The collector efficiency, nc, can be expressed using the well-known formula: n= ^ = Fr ( T ) - Fr Ul ^liljal (20)
where Qu is the useful energy rate gained by the collector, Ac is the collector area, G is the incident radiation on horizontal surface, FR is the heat removal factor, (id) is the transmittance-absorbance product, UL is the collector overall heat transfer loss coefficient, Ti is the inlet collector temperature, and Ta is the ambient temperature. The storage tank is modeled as a stratified tank (Duffie et al., 1991). The energy balance of the water in the storage tank accounts for energy gain from the collector, energy removed by the load, and energy lost to the surroundings.The equation describing these quantities is given by
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.