Building substation
An installation constituting the interconnecting equipment between the supply network and the building plant for the distribution.

CHP Electricity
CHP Electricity is the amount of electrical energy that corresponds to the actual simultaneously produced useful heat in the CHP process. If part of the heat, the CHP station, is emitted to the environment, the electricity corresponding to unutilised amount of the heat considered as CHP Electricity.

CHP Heat
CHP Heat is the amount of useful heat that corresponds to the actual simultaneously produced electricity in the CHP process. If useful heat, supplied by the CHP station, is not generated simultaneously with electricity, this amount of heat be considered as CHP Heat.

CHP Power
CHP Heat is the amount of useful heat that corresponds to the actual simultaneously produced electricity in the CHP process. If useful heat, supplied by the CHP station, is not generated simultaneously with electricity, this amount of heat cannot be considered as CHP Heat.

Combined cycle power plant
Electricity or electricity and heat generating plant comprising a gas-turbine generator unit whose exhaust gases are fed to a waste-heat boiler, which may or may not have a supplementary burner, and the steam raised by the boiler is used to drive a steam-turbine generator.

Combined Heat and Power (CHP) or Co-generation
CHP or Co-generation is an energy conversion process where electricity and useful heat are produced simultaneously in one process.

Combined heat and power plant
A thermal power station in which all the steam generated in the boilers passes to turbo-generators for electricity production, but designed so that steam may be extracted at points on the turbine and/or from the turbine exhaust as backpressure steam and used to supply heat for district heating, for industrial processes, etc.

District Cooling
District Cooling means a system producing cooling services by means of a distribution network, supplying centrally produced chilled or centrally produced district heat to local chillers. District cooling is distributed on a commercial basis to a non-restricted number of customers.

District Heat
District Heat means heat distributed through pipes to customers. District Heating systems provide also the means to exploit waste heat from a number of different sources. District Heating systems can vary substantially in size, from systems supplying only a few buildings, to system that supplies entire capital cities.

District heat is produced centrally and therefore allows central removal of harmful substances, which leads to a better overall environmental protection level.

District Heating
District heating means a system supplying heat produced centrally in one or several locations to a non-restricted number of customers. It is a distributed on a commercial basis by means of a distribution network using hot water or steam as a medium.

District heating pipeline
Pipeline, including thermal insulation material and related accessories, for transport of heat by means of hot water for the purpose of district heating service.

District heating station
Installation in which exclusively heat is produced from other sources of energy.

Flow temperature
Temperature of the district heating water before heat is taken.

Heat accumulator
Installation that serves to compensate between the differences in the production and consumption of heat.

Overall efficiency
The overall efficiency of a power and heat supply station equals the quotient of the useful electricity generation plus the quantity of heat supplied to the distribution system and the total expended heat.

Primary network
District heating network starting from a heat source and which under certain conditions supplies a secondary network (dependent on the source) having different physical parameters.

Return temperature
Temperature of water after heat has been taken.

Useful Heat
Useful heat is deliver at a market price to useful applications.

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