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Em alguns países, em que as temperaturas durante os meses de Verão são bastante elevadas, são necessários sistemas de climatização nas estufas agrícolas para que a produção de determinadas culturas não seja prejudicada. Com o aquecimento global, as temperaturas estão subir ano após ano e em determinados países a utilização de sistemas de ventilação forçada para o arrefecimento das estufas torna-se insuficiente. A elaboração desta dissertação surgiu com a necessidade de implementar um sistema de arrefecimento de estufas agrícolas alternativo que consiga alcançar as temperaturas ideais de desenvolvimento
das culturas e que resulte em benefícios ambientais. Assim, esta dissertação pretende
realizar a simulação energética e o estudo de viabilidade da implementação de um sistema de trigeração, constituído por um sistema de microcogeração a funcionar em conjunto com um chiller de absorção, acrescido de uma bomba de calor a funcionar como complemento.
Foram realizadas várias simulações energéticas através do software EnergyPlus, que permitiram fazer uma análise pormenorizada do efeito da radiação solar na estufa e das necessidades de arrefecimento. Permitiu também dimensionar o sistema de trigeração necessário e a comparação deste com um sistema constituído apenas por uma bomba de calor.
No final foi realizada a respectiva confrontação de resultados entre ambos os sistemas de forma a determinar a viabilidade da implementação do sistema de trigeração numa estufa.
In several countries, where temperatures during summer are quite high, air-conditioning systems are needed in greenhouses for the production of certain crops. With global warming, temperatures are rising year after year and the use of forced ventilation systems for cooling greenhouses became insufficient in some countries. This thesis arose from the need to implement an alternative system for cooling greenhouses capable of reaching the ideal temperatures for crop growth and resulting in environmental benefits. Thus, it is intend to perform energy simulations and the feasibility study of a trigeneration system implementation, consisting of a micro-CHP operating together with an absorption chiller and a heat pump working as a complement. Several energy simulations were performed using the software EnergyPlus, which allows a thorough analysis of the effect of solar radiation in greenhouses and its cooling needs. It also allowed to scale the trigeneration system and compare it with a system consisting of a heat pump. Finally the results of the two systems were compared in order to determine the feasibility of the trigeneration system in a greenhouse.
In several countries, where temperatures during summer are quite high, air-conditioning systems are needed in greenhouses for the production of certain crops. With global warming, temperatures are rising year after year and the use of forced ventilation systems for cooling greenhouses became insufficient in some countries. This thesis arose from the need to implement an alternative system for cooling greenhouses capable of reaching the ideal temperatures for crop growth and resulting in environmental benefits. Thus, it is intend to perform energy simulations and the feasibility study of a trigeneration system implementation, consisting of a micro-CHP operating together with an absorption chiller and a heat pump working as a complement. Several energy simulations were performed using the software EnergyPlus, which allows a thorough analysis of the effect of solar radiation in greenhouses and its cooling needs. It also allowed to scale the trigeneration system and compare it with a system consisting of a heat pump. Finally the results of the two systems were compared in order to determine the feasibility of the trigeneration system in a greenhouse.
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Universidade da Beira Interior