All power cycles reject heat to ambient air, exhaust gasses, and/or liquid coolants. Heat recovery is the capture of a portion of the rejected thermal energy and its use in an economic manner. Recovered heat that is harnessed for effective use replaces purchased energy, reducing fuel consumption and cost, as well as emissions of harmful air or thermal pollutants. When heat recovery serves as a reliable source of supply, it can sometimes offset capital costs by reducing investment in conventional thermal energy-generating equipment.

Heat recovery is a fundamental element in many prime mover applications due to the low efficiency (20 to 40%) of power generation processes. For example, closed-cycle condensing steam turbines give up most of their exhaust energy to the environment through the condensing process; open-cycle internal combustion engines pass their exhaust energy directly to the environment. A large portion of this remaining energy may, in some cases, be captured and used in a secondary power cycle or to meet a variety of thermal loads.

Renewable Energy 101

Renewable Energy 101

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.

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