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CONSUMO DE ENERGIA E CUSTOS DE AQUECIMENTO NA PRODUÇÃO DE FLORES E LEGUMES EM E...

Meneses, Jorge F.; Baptista, Fátima J.

Pretende-se determinar os consumos de energia e os custos em aquecimento, na produção de flores e de vegetais, ao longo do ano, em estufas de plástico aquecidas, localizadas em diversas zonas de produção de culturas forçadas. No primeiro ano considerou-se Portugal e a produção de rosa. Foram calculados os consumos energéticos e os custos de aquecimento com gasóleo ou gás natural, para duas combinações de temper...


Monitorização e controlo do ambiente numa sala de cabritos com ventilação forçada

Pederneira, Ana Maria; Pascoal, Rita Aurea; Meneses, Jorge Ferro

Although goats are not, in most cases, associated with intensive production, this practice has been increasingly common. With the intensification of production it has become important to develop a controlled environment to optimize resources and reduce costs. The objective of this study was to monitor and control air quality inside a room for artificial feeding of goat kids. We studied the temperature, humidity...

Data: 2011   |   Origem: Repositório da UTL

Greenhouses climate modelling. Tests, adaptation and validation of a dynamic cl...

Baptista, Fátima; Bailey, Bernard; Meneses, Jorge; Navas, Luís

Most greenhouse climate models are specific for a particular combination of greenhouse type, crop, region and weather conditions. Models are formulated and validated for those conditions and it is not easy to directly extrapolate them to other, different conditions. In order to use them the coefficients need to be calibrated by experimental work, followed by validation of the adapted model. The main purpose of ...


Statistical modelling of the microclimate in a naturally ventilated greenhouse

Litago, Javier; Baptista, Fátima; Meneses, Jorge; Navas, Luís; Bailey, Bernard; Sánchez-Girón, Victor

The time-series models introduced in this paper were developed to estimate and forecast temperature and humidity dynamics in an unheated, naturally ventilated greenhouse in Lisbon, Portugal. External and internal climatic data recorded over four consecutive months during the tomato (Lycopersicon esculentum, Mill) growing season were used to build and validate forecasting models for simulating environmental cond...


Greenhouse ventilation rate: theory and measurement with tracer gas techniques

Baptista, Fátima; Bailey, Bernard; Randall, John; Meneses, Jorge

Leakage and ventilation rates were measured in a four span glasshouse at Silsoe Research Institute. Two tracer gas techniques were used, a decay rate method with different positions of the leeward ventilator (0, 10 and 20% of the maximum opening) and a continuous injection method with the leeward ventilators open 10%. The influences of wind speed, wind direction and temperature difference between inside and out...


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    Financiadores do RCAAP

Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia