Investigating the energy saving potential of applying shading panels on opaque façades: A case study for residential buildings in Hong Kong

Liu, Sheng; Kwok, Yu Ting; Lau, Kevin Ka-Lun; Chan, Pak Wai; Ng, Edward

doi:10.1016/j.enbuild.2019.03.044

Cited by 68 publications

(27 citation statements)

References 37 publications

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“…The construction industry is mainly focused on different actions to promote innovative and sustainable solutions in new and existing buildings, emphasizing the building envelope [22][23][24], mainly the façades, which play a substantial role in the energy saving of the buildings [25][26][27][28][29]. Along this line, Halawa et al [30] presented a review addressing different options to optimize the performance of building façades in hot and humid climates, drawing attention to innovative solutions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

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Commercial and residential building is one of the four major final energy consumption and end-use sectors. In this sector, cooling loads represent an important part of the energy consumption, and therefore, they must be minimized, improving the energy efficiency of buildings. Ventilated façades are one of the most widely used passive elements that are integrated into buildings, precisely with the aim of reducing these loads. This reduction is due to the airflow induced in the air cavity by the buoyancy forces, when the solar radiation heats the outer layer of the façade. In the open joint ventilated facades (OJVF), ventilation is attained through the open joints between the panels composing the outer layer. Despite the steadily growing research in the characterization of this type of system, few studies combine the numerical modelling of OJVF with experimental results for the assessment of the airflow in the ventilated cavities. This paper experimentally validates a numerical simulation model of an OJVF. Firstly, the façade performance has been experimentally assessed in a laboratory model determining the temperatures in the panels and air gap and measuring the flow field at the gap using particle image velocimetry (PIV) techniques. Secondly, a numerical model has been developed using advanced Computational Fluid Dynamics (CFD) simulation tools. Finally, an experimental validation of the numerical model has been done. Experimental and numerical results are compared in different planes inside the ventilated cavity. The discrete ordinates (DO) radiation model and the k-ε renormalisation group (RNG) turbulence model better adjust the simulated results to the experimental ones.

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Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

et al. 2019

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“…But the type of glass and the weather parameters cannot be ignored. S. Liu et al [119] suggested using shading devices on the opaque facades of public rental housing in Hong Kong. Different configurations such as the length, number, and tilt angle of the light shielding plate were discussed, and the maximum interference with energy efficiency was achieved.…”

Section: Shading Systemsmentioning

confidence: 99%

A Review of Performance-Oriented Architectural Design and Optimization in the Context of Sustainability: Dividends and Challenges

Liu

Peng

2020

Sustainability

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As most countries have widespread and growing concerns about the sustainable development of society, the requirement to continuously reduce energy consumption poses challenges for the architecture, engineering and construction (AEC) industry. Performance-oriented architectural design and optimization, as a novel design philosophy and comprehensive evolution technology, has been accepted by architects, engineers, and stakeholders for a period of time. Performance in the context of architecture is a widely discussed definition that has long shown a correlation with visual and cultural attributes. Shifting the paradigm of sustainable development while ensuring that the function and aesthetics of the building are not overlooked has been the focus of public attention. Considering the core design elements that affect energy conservation and style performance, the design and optimization of building envelopes, form, and shading systems were selected as research materials. From the perspective of epistemology and methodology, a systematic review of 99 papers was conducted to promulgate the latest development status of energy-efficiency design. This paper manifests a detailed analysis of the design patterns, research features, optimization objectives, and techniques of current approaches. The review found that performance-oriented design optimization can benefit the entire industry from the heuristic knowledge base and the expansion of the design space while maintaining sustainability. In contrast, challenges such as tools, skills, collaboration frameworks, and calibration models are highlighted.

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“…The base case is a 20-story Hong Kong residential block built over 20 years ago. It is southeast oriented, as that is the popular direction for ordinary residential buildings in China due to geographic location and its energy saving potential [58]. The shape of the building maximizes the number of flats on each floor to make good use of the limited amount of land available.…”

Section: The Buildingmentioning

confidence: 99%

Energy-Efficient Window Retrofit for High-Rise Residential Buildings in Different Climatic Zones of China

Hossain

et al. 2019

Sustainability

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The building envelope plays a significant role in the energy performance of buildings and windows are a key element in transmitting heating and cooling between the indoor and outdoor environment, and hence an adequate window system is one of the most important retrofit strategies of existing buildings for energy conservation. Therefore, this study presents a method with a theoretical case study to examine the improvement of energy efficiency in a typical high-rise residential building through window retrofitting. A building energy design model in Designbuilder along with a building information modeling (BIM) model in Revit are developed, with 20 common potential glazing alternatives being analyzed to predict the potential energy savings in the same case building with identical orientation located in a variety of climate zones in China. Based on different parameters and considerations, the results demonstrated that the currently relatively expensive low-e window glazing has the best energy performance in all climate zones, but is sufficiently close to conventionally glazed windows in its energy efficiency to discourage its adoption at present, and that, instead, a single dark conventional glazed window is preferred in a hot summer/warm winter climate, double dark traditional glazing in a hot summer/cold winter climate, and a double clear conventional window in a cold climate. Based on the simulated results, an indicative suggestion was provided to select an adequate window system for residential building retrofitting in the studied climates or similar climatic regions.

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Investigating the energy saving potential of applying shading panels on opaque façades: A case study for residential buildings in Hong Kong

Cited by 68 publications

References 37 publications

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

Experimental Validation of a Numerical Model of a Ventilated Façade with Horizontal and Vertical Open Joints

A Review of Performance-Oriented Architectural Design and Optimization in the Context of Sustainability: Dividends and Challenges

Energy-Efficient Window Retrofit for High-Rise Residential Buildings in Different Climatic Zones of China

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