Percorrer por autor "Couto, C."
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- Dynamic temperature models of a soiless greenhousePublication . Cunha, J. B.; Ruano, Antonio; Faria, E. A.; Couto, C.In this paper climate discrete-time dynamic models for the inside air temperature of a soilless greenhouse are identified, using data acquired during two different periods of the year. These models employ data from air temperature and relative humidity.
- Greenhouse climate management and control systemsPublication . Cunha, J. B.; Ruano, Antonio; Oliveira, P. B.; Couto, C.The technologies used in greenhouse production systems have developed considerably during the last decade. These improvements have taken place in several areas, such as the development of new building techniques and actuating equipments, modelling of the plant physiological processes and of the greenhouse climate, among many others. Nowadays, due to economic and environmental requirements, there is still a demand to improve the greenhouse climate management and control systems in order to optimise the production process. This paper addresses some of the software tools that are being implemented and tested with this purpose.
- A greenhouse climate multivariable predictive controllerPublication . Cunha, J. B.; Couto, C.; Ruano, AntonioA multivariable predictive controller was implemented to regulate the air temperature, humidity and CO2 concentration for a greenhouse located in the north of Portugal. The controller outputs are computed in order to optimise the future behaviour of the greenhouse environment, concerning the set-point accuracy and the minimization of energy inputs.
- Identification of greenhouse climate dynamic modelsPublication . Cunha, J. B.; Ruano, Antonio; Couto, C.In this paper climate discrete-time dynamic models for the inside air temperature of two different greenhouses are identified, using data acquired during two different periods of the year. These models employ data from air temperature and relative humidity (both outside and inside the greenhouse), solar radiation, wind speed, and control inputs (ventialtion, etc.).
- Modelos e estratégias de controlo ambientais para estufas agrícolasPublication . Cunha, J. B.; Couto, C.; Ruano, AntonioFor a greenhouse with a double polyethylene cover, it will be presented a dynamic climate transfer function and an adaptive controller for the air temperature. The model employ data acquired from the outside weather and from the heating and cooling inputs.
- Real-time parameter estimation of dynamic temperature and humidity models for greenhouse adaptive climate controlPublication . Cunha, J. B.; Couto, C.; Ruano, AntonioA real-time parameter estimator for the climate discrete-time dynamic models of a greenhouse located at the North of Portugal are presented. The experiments showed that the second order models identified for the air temperature and humidity achieve a close agreement between simulated and experimantal data.
- Real-time parameter estimation of dynamic temperature models for greenhouse environmental controlPublication . Cunha, J. B.; Couto, C.; Ruano, AntonioFor a greenhouse located at UTAD-University, the methods used to estimate (in real-time) the parameters of the inside air temperature model will be described. The structure and the parameters of the climate discrete-time dynamic model were previously identified using data acquired during two different periods of the year. Several experiments showed that the second-order models identified achieve a close agreement between simulated and experimental data. Later, it was found that parameters change with varying operational conditions. Thus, for an efficient use of these models in real-time control, a recu~ive identification technique was implemented for the estimation of the parameters.
- Real-time parameter estimation of dynamic temperature models for greenhouse environmental controlPublication . Cunha, J. B.; Couto, C.; Ruano, AntonioFor a greenhouse located at UTAD-University, the methods used to estimate in real-time the parameters of the inside air temperature model will be described. The structure and the parameters of the climate discrete-time dynamic model were previously identified using data acquired during two different periods of the year.
- Tecnologias da informação e electrónica aplicadas às estufas agrícolasPublication . Cunha, J. B.; Couto, C.; Ruano, AntonioAo longo dos últimos anos tem-se verificado uma tendência para a intencificação da produção, redução dos custos e melhoria na gestão dos processos produtivos. A complexidade dos fsctores implicados na obtenção destes objectivos torna indispensável, para poder gerir todo o sistema, que se recorra a um bom suporte informático, tanto em hardware como em software.