An energy system that consumes a fuel, usually natural gas, to produce both heat and electricity Cogeneration systems are very efficient because they capture and use energy that otherwise would be wasted
A process that combines the generation of electricity with a separate use of the thermal energy created For instance, a paper factory might generate its own electricity and use the surplus heat to dry its paper
The process by which two different and useful forms of energy are produced at the same time For example, while boiling water to generate electricity, the leftover steam can be sold for industrial processes or space heating
The generation of electricity and the concurrent use of rejected thermal energy as an auxiliary energy source (e g , for heating or absorption cooling) Optimum Utility Systems can evaluate cogeneration opportunities at your manufacturing or processing facility
The sequential production of electric power and useful thermal energy from a common fuel source Waste heat from an industrial process can be used to power an electric generator (bottoming cycle) Conversely, surplus heat from an electric generating plant can be used for industrial processes, or space and water heating purposes (topping cycle)
Simultaneous production of electricity and thermal or mechanical energy from the same fuel source Also used to designate a special category of gas customers
Some electric generation facilities utilize the waste heat that is produced during generation for an unrelated commercial use under a process known as cogeneration Cogeneration steam applications include manufacturing, aquaculture, and district heating Cogeneration projects are eligible for the "must purchase" requirement of PURPA
The simultaneous production of electrical energy and another form of useful thermal energy (such as heat or steam) from the same fuel source, often used for industrial, commercial, heating, or cooling purposes
(1)Any of several processes that either use waste heat produced by electricity generation to satisfy thermal needs, or process waste heat to electricity, or produce mechanical energy (2) The use of a single prime fuel source in a reciprocating engine or gas turbine to generate both electrical and thermal energy to optimize fuel efficiency The dominant demand for energy may be either electrical or thermal Usually it is thermal with excess electrical energy, if any, being transmitted into the local power supply lines (0301)
The production of both electric energy and thermal energy (such as heat or steam used for industrial, commercial, heating or cooling purposes) by means of the sequential use of energy A cogenerator that meets certain criteria may be certified as a QF under PURPA
the use of waste heat from an electrical generating plant for other purposes, such as heating Also, the use of waste heat from a high-temperature industrial process to generate electricity [return to top]
The sequential production of electricity and useful thermal energy from a common fuel source Rejected heat from industrial processes can be used to power an electric generator (bottoming cycle) Conversely, surplus heat from an electric generating plant can be used for industrial processes, or space and water heating purposes (topping cycle)
In power systems, use of steam for both power generation and heating. High-temperature, high-pressure steam from a boiler and superheater first passes through a turbine to produce power. It is exhausted at a temperature and pressure suitable for heating purposes, instead of being expanded in the turbine to the lowest possible pressure and then discharged to the condenser, which would waste the remaining energy in the steam. The steam at the higher pressure can provide large amounts of lower-temperature energy for heating buildings or evaporating brine in a chemical plant. Considerable overall energy savings can be obtained by cogeneration. See also steam engine
Energy system that consumes a fuel, usually natural gas, to produce electricity and thermal energy in the form of steam or hot air Cogeneration systems use heat energy that otherwise would be wasted
The sequential use of energy for the production of electrical and useful thermal energy The sequence can be thermal use followed by power production or the reverse, subject to the following standards: (a) At least 5 percent of the cogeneration project's total annual energy output shall be in the form of useful thermal energy (b) Where useful thermal energy follows power production, the useful annual power output plus one-half the useful annual thermal energy output equals not less than 42 5 percent of any natural gas and oil energy input
Simultaneous production of heat energy and electrical or mechanical power from the same fuel in the same facility The use of waste heat (as in steam) from an industrial process to produce electricity or the use of steam from electric power generation as a heating source
The sequential production of electricity and useful thermal energy from a common fuel source Reject heat from industrial processes can be used to power an electric generator (bottoming cycle) Conversely, surplus heat from an electric generating plant can be used for industrial processes, or space and water heating purposes (topping cycle)
The capture and use of both electricity and heat as produced by power plants or other power sources Electricity is the typical primary output but the main byproduct, heat, can also be captured and used for food processing, district heating, oil recovery and many other uses