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Passive Schools

In a Passive School the heat from 25 pupils and a teacher (1.5kw) is enough to keep the classroom comfortable for the whole year. Due of the success of the earlier Passive Schools every new School in Frankfurt will now be built to Passive Standards.

Passive Schools Students

I believe that Global warming awareness is best taught from an early age and children who study in a Passive School will have a much lower Carbon footprint in later life. If the backup heating fails for a few days a highly insulated Passive School will never get colder than 17-18 degrees and because of the Triple Glazing the seat near the window is always comfortable.

Riedbergschool

The high level of heavy insulation guarantees a comfortable indoor climate throughout the year. Using very little energy, the school stays warm during the winter and cool during the summer. The walls floors and roofs of the Passive Schools have been insulated to 0.15 or better with Triple glazed (0.8 U-value) windows. Airtightness results as good as N50=0.26/h have been achieved which is 40 times more airtight than the minimum air leakage allowed under the new Part L regulations due out in July 08. All Cold Bridges have been eliminated in the Construction Phase.

passive school

Heat Recovery Ventilation was installed to minimise energy losses through ventilation and to ensures that the pupils get plenty of fresh air to keep them sharp and alert while at school. This also ensures that the school is kept healthy and fresh with no mould or fungus growth arising from condensation of moist air on cold surfaces. HRV guarantees superior air quality and low CO2 levels without the need to open the windows, creating a well ventilated and quiet learning environment that also supports the pupils health.

passive school

The payback period for passive house technology in schools is usually less than 15 years. Some passive house schools in Germany did not incur any extra costs at all. The payback period for one Passive schools was thought to have been 38 years in 2003 but with the increase in the price of Oil this payback period was reduced to 12 years in 2005 and should be much less now with Oil reaching $130/barrel. This will result in savings of several thousands per year after the payback period.Irish Schools built using the traditional method will cost more to heat over the next 25 years than they origionally cost to build.

passive school

The passive house concept cuts a school building's heat demand by up to 90 per cent, providing reliable protection against rising energy prices. Money otherwise spent on heating can be invested in education.

The city of Frankfurt, Germany, seat of the European central bank and Germany's main business hub, decided in 2007 that with immediate effect all schools and daycares and all official buildings have to be built and, if economically feasible, renovated to the passive house standard.


Riedbergschool, Frankfurt

Riedbergschool
Basic Facts
  • Opened in : 2004
  • Area : 8,000 m2(6,300 m2 + gym)
  • Occupants : 650 - 675
  • Construction type: concrete
  • Ventilation : three vent. centres
  • Heating : wood pellets stoves
  • Air tightness: n50=0.46/h
  • Extras: 30 kW photovoltaics
Riedbergschool

Riedbergschool, Frankfurt

energetic performanc
  • Calculated heat demand : 15 kWh/(m2a)
  • U-value walls : 0,17 W/(m2K)
  • U-value window frames : 0,8 W/(m2K)
  • U-value glazing : 0,6 W/(m2K)
  • U-value roof : 0,11 W/(m2K)
  • U-value ground slab : 0,21 W/(m2K)
Riedbergschool

The internal Winter temperature was between 19.5 and 20.6 °C.
Almost no summer overheating occured, the average in 2006 (warm summer) was 22.9 °C.
The CO2 concentration was almost always under the recommended threshold of 1,500 ppm.
The heat consumption during the winter of 2005/06 was 90% below the average German School.

Cost
  • Total : 16.7 mio £
  • Additional costs : ~ 5 %
  • Construction costs : 1,110 £/m2
  • Est. payback period in 2003 : 38 years
  • Est. payback period in 2005 : 12 years

With oil prices hitting 130 $ / barrel payback period is even shorter today.

After payback period energy savings of several thousand euros per year.

