3. Efficiency of condensing boilers

3.1 High yields

The condensing boiler uses not only the lower calorific value (LHV) of a fuel, but also its higher calorific value (HCV).

For efficiency calculations, French and European standards use ICP as the reference.

Lower calorific value and higher calorific value

The net calorific value (NCV) indicates the amount of heat that can be produced with a given quantity of fuel (solid, liquid or gaseous). With this reference value, combustion products are available in gaseous form. The gross calorific value (GCV) includes, in relation to the net calorific value (NCV), a percentage of additional energy in the form of heat by condensation of water vapor, known as "latent heat".

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Efficiency of condensing boilers

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Oil-fired and condensing boilers

Bibliography

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Les techniques du chauffage. - [TBA 2 600]...

Standards and norms

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Code for acceptance tests on stationary steam generators of the power station type - BS 2885 - 1974

Regulations

Decree no. 2010-1269 of October 26, 2010 on the thermal characteristics and energy performance of buildings

Arrêté du 26 octobre 2010 relatif aux caractéristiques thermiques et aux exigences de performance énergétique des bâtiments nouveaux et des parties nouvelles de bâtiments (Decree of October 26, 2010 on the thermal characteristics and energy performance requirements of new buildings and new parts...