Experimental development of a hybrid solar/wind system for energy-saving management in a greenhouse
2008
Yasutake, D.(Kochi Univ., Nankoku (Japan). Faculty of Agriculture) | Miyauchi, K. | Kitano, M. | Yamane, S. | Yamamoto, Y. | Watanabe, A. | Yokoyama, K. | Hirai, M.
A hybrid solar/wind system for energy-saving management in a greenhouse was newly developed and installed in an agricultural field belonging to the Education and Research Center for Subtropical Field Science, Faculty of Agriculture, Kochi University. This system consists of two main parts: an underground water pipe system and a solar/wind generator system. The pipe system is used for controlling greenhouse air temperature through the exchange of sensible and latent heats between the greenhouse and the water-filled pipe. The solar/wind generation system is used for supplying electrical energy to the pipe system. The performance of the subsystems was assessed by measuring diurnal changes in the rates of heat exchange and generation of electrical energy. During the daytime, both the latent heat and sensible heat of the greenhouse air were stored in the water-filled pipe; during the nighttime, these heats were supplied to the greenhouse. Electrical energy was generated depending on solar radiation and wind speed. These capacities of heat exchange and electrical generation, however, were insufficient for energy-saving management in the greenhouse. From the assessment results, some problems affecting the performance of the system were identified and discussed.
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