Cogeneration

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cogeneration

[‚kō‚jen·ə′rā·shən]
(mechanical engineering)
The simultaneous on-site generation of electric energy and process steam or heat from the same plant.

Cogeneration

The simultaneous production of electrical or mechanical energy (power) and useful thermal energy from the same fuel/energy source such as oil, coal, gas, biomass, or solar panels. Conventionally, heat is emitted through cooling towers or flue gas is lost, but cogeneration makes use of that heat. A cogeneration plant is often referred to as a combined heat and power plant.

Cogeneration

The sequential production of electricity and thermal energy in the form of heat or steam, or useful mechanical work, such as shaft power, from the same fuel source. Cogeneration projects are typically represented by two basic types of power cycles, topping or bottoming. The topping cycle has the widest industrial application.

The topping cycle utilizes the primary energy source to generate electrical or mechanical power. Then the rejected heat, in the form of useful thermal energy, is supplied to the process. The cycle consists of a combustion turbine-generator, with the turbine exhaust gases directed into a waste-heat-recovery boiler that converts the exhaust gas heat into steam which drives a steam turbine, extracting steam to the process while driving an electric generator. This cycle is commonly referred to as a combined cycle arrangement. Combustion turbine-generators, steam turbine-generator sets, and reciprocating internal-combustion-engine generators are representative of the major equipment components utilized in a topping cycle. See Generator, Steam turbine, Turbine

A bottoming cycle has the primary energy source applied to a useful heating process. The reject heat from the process is then used to generate electrical power. The typical bottoming cycle directs waste heat from a process to a waste-heat-recovery boiler that converts this thermal energy to steam which is supplied to a steam turbine, extracting steam to the process and also generating electrical power. See Electric power generation

Cogeneration for building and district space heating and cooling purposes consists of producing electricity and sequentially utilizing useful energy in the form of steam, hot water, or direct exhaust gases. The two most common heating, ventilating, and air-conditioning cycles are the vapor compression cycle and the absorption cycle. See Air conditioning, Central heating and cooling

cogeneration

In a building, the on-site electric power generation utilizing both the electrical power and steam or hot water which is developed; in some municipalities in the US, if excess electrical power is generated, it may be sold to the utility.
References in periodicals archive ?
Murtaza Mughal said that in 2009 the government approved 19 cents tariff for rental power plants and 14 cents tariff for IPPs but refused to allow sugar millers tariff of 11 cents despite the fact that co-generation would have no impact on forex reserves as no imports were involved.
The co-generation plant owned by Kuwait's Ministry of Electricity and Water is located within the Shuaiba Industrial Authority Area, about 40 kilometers from Kuwait City.
He reminded that EU legislation provided for stimulating high-efficiency co-generation by heating utilities, adding that prices of this type of energy were dependent on prices of natural gas and coal.
Noura Laroussi, Director General of the National Agency for Energy Management (ANME), said "eight co-generation units were identified up to late 2011 in the areas of paper, building materials, food industry and aeronautics, with a total electric power capacity of 37 MW, which represents 34% of the targeted potential.
Marys Paper in order to protect local jobs and revitalize the forestry sector and this new provincial power agreement makes it possible for the mill to build a biomass co-generation plant, which will provide it with long-term stability and greater job security for its workers," said Orazietti in a Nov.
The Russian Far East co-generation project involves the introduction of high-efficiency co-generation systems in cities and towns along the 1800-kilometer long pipeline that is scheduled to begin operating in 2012 and will link Sakhalin and Vladivostok via Khabarovsk as a part of the Russian government's efforts to raise energy efficiency and protect the environment.
Betting on rising prices of oil and electricity in the long-term, Grand Pacific began raising capital to invest in the co-generation plant.
Until this stage will be implemented, the co-generation plant will burn natural gas
Pratt & Whitney has dedicated a new energy efficient, environmentally friendly co-generation facility capable of generating about two-thirds of the site electrical energy and the majority of the steam for winter heating, summer cooling and manufacturing process equipment.
The acquired facilities include a power, steam, and chilled water supply facility for a large shopping mall (Kings Plaza Project), a district chilled water supply facility (Portland District Cooling Project), a co-generation facility for a Japanese chemical company, and chilled water and central plant facilities for a university and movie studio (Kingston Project), and a biomass power plant providing renewable energy to a large California electric utility (Fairhaven Project).
Thanks to a host of design and engineering features, the building will reach a new standard of performance, including cutting energy and water use by 50%, generating nearly 70% of its annual power on-site with efficient, reliable co-generation, and almost completely eliminating run-off to the city's stormwater system.
At first the problems of energy demand analysis, which is the key point of a co-generation plant sizing procedure, are discused.