On a promising sustainable energy system and its control - the passive greenhouse

The paper is synthesizing some research results on the energetic passive greenhouses, that are independent of any conventional infrastructure. These greenhouses constitute a fundamental sustainable agricultural resource and offer us an opportunity for a global scale ecological reconstruction. We present the passive greenhouse structure, which has as main heating-cooling device a heat pump and two complementary energy sources: a dc wind generator and a matrix of orientable amorph silicon photovoltaic panels. We also present a simplified mathematical model. The control of this system is demanding a full compatibility with the wireless web technologies as well as a strong prediction capability, able to cope with the high inertia of the heat pump. In the end we present the main elements of an fuzzy-interpolative expert system that is able to control this plant using mainly energetic passive control actions: greenhouse effect, shading, and ventilation.