ISHS Acta Horticulturae 248: International Symposium on Models for Plant Growth, Environmental Control and Farm Management in Protected Cultivation
INFLUENCE OF THERMAL STORAGE EFFECTS OF THE SOIL ON GREENHOUSE HEAT CONSUMPTION |
| Author: | T. Hölscher |
| Abstract:
In the total system of the greenhouse the soil can be regarded as a heat storage which absorbes energy due to global radiation at daytime and emits the stored energy during the night. Simple formulations to determine the heat demand (e.g. Damrath, 1980) do not contain heat storing elements in the energy balance of the greenhouse so that the heat delivery from the soil is not considered. In order to examine the influence of storing elements on the heat demand of a greenhouse the greenhouse soil was described mathematically as a heat accumulator and integrated into the equation of energy balance of the greenhouse by means of a heat flux from the soil. Comparing the calculations showed that the heat delivery from the greenhouse soil leads to a considerable reduction of the heat demand and must not be neglected in case of low heating set points. | |
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