It has been suggested that Combined cycle hydrogen power plant be merged into this article. (Discuss) Proposed since February 2024.
Assembly of heat engines that work in tandem from the same source of heat
"NGCC" redirects here. For the ship prefix, see Canadian Coast Guard Ship.
"Combined cycle gas turbine" redirects here. Not to be confused with Closed-cycle gas turbine.
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Gateway Generating Station, a 530-megawatt combined cycle natural gas-fired power station in Contra Costa County, California.
A combined cycle power plant is an assembly of heat engines that work in tandem from the same source of heat, converting it into mechanical energy. On land, when used to make electricity the most common type is called a combined cycle gas turbine (CCGT) plant, which is a kind of gas-fired power plant. The same principle is also used for marine propulsion, where it is called a combined gas and steam (COGAS) plant. Combining two or more thermodynamic cycles improves overall efficiency, which reduces fuel costs.
The principle is that after completing its cycle in the first engine, the working fluid (the exhaust) is still hot enough that a second subsequent heat engine can extract energy from the heat in the exhaust. Usually the heat passes through a heat exchanger so that the two engines can use different working fluids.
By generating power from multiple streams of work, the overall efficiency can be increased by 50–60%. That is, from an overall efficiency of the system of say 34% for a simple cycle, to as much as 64% net for the turbine alone in specified conditions for a combined cycle.[1]
^"HA technology now available at industry-first 64 percent efficiency" (Press release). GE Power. December 4, 2017.
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