RESUMOCasas de vegetação com ventilação natural são muito utilizadas em países tropicais e pouco se sabe como este tipo de estrutura afeta a variabilidade espacial da umidade relativa do ar. O objetivo deste trabalho foi medir e verificar a variabilidade espacial da umidade relativa do ar no interior de uma casa de vegetação com ventilação natural. Para a medição da umidade relativa do ar foi utilizado um termo-higrômetro e amostrados 114 pontos dentro da casa de vegetação, nos horários das 9, 12 e 16 h e nas alturas de 0,3; 1,2 e 2,0 m. Os dados adquiridos foram processados pelo software geoestatístico GS+ e para gerar mapas de visualização para cada horário e altura, utilizou-se o software Surfer 10.3.705. Os resultados demostraram que ocorreram variações na distribuição espacial da umidade relativa do ar no interior da casa de vegetação com ventilação natural. Palavras-chave: agroclimatologia, casa de vegetação, geoestatística Spatial variability of relative humidity inside tropical greenhouse ABSTRACTGreenhouse with natural ventilation is widely used in tropical countries, and little knowledge is available about how this type of structure affects the spatial variability of agroclimatic variables. The aim of this study was to analyse the spatial variability of relative humidity inside a greenhouse with natural ventilation. The measurement of relative humidity was done at 114 points inside the greenhouse at 9, 12 and 16 hours and on heights of 0.3, 1.2 and 2.0 m. The acquired data were processed by the geostatistical software GS+ and maps were generated and displayed for each time and height using the Surfer 10.3.705 software. The results showed that there were variations in the spatial distribution of relative humidity inside the greenhouse.

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This work presents a simple analogue waterproof temperature probe design and its electronic interfacing with a computer to compose a data acquisition system for water temperature measurement. It also demonstrates the system usage through an experiment to verify the water heating period with an electric heater and another to verify the Newton's law of cooling iopscience.org/ped