Silent biogas CHP hit the streets

 

The large biogas CHP order from Stadtwerke Lünen has now been delivered and commissioned.  The beautiful and silent energy generators have had a profound effect on the people of the German town that protect the units against vandalism.  The special design and silence was demands made by the council as the units are dotted around residential areas and by damming the sound pressure, the noise level was reduced to whispering. 

13 CHP units are installed with a total output of 3,4 MW in the supply area of Stadtwerke Lünen. 10 plants are fed biogas from a central anaerobic digestion plant which is distributed through the city in a pipe-network particularly built for this purpose. Further 3 units are operated with natural gas to supplement the other biogas units. The heat from the CHPs is fed into the existing district heating network of the Stadtwerke Lünen.

The system highlights the main advantage of the decentralised energy structure that reduces pipeline losses.  The installation of the containerised CHPs in the middle of residential areas has required a special design to limit the noise control and make the boxes visually pleasing.  For this purpose, Alfagy's engineers developed highly sound insulated and very quiet containers that are covered with facade panels in different colours and designs.  With this urban adaption strategy, our standardised containers blend into the townscape to represent art work or garden installations.

 

Schmitt Enertec CHPCHP - Container Lünen

Super silent container after removal of the protective plastic film with wine-red barrel sand lining

 

 
Sound-LevelSound sourceHazard 
10 dB(A)Leaves waving in the wind 

Absolutely non harmful

 
20 dB(A)Silence in the radio station 
25 dB(A)Sound from breathing 
30 dB(A)Whispering, Alfagy's silent CHP at 15 me 
35 dB(A)Room Fan 
40 dB(A)Threshold for disturbing concentrationNot harmful, but disturbance of conentration 
45 dB(A)Calm appartment 
50 dB(A)Quiet radio musik, bird twitter 
55 dB(A)Radio /TV on household-noise level   
60 dB(A)Normal conversation, lawn-mower (10 m distance) 
65 dB(A)Aggravation of risk for heart deseaseMainly non harmful, but increase of risk for diseases 
70 dB(A)Vacuum cleaner, Hair dryer, Alfagy's normal CHP with sound enclosure in 1 m distance 
75 dB(A)Passenger car 
80 dB(A)Heavy traffic, machining shop, truck or bus 
85 dB(A)unpleasant, with longer effect of hearing damageHarmful with long term effect (more than 40 h a week) hearing damage 
90 dB(A)Heavy truck, Welding machine, manual grinding machine 
95 dB(A)Wood cutting machine, music on the headphones
 
 
What is biogas?What is digester gas?Biogas digestionDigester biogas