A Study of Single-Sided Ventilation and Provision of Balconies in the Context of High-Rise Residential Buildings

Mohamed, Mohd Farid; King, Steve; Behnia, Masud; Prasad, Deo

doi:10.3384/ecp110571954

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…It is specified in studies that the wind pressure on buildings is by influenced by different appurtenances like balconies or the rippling of building surfaces and the balconies are more effective than uniform rippling on decreasing the pressure on buildings (Aida & Gotoh, 1982). Furthermore, in the condition that the unilateral ventilation strategy is the only choice, the effects of the ventilation function can be improved by the bulging elements of façade like balconies (Mohamed, King, Behnia, & Prasad, 2011).…”

Section: Urban Bodiesmentioning

confidence: 99%

“…Because of the reduction in wind discomfort in balconies, different conditions like enclosure of balcony or adding partitions can be considered (Hedquist et al, 2009). We can see that in today's urban environment, the vertical growth of buildings, especially the dense residential buildings, accompanied by using natural light and natural ventilation for indoor environment quality can be an appropriate solution if it is planned and managed well (Mohamed, King, Behnia, & Prasad, 2011).…”

Section: Figure 1: Schematic Presentation Of Building Forms Exposed To Wind Disturbance On Pedestrian Levelmentioning

confidence: 99%

See 1 more Smart Citation

The Study of Pilotis and Reentrant BuildingsEffects on Kinetic Energy and Wind Velocity in Urban Canyons

Mirabi¹,

abdi²

2018

Proceedings of the 5th International Conference on Civil Engineering, Architecture and Urban Planning Elites

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The form of urban canyons has so many effects on climate and ventilation of urban canyons. Most of the buildings in urban area have pilotis or balcony (reentrant), and a few of them are rigid and have even surfaces. For this reason, the pilotis form, the reentrant form and the mixed form (pilotis and reentrant) have been modeled in this article with ENVI-met software. In this article, the effects of structural forms on wind velocity and kinetic energy at 1 meter above ground level (pedestrian level) has been studied using ENVI-met software. Due to the difference of these alterations in north, south and center of urban canyon, each of them has been studied separately. According to these studies, it can be observed that the pilotis form increases the kinetic energy and wind velocity. In model 1 the kinetic energy in the south of urban canyon increases up to 7.65 M 2 /M 3 . The reentrant form decreases the kinetic energy and wind velocity in most regions of the urban canyon. The combination of reentrant form and pilotisis creates an average mode. Considering the results of the study, it can be said that the form of urban canyons must be selected due to the climate of that region.

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Section: Urban Bodiesmentioning

confidence: 99%

Section: Figure 1: Schematic Presentation Of Building Forms Exposed To Wind Disturbance On Pedestrian Levelmentioning

confidence: 99%

The Study of Pilotis and Reentrant BuildingsEffects on Kinetic Energy and Wind Velocity in Urban Canyons

Mirabi¹,

abdi²

2018

Proceedings of the 5th International Conference on Civil Engineering, Architecture and Urban Planning Elites

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“…Through changing ventilation process, balcony can help habitants with providing better thermal comfort conditions (Omrani et al 2015;Omrani et al 2017). specially in high-rise buildings (Mohamed et al 2011). Although balcony can be deemed as an important determining factor to change natural ventilation, most research has studied buildings with simple geometry and flat facades (Lukiantchuki et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Balcony Types on the Naturally-Ventilated Buildings

Mirabi

Nasrollahi

Dadkhah

2020

sace

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Natural ventilation is application of natural drift power of wind. Wind can enter and exit buildings through the openings on facades. Hence, Form of facades can impact the air flow behaviour and consequently natural ventilation because they can change the pressure distribution on facades. Moreover, wind pressure difference between windward and leeward facades of buildings is the most important factor affecting natural ventilation. So, it is worthy to focus on facade details in order to enhance natural ventilation. Particularly, geometrical details of facades such as protrusions and indentations e.g. balconies can be considered effective elements on average pressure distribution on both windward and leeward facades, changing pressure difference between these facades. This difference can drive the air flow towards interior spaces significantly. Although this basic rule has been used by different researchers in order to increase natural ventilation buildings, the most research has been studied buildings with flat facades. Therefore, this study aims to investigate effects of balcony types on the natural ventilation. Three types of balcony are simulated and the wind pressure distribution on the windward and leeward facades are analysed. All these simulations are carried out for normally (perpendicular) and obliquely incident wind. This study is performed with Ansys Fluent 18 for all simulations. The results showed that balcony types can affect the pressure distribution on the windward and leeward facades of buildings, leading to the more or less pressure difference between these two facades. These results show that protrusion (protrusive balcony) can cause more complicated pattern of the wind pressure on facades than the others. Also, Re-entrant balcony causes the more pressure differences between the windward and leeward facades and enhances natural ventilation of buildings more considerably than the protrusive one.

