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PASSIVE SOLAR ENERGY FOR DOMESTIC AND COMMERCIAL SPACE HEATING

Obiettivo

The aim of the project is to demonstrate the reduction of energy need of a mixed building complex (commercial use and dwellings) by strict application of advanced energy saving construction principles. The remaining energy requirement of the dwellings will be met by use of waste heat from the commercially used part of the building with the help of a gas driven heat pump and by intensive use of passive solar energy.
The Fraunhofer Institute Freiburg is responsible for the monitoring campaign. A first study of the results of the solar passive system has been submitted by the Technische Universitaet Darmstadt, Insitute for Thermal Systems Prof. Dr.-Ing. W. Kast, reporting period March 15th to April 14th 1987.
The gas driven heat pump was unfortunately not performing during this period. The passive solar impact of the solar courtyard on the adjacent dwellings is minimal and is smaller than the impact of the individual heating patterns of the tennants. Further monitoring results are needed to investigate the solar contribution to space heating.
The building is finished; all space used for commercial purposes and as dwellings is fully occupied. All energy systems, including the gas fired heat pump are in operation. However, the operation of the whole system was rather frequently disturbed in the last year due to technical problems with the heat pump, vibration problems in the pipings and flow andpressure control problems in the rather complex hydraulic systems. There is a good prospect that these problems will be overcome in the first months 1988.
The project provides the construction of a building covering a surface of 3 000 m2, comprising different floors: three sub-basement floors for parkings, ground-floor and 1-floor for commercial use, 2. and 3. floor comprising 42 social dwellings. The building is situated in the center of Heppenheim, a small town on the westside of the Odenwald (Hessen).
The reduction in energy requirement is mainly obtained by the reduction of heat-transfer coefficients for walls, windows and roofs which are more severe than these imposed by the official German regulations in this field. The average in values are :
outside wall : 0,3 W/m3 K
- roof : 0,3 W/m3 K
- windows day : 2,6 W/m3 K
- windows night : 1.3 W/m3 K
- walls to the solar courtyard : 0,6 W/m3 K. The back-up heating system of the building is based on gas-fired conventional boilers of a total capacity of 915 kW feeding into a hot air heating system. The heat of the exhaust air of this part of the building is used, by the means of gas driven heat pump to heat the dwellings with a maximum heating capacity of 471 kW.
The use of passive solar energy takes place by increased glass surfaces of the dwellings to the south and a large common patio on the level of the dwellings covered by an important glass structure. The heat captured by this kind of greenhouse is partly (if the temperature is high enough) used for space heating or serves as a heat source for the heat-pumps. Shadowing facilities for high insolation periods are provided.
It is expected that the energy need for space-heating of the dwellings for the months of October till March will be reduced by 50%. An extensive 2-years monitoring programme will be carried out considering the energetic aspects of the project as well as the acceptance behaviour of the inhabitants of the dwellings.

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Coordinatore

INGENIEURBUERO WELKER
Contributo UE
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Indirizzo
LEHRSTRAßE 28
6148 HEPPENHEIM
Germania

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