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Authors
Abstract(s)
Os sistemas de climatização, ou sistemas de Aquecimento, Ventilação e Ar Condicionado
(AVAC) apresentam elevados valores de consumo energético a nível mundial, o que
representa preocupações crescentes em termos económicos e ambientais. Assim, a
necessidade de melhorar a eficiência energética dos sistemas de climatização obriga à
utilização de equipamentos de elevado desempenho e de mecanismos de controlo mais
sofisticados.
Na presente dissertação de mestrado, analisou-se e ensaiou-se uma Unidade de
Tratamento de Ar (UTA) com sistema de aquecimento/arrefecimento integrado, que é um
tipo de UTA de menores dimensões e que pode substituir os sistemas de climatização
mais complexos e de menor eficiência energética. Com vista a contribuir para a
exploração destes novos sistemas integrados, desenvolveu-se um algoritmo de controlo e
respetiva programação, para controlar o funcionamento da UTA através da respetiva
temperatura de insuflação.
Realizaram-se vários ensaios dos equipamentos, cujos resultados mostraram que se
consegue um bom desempenho da UTA quando controlada pelo algoritmo desenvolvido
e sua programação. Em particular concluiu-se que as condições pretendidas de
temperatura se alcançam com um menor trabalho dos ventiladores, com uma maior
abertura de válvula de expansão e com um maior trabalho do compressor. O consumo das
várias componentes da UTA pode ser minimizado através do seu controlo conjugado.
The Heating, Ventilation and Air Conditioning (HVAC) systems high values of energy consumption worldwide, represent growing concerns in economic and environmental terms. Therefore, the need to improve the energy efficiency of HVAC systems requires the use of high performance equipment and more sophisticated control techniques. In this dissertation, an Air Handling Unit (AHU) with an integrated heating/cooling system was analysed and tested; This is a smaller type of AHU which can replace the more complex air conditioning systems that have lower energy efficiency. In order to contribute to expand the use of these new integrated systems, a controlling algorithm and its programming have been developed to manage the operation of the AHU, essentially through the control of the temperature of supply air. Several tests of the equipment were carried out, whose results showed that an adequate performance of the AHU is obtained when it is controlled by the algorithm and the programming that has been developed. It has been found that the desired temperature conditions (setpoint) are achieved with less work of the fans, with larger opening of the expansion valve and with increased work of the compressor. The power consumption of the components of the AHU can be minimized when its control is combined.
The Heating, Ventilation and Air Conditioning (HVAC) systems high values of energy consumption worldwide, represent growing concerns in economic and environmental terms. Therefore, the need to improve the energy efficiency of HVAC systems requires the use of high performance equipment and more sophisticated control techniques. In this dissertation, an Air Handling Unit (AHU) with an integrated heating/cooling system was analysed and tested; This is a smaller type of AHU which can replace the more complex air conditioning systems that have lower energy efficiency. In order to contribute to expand the use of these new integrated systems, a controlling algorithm and its programming have been developed to manage the operation of the AHU, essentially through the control of the temperature of supply air. Several tests of the equipment were carried out, whose results showed that an adequate performance of the AHU is obtained when it is controlled by the algorithm and the programming that has been developed. It has been found that the desired temperature conditions (setpoint) are achieved with less work of the fans, with larger opening of the expansion valve and with increased work of the compressor. The power consumption of the components of the AHU can be minimized when its control is combined.
Description
Trabalho final de mestrado para obtenção do grau de Mestre em Engenharia Mecânica
Keywords
Sistemas de AVAC HVAC systems UTA AHU Sistemas de controlo Control systems Eficiência energética Energy efficiency
Citation
NUNES, João Tiago Coutinho - Controlo e monitorização de UTA com sistema de aquecimento/arrefecimento integrado. Lisboa: Instituto Superior de Engenharia de Lisboa, 2017. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa