THEREMAL ENERGY STORING

Thermal Energy Storing Systems are considered one of the most important load displacement techniques, effectively contributing in reducing and shifting the peak loads that represent the biggest burden for the electricity facilities, technically and economically.

Advantages of Thermal Energy Storing:

Thermal Energy storing systems store the power during nighttime to take advantage of the low external temperatures and lack of demand for electricity and then use the stored energy during the daytime hours to provide the power plants or buildings with the required cooling energy.

The importance of the Thermal Energy storing systems increased when the generated electrical power from the power plants could not meet the requirements of the electrical loads at the peak hours, which are mostly during limited hours in the summer days. It is proven that instant expansion is needed in the generation capacities and networks reinforcement. This forms a high investment cost and technical burdens for SEC to meet the demand for electrical power. Specifically, in the case of air conditioning loads that results in an increase of the maximum loads during one period coinciding with highest temperature leading to high peak load for a short duration of time.

When demand for electrical power is low, Thermal Energy storing systems displace the required electrical load during peak hours until the evening (lowest electric consumption periods).

Thermal Energy storing method depends on the utilization of the electric power during the minimum load period to store the energy, by using chilled water or ice cube tanks and then reusing it during the maximum loads periods by passing cooling water through these tanks. As a result, the cooling units (chillers) help in reducing the electric power of the compressor and the pump due to the decrease in temperature difference when water enters or exits the cooling unit. The temperature drops when the cooling water coming out of the building has passed through the unit and after absorbing the heat from it through coils inside the cooling tanks. Consequently, temperature declines and then the thermal load decreases during the peak period; and all these will help in reducing the power consumption and pressure on the power plants.

Another advantage of the Thermal Energy storing system is that it reduces cooling units, loads, pumps and pipes.

In case this system is applied in an existing building, it can be expanded and cooled by the same cooling units of the building before the expansion while adding cooling tanks instead of increasing the capacity of cooling units.

Types of Thermal Energy Storing:

The power is stored in these systems either by using the chilled water, ice or special types of salts as a storage medium. Since water is cheap and has good properties compared to salts, water is commonly used in the power storage purposes, whether in its liquid or frozen state.

Cases Where Thermal Energy Storing Is Regarded As a Practical Solution :

1- Places requiring high cooling loads for a limited time during the peak period throughout the day. (The total available area for cooling is about 2600 square meter or more).

2- Places that consume large amounts of electrical power for many purposes, including air conditioning, which forms the highest load (at least, 30% - 50% of the total electricity consumption of the building).

3- Low price of electricity during the minimum load period in order to rationalize the consumption of electric power within the peak hours throughout the day.

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Methods of Encouraging the Customers to Use Thermal Energy Storing:

- Through applying the Time of Use (TOU) Tariff program and providing discounted tariff outside the peak hours.

- Through the reduction or cancellation of customs duties.

- Through giving the priority of commercial clearances and licenses to manufacturers and suppliers of high-efficiency appliances, and facilitating the procedures.

- Developing regulations to encourage importation and usage of high efficiency appliances.