where m is the mass flow rate and the subscript in stands for inlet and out for outlet, E n is the rate of net energy transfer in, Eout is the rate of net energy transfer out by heat, work, and mass, Q = Qnet n = Qn — Qout is the rate of net heat input, W = Wnett out = Wout — Win is the rate of net work output, and h is the enthalpy per unit mass.
The general exergy balance can be expressed in the rate form as
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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.