T2-2.1-05

ENERGETIKHAUS100-GERMANY’S FIRST AFFORDABLE ALL-YEAR SOLAR
HOUSE 95% HEAT FROM THE SUN
Timo Leukefeld Soli fer Solardach GmbH
Zuger Strasse 7 B, D-09599 Freiberg, Germany
leukefeld@solifer.de
ABSTRACT
The “Energetikhaus100” is the first all-year solar house affordable for average income earners in Germany. The sun provides 95 percent of annual energy for heating and hot water. A wood-burning fireplace covers the remainder. There is no need for gas, oil or heat pump. Low-temperature underfloor heating ensures optimum utilisation of the solar heat supply. The dwelling was developed jointly by Soli fer , Fasa , Eder and the Technical University Bergakademie Freiberg
.
Fig. 1: The sun provides 95 percent of annual energy for
heating and hot water in this all-year solar house.
1. INTRODUCTION
The target was to achieve at minimum cost a high solar
coverage rate of 95%. University experts screened all components for their contribution in relation to cost, specifically the collector area, storage tank volume and various thicknesses of its thermal insulation, augmented by insulation properties of structural elements and the windows' heat transfer coefficient. The remaining 5% heating requirement are covered most economically by a wood-burning fireplace stove including a heat exchanger,
doubling up as an emergency heating system.
Fig. 2: The principal of the all year solar heating system.
2. LONG-TERM HEAT STORAGE
Centrepiece of the building is the long-term heat storage tank, 7.40 metres high, containing 28,000 litres of water, extending three storeys high from cellar through first floor, made by Swiss Jenni Energietechnik . At minimal heat loss the tank retains summer solar heat for the winter season.
Proceedings of ISES Solar World Congress 2007: Solar Energy and Human Settlement
246
all year solar house.
Fig. 3.2: The position of the seasonal storage in the all year
solar house at the ground floor.
Fig. 4: The erection of the seasonal storage.
3. BUILDING MATERIALS
Unlike the Passive House , this Energetikhaus100 is made entirely of natural materials, it is brick-built and insulated with flax. For the sake of healthy living the house can be ventilated normally without a dedicated ventilation system. A further cost reduction is achieved by substituting the roof tiles with a solar roof.
4. DESIGN
For each contract the optimum roof shape, its orientation and the positioning of windows get calculated to accommodate conditions on site. The first "Energetikhaus 100" in Berthelsdorf, Germany, has a 68-degree pitched roof facing due south with of 69 square metres of collectors. Experts from the University and partnering companies have tweaked technical fittings to bare necessities, thereby also minimising failure probability and cost of maintenance.
5. COSTS
The basic model of “Energetikhaus100” has 130 square metres living area on ground floor and first floor at a turnkey cost of 220,000 Euros vs. 350,000 Euros for comparable medium range active solar dwellings . The first two such houses were erected in 2006. Energetikhaus100 has received numerous innovation awards including the “German Solar Prize 2006”. The first comparative analysis data will be presented at the Solar World Congress in
Beijing.
Fig. 5: “Energetikhause100”.
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6. REFERENCES
(1) Leukefeld T.: “Solar roof instead of roof tiles – the solar
roof as multifunctional construction and design element.” June 2003, Göteborg, Sweden, ISES 2003 Solar World Congress
(2) K udish I., Evseev G., Walter G., Leukefeld T.:
“Simulation study of solar collector with a selectively coated polymeric double walled absorber plate.” 25.
April 2001, Energy Conversation & Management, Article No. 1517
(3) Kudish I., Evseev G., Rommel M., Köhl M., Walter G.,
Leukefeld T.: “Research and development of solar collectors fabricated from polymeric material.” July 1999, Jerusalem, Israel, ISES 1999 Solar World Congress
(4) Leukefeld T., Walter G., …Comparative evaluation at
solar collectors with various construction.” October 1998, Slovakia Solar Society。