Influence of the urban environment on the effectiveness of natural night-ventilation of an office building

Ramponi, R Rubina; Gaetani, II Isabella; Angelotti, Adriana

doi:10.1016/j.enbuild.2014.04.001

Cited by 48 publications

(18 citation statements)

References 21 publications

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“…Only 0.6% of the overall cooling energy consumption was reduced in the reference timeframe in Hong Kong. This finding is in line with the results of previous studies [36,37]. Existing studies have revealed that the effectiveness of nighttime ventilation is highly dependent on outside weather conditions, and that the cooling potential of nighttime ventilation lessens with an increase in outdoor temperatures.…”

Section: Discussionsupporting

confidence: 83%

Cooling Energy Implications of Occupant Factor in Buildings under Climate Change

Lim

Yun

2017

Sustainability

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Occupant factor is a critical element in the overall energy consumption of buildings. This study aims to reveal how occupant factors influence the energy consumption of example buildings in Seoul, Tokyo, and Hong Kong under climate change projections, and to prioritize factors with energy saving potential for buildings in consideration of future climate change. The study finds that the cooling degree-hours base of 23.3 • C in the three cities sharply increases with future climate change by analyzing future hourly weather data produced herein. Simulations are made with EnergyPlus Runtime Language (Erl) for modeling occupant behavior. The simulation results reveal that a dynamic thermostat control based on an adaptive comfort model is an effective method to reduce cooling energy consumption under future climate change, reducing cooling energy consumption by up to 18% in some instances. In particular, we reveal that a combined application of the adaptive comfort control, nighttime ventilation, and the use of occupancy-based lighting and equipment result in reducing cooling energy consumption by 28%. The outcomes of this study are potentially useful in providing cost-effective solutions to adapt buildings for future climate change with simple modifications to occupant behavior. Also, the roles of renewable energy are briefly discussed.

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Section: Discussionsupporting

confidence: 83%

Cooling Energy Implications of Occupant Factor in Buildings under Climate Change

Lim

Yun

2017

Sustainability

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“…Moreover, the importance of the UHI mitigation strategies in the reduction of these energy demands is widely studied (Magli et al, 2014). These works conclude that the influence of the surrounding built area is a crucial factor in building energy calculation (Pigeon et al, 2014;Ramponi, Gaetani, & Angelotti, 2014).…”

Section: Building Energy Savingmentioning

confidence: 98%

Recent challenges in modeling of urban heat island

Mirzaei

2015

Sustainable Cities and Society

346

125

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Article history: Available online xxx Keywords: Urban heat island Modeling CFD Remote sensing Meso-scale Urban canopy model Q3 a b s t r a c tThe elevated air temperature of a city, urban heat island (UHI), increases the heat and pollution-related mortality, reduces the habitats' comfort and elevates the mean and peak energy demand of buildings. To countermeasure this unwanted phenomenon, a series of strategies and policies have been proposed and adapted to the cities. Various types of models are developed to evaluate the effectiveness of such strategies in addition to predict the UHI. This paper explains the compatibility of each type of model suitable for various objectives and scales of UHI studies. The recent studies, mainly from 2013 to 2015, are further categorized and summarized in accordance with their context of study.

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“…As such it is representative of many of the multi-storey RMG building stock of Bangladesh (Naz 2008;Fatemi 2014, Authors 2014 Where case study building 3 departs from the norm is in relation to its immediate surrounding structures which are all one-storied, whereas those of other two selected case study buildings are one to six stories tall. As all of its production areas are located above ground level, the wind shielding offered by adjacent buildings can be ignored (Ramponi, Gaetani and Angelotti 2014). As a result, the findings from this simulation study will not be fully applicable to other RMG factories with different plans, orientations and internal fan layouts.…”

Section: Building Selection For Simulation Studymentioning

confidence: 82%

Effect of changing window type and ventilation strategy on indoor thermal environment of existing garment factories in Bangladesh

Hossain

Lau

Wilson

et al. 2017

Architectural Science Review

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This paper presents two workable solutions that can significantly improve the indoor thermal environment within the workspaces in existing ready-made garment (RMG) factories in the tropical climatic context of Bangladesh. The research involved field studies in three multi-storey factory buildings, semistructured interviews with workers and owners and simulation studies. Field data indicated that the effective window-opening size of existing buildings and limiting the ventilation strategy to occupied hours caused overheating of the indoor environment. Among a list of proposals, the building owners saw value in implementing two solutions (i.e. altering existing window type to one with a higher effective opening area and adopting a night-time ventilation strategy) in their existing buildings as well as proposed new buildings. To quantify the benefits of these two interventions, a validated simulation study on one of the buildings was conducted. The findings confirm that these two solutions can provide reductions of up to 23% in overheated hours during operational time and in so doing, improve workers' thermal comfort and well-being. IntroductionIn the tropical climatic context of Bangladesh, most of the workers in ready-made garment (RMG) factories suffer from discomfort in their workspaces and a range of health problems due to the high indoor air temperature and poor air distribution (Authors 2015; Authors 2014;Fatemi 2014). The workspaces include cutting, sewing and finishing sections. Workers' thermal discomfort also hampers productivity (Fatemi 2014), resulting in additional workload to meet production targets without any financial benefit. These workspaces, with a deep floor-plan and low ceiling heights, usually employ forced cross-ventilation using auxiliary extractor fans located on the external walls. However, the existing active ventilation strategies do not meet the thermal comfort needs of the workers with significant overheating observed in the middle part of the floor plate (Authors 2015) even in the presence a significant difference in 'wind pressure coefficient' between the inlet and outlet openings (CIBSE 2005) due to mechanical ventilation.Previous theoretical studies and empirical evidence suggest that improving the indoor thermal environment and air quality through the adaptation of available passive technologies can improve health, productivity and wellbeing of the workers in workspace offering financial benefits to both workers and factory owners (Fisk 2000;Hobday and Dancer 2013;Mahbob et al. 2011;Srinavin and Mohamed 2003). In particular, improving the thermal environment of RMG factories helps to reduce production errors up to 1.88% (Fatemi 2014), which may offer added commercial benefit to factory owners and their international buyers. In addition, effective implementation of natural ventilation in the factories can provide a natural environment for the workers and reduce electricity energy consumption and consequent greenhouse gas emissions (Wijewardane and Jayasinghe 2008). By adopting ...

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Influence of the urban environment on the effectiveness of natural night-ventilation of an office building

Cited by 48 publications

References 21 publications

Cooling Energy Implications of Occupant Factor in Buildings under Climate Change

Cooling Energy Implications of Occupant Factor in Buildings under Climate Change

Recent challenges in modeling of urban heat island

Effect of changing window type and ventilation strategy on indoor thermal environment of existing garment factories in Bangladesh

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