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 ?
(Energy Purchase Agreement and Implementation Agreement) for wind, solar and bagasse co-generation power projects and conducting resource assessment of renewable energy resources in Pakistan.
Fluor Corporation (NYSE:FLR) revealed on Tuesday that it has won a contract to carry out engineering, procurement and construction of Valero Energy Corporation's combined heat and power co-generation project at its Pembroke Refinery in Wales, UK.
The company was then registered as an IPP with the PPIB for setting up a 118.8-megawatt co-generation (bagasse and imported coal-based) plant.
Caption: THIS DECOMMISSIONED HEATING PLANT is now a co-generation utility that lets the University of Minnesota's Minneapolis campus operate as an energy island.
China is planning to install biomass co-generation power capacity of more than 12 gigawatts by 2020, according to the National Energy Administration.
Arab News quoted Abdullah Al Shehry, governor of the Electricity and Co-Generation Regulatory Authority, as saying that a team of experts is developing the regulations needed to launch the project.
and Pengrowth Energy Corporation have announced an agreement for the sale and leaseback of the co-generation facilities at Pengrowth's Lindbergh thermal oil project in Cold Lake.
that will put up a 40-megawatt co-generation plant in Negros Occidental.
"In order to tap the potential of electricity generation from the sugar mills in Pakistan, the government on recommendation of AEDB has already announced the Framework for Power Co-Generation (Biogas/Biomass)," Awan said.
Abdullah Al-Hussayen, water and electricity minister, who took the awards to the king, was accompanied by Electricity & Co-Generation Regulatory Authority (ECRA) Gov.
Pemex, Mexico's state-owned oil company, said it has signed two preliminary power plant deals worth $1.4 billion to supply electricity to two of the country's refineries.The memorandums of understanding (MoU) with Japanese trading house Mitsui & Co Ltd and Canada's Atco and its Mexican partner Grupo Hermes call for co-generation power plants that will begin commercial operation during the second half of 2017.Pemex's partnership with Grupo Hermes-Atco aims to produce 638 megawatts (MW) of electricity from the new natural gas plant that will also produce 1,247 tonnes of steam per hour for power generation, with an estimated investment of $820 million.The electricity produced from the plant will supply Pemex's Miguel Hidalgo refinery in Tula, in the central state of Hidalgo.
The annual report of The Electricity and Co-Generation Regulatory Authority (ECRA) showed that Saudi Electricity Company Produces (256.688) Giga Watt Hourly of electricity in 2013, with 6.8% increment, noting that the eastern sector of Saudi Electricity Company ranks the first in the percentage of the capacity of electricity generation between its business segments by 37%.