The world population has been increasing rapidly over the past decades, resulting in higher energy demand, consumption, and an increase in greenhouse gas emissions. Climate change will have disastrous effects in the future on natural and human systems; various studies have investigated the future of climate change, presenting different predictive scenarios. In this research, scenarios drawn by the Fifth Assessment Report (AR5) of The Intergovernmental Panel on Climate Change (IPCC) were used to define the potential of passive cooling techniques to enhance thermal comfort and reduce the energy consumption of an office building in Milan by implementing different window opening degrees and profiles, as well as different shading devices, namely louvers and overhangs. Finally, a modification of the as-is window-to-wall ratio. The simulations are tested on the current and future climate, divided into two main RCPs; RCP 4.5 and RCP 8.5. Each has three ranges; The first range is between (2026–2045), the second range (2056-2075), and finally, the third range (2080–2099). The simulations are divided into two main categories according to each climate: the Passive solutions and the optimum passive solution integration with the active system. The passive solutions were evaluated based on the Cooling hours and Comfort index, while the integration of both was evaluated according to the sensible cooling load. Each indicator was computed according to the office working hours to ensure the maximum accuracy of the results. The final results show a significant reduction of cooling sensible loads as the passive techniques provide tremendous comfort hours due to the nighttime ventilation in parallel with minor solar gains during the day as a result of the implementation of shading devices.
La popolazione mondiale è aumentata rapidamente negli ultimi decenni, con conseguente aumento della domanda di energia, del consumo energetico e di un aumento delle emissioni di gas serra. Il cambiamento climatico avrà effetti disastrosi in futuro sui sistemi naturali e umani; vari studi hanno indagato il futuro del cambiamento climatico, presentando diversi scenari predittivi. In questa ricerca, gli scenari tracciati dal Quinto Rapporto di Valutazione (AR5) dell'Intergovernmental Panel on Climate Change (IPCC) sono stati utilizzati per definire il potenziale delle tecniche di raffreddamento passivo per migliorare il comfort termico e ridurre il consumo energetico di un edificio per uffici a Milano, implementando diversi gradi e profili di apertura delle finestre, nonché diversi dispositivi di ombreggiatura, vale a dire lamelle-frangisole e sporgenze. Infine, è stata apportata una modifica del rapporto finestra-parete. Le simulazioni sono testate sul clima attuale e futuro, suddivise in due RCP principali; RCP 4.5 e RCP 8.5. Ognuno ha tre gamme; Il primo intervallo è compreso tra (2026-2045), il secondo intervallo (2056-2075) e, infine, il terzo intervallo (2080-2099). Le simulazioni sono suddivise in due categorie principali in base a ciascun clima: le soluzioni passive e l'integrazione ottimale della soluzione passiva con il sistema attivo. Le soluzioni passive sono state valutate in base all'indice di ore di raffreddamento e comfort, mentre l'integrazione di entrambe è stata valutata in base al carico di raffreddamento sensibile. Ogni indicatore è stato calcolato in base all'orario di lavoro dell'ufficio per garantire la massima accuratezza dei risultati. I risultati finali mostrano una significativa riduzione dei carichi sensibili di raffreddamento in quanto le tecniche passive forniscono enormi ore di comfort grazie alla ventilazione notturna in parallelo con piccoli guadagni solari durante il giorno a seguito dell'implementazione di dispositivi di ombreggiamento.
Impacts of climate change on building energy performance : analysis of future scenarios for an office building in Milan
Othman, Abdelhamid Mohamed Abdelhamid;MATAROZZO, AGOSTINO
2021/2022
Abstract
The world population has been increasing rapidly over the past decades, resulting in higher energy demand, consumption, and an increase in greenhouse gas emissions. Climate change will have disastrous effects in the future on natural and human systems; various studies have investigated the future of climate change, presenting different predictive scenarios. In this research, scenarios drawn by the Fifth Assessment Report (AR5) of The Intergovernmental Panel on Climate Change (IPCC) were used to define the potential of passive cooling techniques to enhance thermal comfort and reduce the energy consumption of an office building in Milan by implementing different window opening degrees and profiles, as well as different shading devices, namely louvers and overhangs. Finally, a modification of the as-is window-to-wall ratio. The simulations are tested on the current and future climate, divided into two main RCPs; RCP 4.5 and RCP 8.5. Each has three ranges; The first range is between (2026–2045), the second range (2056-2075), and finally, the third range (2080–2099). The simulations are divided into two main categories according to each climate: the Passive solutions and the optimum passive solution integration with the active system. The passive solutions were evaluated based on the Cooling hours and Comfort index, while the integration of both was evaluated according to the sensible cooling load. Each indicator was computed according to the office working hours to ensure the maximum accuracy of the results. The final results show a significant reduction of cooling sensible loads as the passive techniques provide tremendous comfort hours due to the nighttime ventilation in parallel with minor solar gains during the day as a result of the implementation of shading devices.| File | Dimensione | Formato | |
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https://hdl.handle.net/10589/191781