Riedbergschool

Heinrich v. Kleist school, Frankfurt

Heinrich v. Kleist school
Basic Facts
  • Opened in : 2007
  • Area : 1,338 m2
  • Construction type: extension, concrete
  • Ventilation : Wolf KG 160 Gigant
  • Heating : shares heating with existing building
  • Air tightness: n50=0.24/h
  • Extras: green roof insulation is CFC-free
Heinrich v. Kleist school
Energetic Performance / Costs
  • Calculated heat demand : 14 kWh/(m2a)equals 1.4 liters of oil per square meter per year
  • U-value walls : 0.126 W/(m2K), mineral fibre insulation
  • U-value window frames: 0.81 W/(m2K)
  • U-value glazing : 0.6 W/(m2K)
  • U-value roof : 0.095 W/(m2K)EPS insulation
  • U-value ground slab : 0.144 W/(m2K)EPS and foam glass
  • Total costs: 2,692 £/m2
  • Construction costs: 2,053 £/m2

Schwanheim daycare, Frankfurt

Schwanheim daycare
Basic Facts
  • Construction time : 08/2005 - 10/2006
  • Area : 775.97 m2
  • Occupants : 80
  • Construction type : timberframe
  • Ventilation : MHRV,81 % heat recovery, Heating condensing gas boiler
  • Air tightness : n50= 0.6/h
  • The building is divided into three zones:
  • North: Service functions (less sunshine)
  • Middle: access to first floor as play street
  • South: group rooms (large windows, sunny)
Schwanheim daycare
Energetic Performance / Costs
  • Calculated heat demand : 15 kWh/(m2a)equals 1.5 liters of oil per square meter per year
  • U-value walls : 0.114 W/(m2K), cellulose and wood fibre insulation
  • U-value window frames: 0.81 W/(m2K)
  • U-value glazing : 0.6 W/(m2K)
  • U-value roof : 0.091 W/(m2K)EPS insulation
  • U-value ground slab : 0.139 W/(m2K)foam glass
  • Total costs: 2.65 mio £, 3,357 £/m2
  • Construction costs: 1.07 mio £, 1,360 £/m2
Schwanheim daycare
Schwanheim daycare

Altkonigsblick daycare, Frankfurt

Altk�nigsblick daycare
Basic Facts
  • Completed in : 2007
  • Area : 919 m2
  • Occupants : 26
  • Construction type : timberframe
  • Ventilation : mechanical heat recovery ventilation 80 % heat recovery
  • Heating : district heating
  • Air tightness : n50= 0.4/h
Altk�nigsblick daycare
Energetic Performance / Costs
  • Calculated heat demand : 15 kWh/(m2a)equals 1.5 liters of oil per square meter per year
  • U-value walls : 0.106 - 0.146 W/(m2K)
  • U-value window frames: 0.73 - 1.0 W/(m2K)
  • U-value glazing : 0.6 W/(m2K)
  • U-value roof : 0.069 W/(m2K)
  • U-value ground slab : 0.124 W/(m2K)
  • Total costs: 2.08 mio £ / 2,270 £/m2
  • Construction costs: 1.41 mio £ / 1,538 £/m2
  • Calc. payback period (2007): 11.6 years
Altk�nigsblick daycare

Preungesheim primary school, Frankfurt

Preungesheim primary school
Basic Facts
  • Construction time : 05/2006 - 08/2007
  • Area : 5,152 m2
  • Occupants : 530
  • Construction type : concrete
  • Ventilation : MHRV 77 % heat recovery
  • Heating : wood pellet stove
  • Air tightness : n50= 0.5/h
  • Primary school, daycare, youth center and gym
Preungesheim primary school
Basic Facts
  • Construction time : 05/2006 - 08/2007
  • Area : 5,152 m2
  • Occupants : 530
  • Construction type : concrete
  • Ventilation : MHRV 77 % heat recovery
  • Heating : wood pellet stove
  • Air tightness : n50= 0.5/h
  • Primary school, daycare, youth center and gym
Preungesheim primary school
Energetic Performance / Costs
  • Calculated heat demand : 15 kWh/(m2a)equals 1.5 liters of oil per square meter per year
  • U-value walls : 0.13 W/(m2K)
  • U-value window frames: 0.8 W/(m2K)
  • U-value glazing : 0.6 W/(m2K)
  • U-value roof : 0.092 W/(m2K)
  • U-value ground slab : 0.133 - 0.164 W/(m2K)
  • Total costs: 21,85 mio £
  • Construction costs: 1.41 mio £ / 1,538 £/m2
  • Calc. payback period (2008): 16.3 years
Preungesheim primary school