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 ?
Europe aims to meet its environmental and energy-efficiency targets through gradual developments in cogeneration technology, skills and supply chain.
In practical terms, what cogeneration usually entails is the use of what would otherwise be wasted heat (such as a manufacturing plant's exhaust) to produce additional energy benefit, such as to provide heat or electricity for the building in which it is operating.
Cogeneration systems offer a host of advantages, enabling an owner to gain a degree of energy independence, while improving power quality, reliability and lowering overall costs.
We've been looking for an entrepreneur who would be interested in developing a silviculture project in conjunction with the Chapleau cogeneration plant," Freeborn says.
Germany, the UK, Italy, and Poland have displayed significant cogeneration potential and accomplishments.
An example of a small-scale cogeneration application might be its use to generate electricity onsite in a building to supplement utility-supplied power while also providing hot water for the building's domestic use.
Strong's announcement also jeopardizes the future of two TransCanada Pipelines' cogeneration projects in Kapuskasing and North Bay and of an Iroquois Falls project planned by Northland Power and Abitibi-Price Inc.
Until now solar cogeneration applications included solar hot water, space heating and electricity - SoCalGas' solar cooling application is a great demonstration of solar cogeneration's versatility in addressing customers' diverse energy needs and opens up the vast cooling market to Cogenra's solar cooling solution.
2) the supply, installation and commissioning of 2 units remanufactured cogeneration units;
Cogeneration can be designed "in parallel" with a utility to supply partial loads and in an "islanded" configuration operated independently from the utility.
While Hydro previously actively pursued the purchase of energy from private cogeneration plants, the utility revised its plans in December because demand for electricity was decreasing.