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Breathing façade instead of ventilation system

Renovation of Kreishaus Siegen

Technical renovation
Removal of induction air conditioning
Window ventilation instead of mechanical ventilation
Improvement of fire protection
Renovation of the windows and insulation of the façade
Desired outcome: Cost-effective revitalization of model character


Which façade for a high-rise building?

PROBLEM DEFINITION
  • Loud and draughty induction plant from 1976
  • Light-absorbing sun-protection glass with internal Vertiso glare protection
SOLUTION APPROACH
  • Combination window with sunblinds outside
  • Slats between baffle plate and glazing
  • Cooling ceilings
  • Radiators
tmb_siegen tmb_siegen-sim-1 tmb_temperaturen tmb_siegen-sim-2 tmb_vertikalschnitt tmb_windrichtung

Daylight factors in accordance with DIN V 18599-4

  ExistingNew F04 façade
Light transmission of the façade τD65,SNA 0,50 0,69
Framework reduction factor k1 0,97 0,79
Daylight factor D 1,85% 2,10%
Brightness in the room +14%

Natural ventilation of a high-rise building?

ISSUES
  • Choice between
  • uncontrolled air exchange
  • high ventilation heat losses
  • strong draughts
  • or
  • windows permanently closed
  • inadequate ventilation
  • insufficient air quality
  • mould growth of thermal bridges
IDEA AND SOLUTION
  • free ventilation with ventilation element as wind pressure limiter
  • self-regulating
  • simple
  • easy to understand
  • robust
  • energy saving

Pressure-limiting ventilation element

CONCEPT OF THE FSL VENTILATION ELEMENT
  • natural ventilation due to wind pressure
  • overflow of air within a floor
  • defined pressure and volume flow limitation for air intake and discharge from the building
  • axial intake and discharge air units alternately
  • non-return valve against unwanted air currents
  • no fan
  • no heating or cooling register
tmb_winddruckbegrenzer-1 tmb_winddruckbegrenzer-messprotokoll tmb_winddruckbegrenzer-einbau tmb_winddruckbegrenzer-schnitt

Wind pressure limiter

TECHNICAL DATA
  • flexible presetting of the maximum flow rate
  • non-return valve
  • sound insulation baffle (standard sound level difference approx. 55 dB)
  • construction free of thermal bridges
  • manual, needs-based operation via the fittings
  • maintenance-free
  • 530 occupied office axes
  • FSL special series

Energy saving (measured values)

Referenzwert Referenzwert
SAVINGS
Power

72% (annually)

Heat

72% (annually)

CO2
1.600 tons or 65% (annually)
Power demand and peak load dropped sharply
Energy certificate in new construction quality
Primary energy requirement 31% better
Building shell 57% better

Breathing façade instead of ventilation system / Conclusion

Automatic free ventilation has a very high potential for the refurbishment of high-rise buildings.
The system is simple, robust and very inexpensive compared to full air conditioning.
Room conditioning should be done with cooling ceilings / radiators.
The energy-saving potential is surprisingly high.
The client and the staff are very satisfied with the system.




Participants

Kreis Siegen-Wittgenstein
gmp Architekten, Aachen
gpa Goebel Projektsteuerung Airport Consulting, Münster
Ebert Ingenieure, Nürnberg u. Düsseldorf
KonTec Fassadenplanung, Dormagen
Fassadenlüfter FSL GmbH & Co. KG, Neukirchen-Vluyn