As a result of the decentralisation of the energy supply, supplying heat to buildings using local and district heating networks is becoming increasingly important. Furthermore, the requirements for energy-related standards of buildings are becoming more stringent, and the requirements of the German Renewable Energies Heat Act (EEWärmeG) must be taken into account for new buildings.
The primary energy factor is an important variable in the context of these energy-related requirements. The primary energy factor evaluates the quality of heat supply based on a comprehensive system approach. Common methods of calculating the primary energy factors include methods in accordance with the German Energy Savings Ordinance (EnEV) or flat-rate approaches. In cases of supply via heat networks, however, these methods do not adequately map the actual energy-related quality.
A detailed consideration and assessment in accordance with the FW 309-1 worksheet of the German Energy Efficiency Association for Heating, Cooling and CHP (AGFW) is useful in these conditions. It leads to better fulfilment of the actual energy-related quality standards in that the resulting primary energy factor often improves significantly.
As verified AGFW experts in accordance with AGFW worksheet FW-309-1, we are authorised to evaluate local/district heating networks and certify the primary energy factors. The energy-related rating certificate for district heating in accordance with FW 309-1 may only be issued by an “fp expert FW 609” who has passed the test in accordance with AGFW worksheet FW 609 and has a valid test certification.