deutschland en Service Technical glossary

Technical glossary

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Flow temperature

The temperature of the heating circuit water flowing to a radiator. As a rule, the flow temperature in radiator-heating systems is 70 °C (approx. 40 °C in floor-heating systems). The temperatures are only that high, however, when outside temperatures are low. If the outside temperature increases, flow temperatures are less.

Flue-gas losses

Flue-gas losses are unused heat energy released by the fuel (e.g. fuel oil or gas). When high-temperature flue gases are passed unused out of the flue, one talks of flue-gas losses. To maximise use of this heat, i.e. the residual energy in the flue gases, low-temperature or, better still, condensing boilers or systems can be used.

Fuel

Fuel oil, natural gas, LPG, and biogas are all used as fuels and are essentially hydrocarbon chains. Their energy content is released when they are mixed with air and combusted.


 

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