Wind and solar are intermittent energy resources. Therefore, the energy supply from these resources is not predictable. In theory however, this situation can be solved easily. To get a constant power output from a solar or wind power system, it is only necessary to size the system larger and to stor Contact online >>
Wind and solar are intermittent energy resources. Therefore, the energy supply from these resources is not predictable. In theory however, this situation can be solved easily. To get a constant power output from a solar or wind power system, it is only necessary to size the system larger and to store the surplus energy for later use. In practice, however, the solution is not so simple because large-scale Energy Storage Systems (ESS) are currently quite expensive.
Smart Batteries - this is perhaps the first ESS that comes to mind when the concept is mentioned. Moreover, it is in the limelight since the launch of the Tesla Powerwall. The principle is simple: surplus generation from solar or wind power systems is stored in batteries and used when it is needed or when it is considered convenient.
Batteries equipped with automation technology and installed throughout multiple homes and businesses could be used in a coordinated fashion to mitigate peaks in grid demand, while making use of spare generation capacity during low-demand hours. Automated battery banks are essentially a buffer, which is very useful for balancing variable energy sources such as wind and solar power with the variable demand of the electric power grid as a whole.
Lead-acid batteries currently dominate the market, but they can''t be charged and discharged frequently or their service life is cut short. Also, the energy lost during each charge/discharge cycle is around 15%. A smart battery technology that could overcome these limitations at an affordable price would be a great complement to solar and wind power.
Thermal Energy Storage - this ESS is commonly used in thermal solar power plants, which are based on heat concentration through mirror arrays, rather than on photovoltaic panels. The concentrated sunlight is used to raise the temperature of a substance with a high specific heat capacity, such as molten salt. Then, the stored heat is used to vaporize water and drive a steam turbine and electric generator set. To get energy during the night or during cloudy days, it is just a matter of storing enough thermal energy beforehand. A great advantage of this technology is that the steam turbines and generators used are practically the same used in power plants fired by fossil fuels.
Hydrogen Fuel Cells - this is perhaps the most complex of the three technologies. It uses the electric output from a variable renewable energy system for a process called electrolysis, in which water is separated into hydrogen and oxygen. The hydrogen is stored, and then it is used to power a fuel cell, which carries out the inverse process as electrolysis, where hydrogen and oxygen are combined into water, providing an electric power output and heat.
The advantage of fuel cells over traditional batteries is that they can run indefinitely as long as a steady supply of hydrogen and oxygen is maintained. The reaction also generates heat as a by-product, which can be used for applications such as water heating. This technology is suitable for combined heat and power applications, where both outputs from a fuel cell are useful. Hydrogen is a dense energy carrier and many argue that it can be the next alternative to the dominant energy carrier of today, the fossil fuels.
Energy storage can be deployed in bulk or distributed throughout a power grid. A good example of bulk energy storage is pumped-storage hydroelectricity. These power plants are in fact, reversible hydropower stations, and they can pump water into a reservoir when there is spare generation capacity in a power grid. When the demand is high, the water can be re-utilised to operate normally and supply power to the grid.
A good example of distributed storage is smart batteries such as the Tesla Powerwall and Powerpack. They can be installed at multiple homes and businesses, offering a considerable aggregated storage capacity.
Sri Lanka Sustainable Energy Authority72, Ananda Coomaraswamy MawathaColombo 07 Sri Lanka.
Suspendisse urna nibh, viverra non, semper suscipit, posuere a, pede.
Sensible thermal energy storage (STES) STES category comprises of materials that can store and release heat by changing its temperature. Solid STES materials include concrete, ceramics, fire bricks and ferroalloy materials. They possess high thermal conductivities and high operating temperatures up to 1200°C. However, the downside is their low heat capacities. On the other hand, liquid STES materials are superior in heat capacity but poor in thermal conductivity. Table 1 presents the most popular liquid STES materials. Noticeably the molten salts are taking over from synthetic oils (eg; Therminol VP-1), which were commonly used before.
Mr. Chamila Priyantha Ms. M.G.D Nagahawatte Publicity Division (IESL)
Introduction: Sri Lanka, renowned for its stunning natural landscapes and abundant sunshine, holds immense potential for harnessing solar energy. With an average of nearly 6 hours of sunlight per day throughout the year, solar power emerges as a sustainable and environmentally friendly solution to cater to the country''s growing energy demands. This article delves into the advantages of integrating energy storage technologies, such as batteries and thermal energy storage, into Sri Lanka''s solar energy infrastructure.
The Solar Energy Landscape: Situated close to the equator, Sri Lanka enjoys ample sunlight, making solar energy an ideal choice for meeting its energy needs. Despite the increasing affordability and efficiency of photovoltaic systems, the intermittent nature of solar power remains a challenge due to dependence on weather conditions and daylight hours.
The Role of Energy Storage: To address the intermittency of solar power, the integration of energy storage solutions becomes crucial. By combining photovoltaic systems with energy storage, Sri Lanka can ensure a consistent and reliable electricity supply, even during cloudy days and nighttime. Two prominent energy storage technologies, batteries and thermal energy storage, offer significant potential for the country.
Benefits of Integration: The integration of energy storage technologies with solar PV systems in Sri Lanka yields several noteworthy benefits:
Conclusion: Given Sri Lanka’s abundant sunlight resources, integrating photovoltaic systems with energy storage technologies is pivotal for maximizing the benefits of solar energy. This approach enhances reliability, reduces environmental impact, and promotes energy independence, aligning with the country’s pursuit of a sustainable and greener future. Investing in the integration of solar PV and energy storage emerges as a strategic step for the betterment of both the economy and the environment.
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About Sri lanka thermal energy storage
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