Abstract

ARELLANO GARCIA, Marco Antonio et al. Microclimatic study in two subtypes of the Almeria greenhouse. Agric. Téc. Méx [online]. 2006, vol.32, n.2, pp.225-234. ISSN 0568-2517.

Currently the greenhouses of the Almería type must have a better control of their microclimate to satisfy the demands of produce quality imposed by the consumers. Nevertheless, before the introduction of better climate control technologies, it will be necessary to determine the microclimatic variations that occur inside of the greenhouse to obtain a rational control of the factors that affect the quality of the fruit. The objective was to evaluate the microclimate inside the greenhouse to define the variations in its interior and with base in these, implement the design and location of climate control technologies. The investigation was carried out from 2001 to 2003 in two subtypes of the Almería greenhouse: "Raspa y Amagado" and "Asymmetric", in the southern region of Spain. For their evaluation three sectors of the greenhouse were selected: 1) North, 2) Center and 3) South. Sensors of temperature, relative humidity and deficit vapor pressure were installed. The statistical analysis were carried out, by the hour, weekly, monthly, and the whole period of the study. The results indicated that the microclimate control strategy in the Raspa y Amagado type have to focus on the increase of temperature in the North sector during the winter season and, to diminish the energy load in the South sector during the spring-summer season. As for the Asymmetric type, a homogenous microclimate was found during the spring-summer season and, during the winter it will be necessary to implement modifications in the North sector of the structure. In this case, the control strategy should be centered in an improved design of the natural ventilation.

Keywords : Natural ventilation; temperature; vapor pressure deficit.

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