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“…The outdoor air driven into buildings can significantly alleviate odours and improve indoor thermal comfort. Natural ventilation is often designed as single-sided or cross-flow [3]. The single-sided natural ventilation system has one or more openings at only one façade of a closed room or building [3], whereas the cross-flow (or cross) natural ventilation has two or more openings that are on two or more facades [4].…”

Section: List Of Tablesmentioning

confidence: 99%

“…Natural ventilation is often designed as single-sided or cross-flow [3]. The single-sided natural ventilation system has one or more openings at only one façade of a closed room or building [3], whereas the cross-flow (or cross) natural ventilation has two or more openings that are on two or more facades [4]. Both single-sided and cross natural ventilation can be delivered through manually operable windows or automated windows.…”

Section: List Of Tablesmentioning

confidence: 99%

Development of an Occupant-centric Control Algorithm for Mixed-Mode Ventilation Buildings to Regulate Window Operations

Liu¹

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Mixed-mode ventilation is a design feature to improve building energy efficiency and indoor air quality by combining natural ventilation and mechanical ventilation. Mixed-mode ventilation commercial buildings are often equipped with variable air volume (VAV) terminal device and air handling unit (AHU) as the mechanical ventilation system and operable windows to deliver natural ventilation. However, in practice, mixed-mode ventilation buildings do not always achieve better performance than mechanically ventilated buildings, largely due to inappropriate window operations. Therefore, the sequences of operation for terminal devices serving zones with operable windows should be designed in recognition of these risks, which in turn should be informed by research investigating occupants' window and thermostat use behaviour. This research examines window and thermostat use data collected from two mixed-mode ventilation buildings in Ottawa, Canada.Discrete-time Markov logistic regression models and decision tree models were established to predict the likelihood of thermostat keypress and window opening/closing instances and identify the indoor conditions that trigger these actions. Based on this analysis, a set of control algorithms are developed to improve terminal device sequencing in mixed-mode ventilation buildings in cold climates such that the comfort and energy savings potential of operable windows can be fully realized. The control algorithm applies a thermostat setpoint setback to encourage occupants to open windows when conditions are advantageous for saving energy, and discourage occupants from opening windows when energy penalties may be caused. The control algorithms are tested by using building performance simulation (BPS), and 3-16% of energy reductions could be achieved when control sequences encouraged occupants to undertake energy-efficient window use behaviours compared to an ii identical buildings with unregulated window operations. It is also found that the unregulated window operations could increase the heating load up to 21% and cooling load by 22% relative to identical buildings with fixed windows in a cold climate. These findings suggest that control algorithms should be designed properly in mixed-mode ventilation buildings to realize its full energy-saving potential and avoid adverse energy impacts caused by unregulated window operations.iii PrefaceThis integrated thesis consists of two journal papers, either published or under review.Should readers wish to refer to materials from this thesis, the current thesis is required to be cited. The articles included in this thesis are as follow:• Article 1 : W. Liu, H. B. Gunay, M. M. Ouf. Modelling window and thermostat use behaviour to inform sequences of operation in mixed-mode ventilation buildings.

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A Study of Single-Sided Ventilation and Provision of Balconies in the Context of High-Rise Residential Buildings

Cited by 7 publications

References 8 publications

The Study of Pilotis and Reentrant BuildingsEffects on Kinetic Energy and Wind Velocity in Urban Canyons

The Study of Pilotis and Reentrant BuildingsEffects on Kinetic Energy and Wind Velocity in Urban Canyons

Investigating the Effect of Balcony Types on the Naturally-Ventilated Buildings

Development of an Occupant-centric Control Algorithm for Mixed-Mode Ventilation Buildings to Regulate Window Operations

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