Ice is formed uniformly in the ice bank tank via counterflow heat exchanging tubes. As ice is made, the water still flows freely that prevents damage to the tank. The ice bank tank takes between six to 12 hours to charge completely.
On peak hours during daytime, the glycol solution circulates via the ice storage tank to deliver the stored energy to the building to augment electric chiller cooling. The cold glycol gets delivered at proper temperature to the cooling coil in air.
The fan blows air on the coils to supply cooling to the occupant spaces. People feel cold and never know that ice storage is being used to save money on the cost of cooling.
Thermal Energy Storage Applications:
- The thermal energy storage applications can be applied in following fields.
- In concentrating solar power plants to supply dispatchable power even during night.
- In thermal power plants to operate more and rapid load changes.
- Provide heat supply security in combined heat and power plants and temporally separate the heat and power generation.
- To recover and utilize heat in process industries which is otherwise lost.
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