Client:
Tilly family
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Resedastrasse, Langenhagen
Description
From starting involved into project planning, the architect gave a overview of the buildings potential to the well-preinformed owners and illustrated reasonable of possibilities modernization, costs and subsidies. The prognosticated energy savings were around 70 percent.
First measure treated a airtight insulation of all exterior building elements and of the basement ceiling. The untight roof was knocked down, a new roof with inter- and above-rafter insulation constructed. Existing windows were substituted through heat insulating 3-pane-glazing. The position of passive house windows was displaced into a new insulation layer of the exterior walls. Thereby, a 16 cm thick valuable heat insulation system was deployed.
In the living areas, six ventilation units with heat recovery are installed for continual fresh air. Through the possibility of controlling them, a optimal transverse ventilation could be realized. The existing gas condensing boiler for residual heat need and water heating is combined with a high-efficient layer storage an a solar plant for supporting heating and water heating.
Involved parties
Design:
Planen mit Energie, Dipl.-Ing. architect Eva Ibrügger
Building data
Building type:
End unit
Location:
Langenhagen
Year of construction:
1962
Modernization:
2009
Residential units:
1
Heated usable space:
140 m²
Subsidies:
KfW, BAFA, proKlima
Initial situation
EXTERIOIR WALLS:
30 cm solid, plastered masonry, HTC ? 1.5 W / (m² K)
WINDOWS:
Plastic Windows with insulating glazing, HTC ? 3.0 W / (m² K)
ROOF:
uninsulated rafter roof with plastered wood fiber boards
BASEMENT CEILING:
concrete ceiling with screed on insulation, HTC ? 1.1 W / (m² K)
VENTILATION:
Window ventilation, as well as typical old building joints and cracks
HEATING:
8 year old heating system with a gas boiler for space and water heating
Modernization in detail
EXTERIOR WALLS:
solid walls with up to 16 cm of polystyrene thermal insulation system, quality 0.032 W / (mK), HTC = 0.17 W / (m² K)
WINDOWS:
new passive house windows with 3-pane heat insulation glazing in a plastic frame and glass spacers made of plastic, HTC = 0.8 W / (m² K)
ROOF:
New roof´with 10 cm insulation on the rafters in the quality of 0.028 W / (mK) and 14 cm insulation between the rafters, quality 0.035 W / (mK), HTC = 0.14 W / (m² K)
BASEMENT CEILING:
Insulating the basement ceiling from below with 10 cm polystyrene plates of quality 0.032 W / (mK), HTC = 0.29 W / (m² K)
VENTILATION:
6 decentralized 2-watt ventilation systems with heat in the living rooms: The filters could easily be cleaned in the dishwasher
HEATING:
The existing gas boiler is still in use and has been extended by a stagnation safe solar water heater with vacuum tube solar collectors and a layer storage.
AIR CONDITIONING:
no active air conditioning installed
Measured values
AIRTIGHTNESS:
not yet measured
Calculated values
HEATING ENERGY NEEDS:
BEFORE
150 kWh/(m²a)
AFTER
44 kWh/(m²a)
SAVINGS
71 %
TOTAL ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
Gas
197 kWh/(m²a)
Electricity
18 kWh/(m²a)
AFTER
Gas
58 kWh/(m²a)
Electricity
17 kWh/(m²a)
PRIMARY ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
267 kWh/(m²a)
AFTER
109 kWh/(m²a)
SAVINGS
59 %
CO2-EMISSIONS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
59 kg/(m²a)
AFTER
25 kg/(m²a)
SAVINGS
58 %
