ISHS Acta Horticulturae 312: European Seminar New Technologies for the Rational Use of Energy in Greenhouse Horticulture in Northern Europe
THE USE OF WASTE HEAT FROM A POWER PLANT FOR GREENHOUSE HEATING IN COMMERCIAL APPLICATION IN GERMANY |
| Author: | H. Bredenbeck |
| Abstract:
Since 1987 at the Niederau  em power station near Cologne 6 commercial greenhouse enterprises have been established, which are exclusively heated with the water from the cooling tower of the brown coal fired 2,700 MWel power plant.
The totally installed greenhouse area is approximately 53,000 m2; venlo type covered with single glass and thermal screens.
The forward temperature of the water differs from 30 °C in winter to 40 °C in summer.
The system employes water-air heat exchangers with forced ventilation controlled by a climate computer.
In winter 1991 the system was able to keep an indoor temperature of up to 22 °C, even with an outside temperature of -14 °C. The ratio of electricity used to gained heat energy varies with the forward temperature and the required indoor temperature.
It raises from about 1:20 with worse conditions (e.g. low forward and high indoor temperature) to approximately 1:30 with good conditions (high forward and low indoor temperature) respectively.
Climatic conditions are reported to be favorable for the plant growth (pot plants and cut flowers).
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