Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/35035
Título: Impact of fine particle pollution on the natural ventilation potential of commercial buildings
Autor: Martins, Nuno Miguel Rocha, 1989-
Orientador: Graça, Guilherme Carvalho Canhoto Carrilho da
Palavras-chave: Teses de doutoramento - 2018
Data de Defesa: 2018
Resumo: The majority of office and other non-domestic buildings use mechanical cooling and ventilation, even when an optimized natural ventilation (NV) system could meet cooling and fresh air requirements. However, in most large cities, the outdoor environment is contaminated with a combination of noise, fine particles, heat and toxic gases. This contaminated environment has a detrimental impact on naturally ventilated buildings due to their lack of filtration and outdoor noise attenuation systems. This thesis presents a numerical analysis of the effect of fine particle pollution (PM2.5) on the NV potential of office buildings in California, Europe and Asia. Several years of measured weather and PM2.5 concentration data were used to perform statistical and dynamic thermal and airflow simulation analysis. In California and Europe, the outdoor temperature is suitable for NV during between 40 and 95 % of the annual working hours. In Asia, that fraction is lower, but can be increased by the availability of personal comfort systems (PCS). Nonetheless, in most cities, PM2.5 levels are high during a majority of those working hours. Detailed simulation results show that a hybrid NV system can reduce the air-conditioning and ventilation electricity consumption of a well-designed office building by up to 83 % (93 % if combined with PCS), in comparison to an office using, during all working hours, a mechanical cooling and ventilation system equipped with a high-efficiency particle filter. Unfortunately, in this hybrid approach, high levels of outdoor PM2.5 penetrate the indoor environment, increasing occupant cumulative exposure by up to six times. To overcome this problem, two exposure control approaches were tested. Using NV only during moments of low outdoor PM2.5 concentrations limits the exposure increase to up to three times but at the cost of reducing energy savings. Equipping NV openings with an electrostatic filter would result in a similar exposure reduction, but at a very low energy cost, taking full advantage of NV’s saving potential.
Descrição: Tese de doutoramento, Sistemas Sustentáveis de Energia, Universidade de Lisboa, Faculdade de Ciências, 2018
URI: http://hdl.handle.net/10451/35035
Designação: Doutoramento em Sistemas Sustentáveis de Energia
Aparece nas colecções:FC - Teses de Doutoramento

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