The new standard VDI 3781 Part 4-Discharge conditions for exhaust gas - Small and medium combustion systems and other installations

摘要

The completely revised standard VDI 3781 Part 4 covers discharge conditions for exhaust gases from small and medium combustion systems and from non-combustion installations. The concept of the amendment comprises two requirements, namely undisturbed removal of the exhaust gases with the free airflow and adequate dilution of the exhaust gases. Undisturbed removal of the exhaust gases in terms of the standard is attained, if the exhaust gases are emitted both outside the recirculation zone of the building with the exhaust gas discharge system and outside the recirculation zones of adjacent buildings. The standard details the conditions to fulfil these requirements for various roof forms and for various layouts of buildings. The requirement of adequate dilution is fulfilled at a sufficiently long distance between source and receptor. Here, the specifications are adopted from the 1. BlmSchV. Incorporated in this standard are provisions of standard VDI 2280 for the discharge of vapours of organic solvents. Detailed examples are provided in the Annex of the standard to clarify its concept and to facilitate its practical application. Nevertheless the standard, even if applied analogously, does not cover each specific case. Depending on the specific problem, further investigations may be necessary.