The higher use of conventional fossil fuel is responsible for immense harm to surroundings, due to emanation of detrimental gases and impurities in air that leads to recent global warming. These serious challenges encouraged engineers and scientists across the world to develop technology in order to make use of renewable sources so as to prevent from environmental hazards, high cost for energy production and avoid establishing new costly power plants.
The Thermal Energy Storage system is evolved so that the solar thermal energy can be stored during peak hours of sunlight and it can be utilized during off- peak hours or during dark hours, Thermal energy storage is ineluctable for efficient use of renewable energy sources due to their fragmentary nature, exclusively solar energy, which is the most eventual energy source. Thermal energy storage offers a vital role in order to bond the gap between energy supply and its demand, which in turn, improves the performance and effectiveness of the energy systems. TES can be categorized into sensible heat storage, latent heat storage and thermo-chemical categories of heat storage systems. SHS is the most common method for storing thermal energy, e.g. water is generally used to store heat in solar heating systems and in air based heating systems, respectively. However, LHS system is considered the most preferred technique for storing thermal energy due to their wide range of availability of materials with higher thermal storage density and almost isothermal operation. Therefore, an effective power consumption management can be achieved by using LHS system to store the thermal heat or coolness in off-peak loads hours and use it during peak loads hours.
In Latent heat storage system energy is engrossed or released in order to change the phase of external fluid with the presence of Phase Change Material (PCM). The phase change can be carried out for solid-solid, solid-liquid, solid-gas or liquid-gas. The transformation of solid-solid has small latent heat when compared with solid-liquid transitions, while solid-gas and liquid gas have high latent heat. PCMs exhibit certain desirable thermal, kinetic, physical, chemical and economical properties.
Why we use Paraffin Wax as a PCM?
Paraffin wax is a white or colorless soft solid material derived from petroleum, coal and other fuels having waxy consistency. They have high molecular mass with long inline chains of hydrocarbons C31H64. There is a homogenous mixture of hydrocarbon molecules with various carbon numbers having lower melting points and poorer latent heat than pure paraffin. Paraffin wax can be easily collaborated with LHS system due to its favorable properties like non corrosive in nature, safe to use, high effectiveness.