Evaluation of fog and handling curtains to reduce air tempertaure in a plastic greenhouse. / Avaliação da nebulização e abertura de cortinas na redução da temperatura do ar em ambiente protegido.

AUTOR(ES)

Raquel Aparecida Furlan

DATA DE PUBLICAÇÃO

2001

RESUMO

The objective of this study was to evaluate different managements, such as fog and handling curtains, to reduce air temperature in a plastic greenhouse. The experiment was conducted in two plastic greenhouses installed in an East-West direction and located at the Department of Rural Engineering, "Escola Superior de Agricultura Luiz de Queiroz", University of São Paulo, Piracicaba, São Paulo State. The plastic greenhouses have a dimension of 6.4m width and 17.5m of length. The air temperature (°C) spatial distribution was measured using 78 thermopar sensors installed in a grid of 3.0m horizontally and five different high, 0.5, 1.0, 2.0, 3.0 and 4.0m. The sensors were connected to a data logger system and the data were stored there. The fog system showed a good efficiency to decrease the greenhouse air temperature. A combination of fog system and handling curtains was the most efficient management to decrease the plastic greenhouse air temperature. Due to the convection process, the opened of zenith curtains showed efficient to decrease the plastic greenhouse temperature only when the side curtains is not totally opened. The air temperature distribution was not modified when the side curtains were opened from 3.0m of the soil and the wind speed outside was higher than 2.0 m/s. Isotherms lines were determined and described the spatial distribution of plastic greenhouse air temperature. Through the isotherms lines were observed that the spatial distribution of plastic greenhouse air temperature was not homogeneous. Due to this fact, the places to install the sensors are an important factor to be considered. In this study, the sensor that showed the average value of greenhouse air temperature was located in the middle of the plastic greenhouse, and 1.0m of high.

ASSUNTO(S)

cultivo protegido reduction estufa greenhouse redução effect of temperature efeito de temperatura temperature of air nebulização nebulization protected culture temperatura do ar

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