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At the Vestforbrænding plant in Glostrup waste is incinerated in large furnaces and flue-gases are cooled continuously with water that turns into steam. Steam turns into movement, power and heating in turbines, generators and heat exchangers.
Heat is transferred to consumer in the form of hot water through insulated underground pipes; one supply pipe and one return pipe.
In all buildings receiving district heating a so-called district heat station is established transferring the heat from the Vestforbrænding grid to the water and hot water system of the building. Transfer takes place in a heat exchanger transferring heat without direct contact between the water from the grid and the water in the in-house systems.
When the district heating water has given off its heat for heating and hot water at the location of the consumer it is returned to Vestforbrænding to be re-heated in the incineration plant. Thus, the district heating grid is a closed system where water is alternately heated and cooled.