Multi-objective optimisation framework for designing office windows: quality of view, daylight and energy efficiency

Abstract

This paper presents a new, multi-objective method of analysing and optimising the energy processes associated with window system design in office buildings. The simultaneous consideration of multiple and conflicting design objectives can make the architectural design process more complicated. This study is based on the fundamental recognition that optimising parameters on the building energy loads via window system design can reduce the quality of the view to outside and the received daylightboth qualities highly valued by building occupants. This paper proposes an approach for quantifying Quality of View in office buildings in balance with energy performance and daylighting, thus enabling an optimisation framework for office window design. The study builds on previous research by developing a multi-objective method of assessment of a reference room which is parametrically modelled using actual climate data. A method of Pareto Frontier and a weighting sum is applied for multi-objective optimisation to determine best outcomes that balance design requirements. The Results reveal the maximum possible window to wall ratio for the reference room. The optimisation model indicates that the room geometry should be altered to achieve the lighting and view requirements set out in building performance standards. The research results emphasise 2 the need for window system configuration to be considered in the early design stages. This exploratory approach to a methodology and framework considers both building parameters and the local climate condition. It has the potential to be adopted and further refined by other researchers and designers to support complex, multi-factorial design decision-making.

A review of select human-building interfaces and their relationship to human behavior, energy use and occupant comfort

“…For example, a variety of window features and design variables such as window size, shape and location within the facade, window opening type and opening angles/percentages, and shading devices could influence the occupants interaction [42], [70], or how windows usability affects IAQ [52].Some blinds/curtains configurations may prevent the proper operation of the window. On the other hand, optimizing window design based on only building energy-efficiency can affect occupants' quality of the view to outside and the received daylight [72]. Moreover, when designed focusing on limited aspects, windows may be then difficult to use.…”

A Novel Approach to Multi-Apertures and Multi-Aspects Ratio Light Pipe

“…CIE is defined as less than 30% of the cloud, and also direct sunlight is considered [51]; This sky has developed 15 types of skies. Methodology background especially in [52] and [53] show that the best choice for conducting the simulation is "CIE sky". Therefore, the "standard clear sky CIE'' is selected for the simulation.…”

Impact of adjustment strategies on building design process in different climates oriented by multiple performance

“…A common feature of research in the building design process is the adoption of simulation software to obtain building performance data [42]. For example, Pilechiha et al focus on the trade-offs of window design on the quality of views, daylight and building energy loads in an office room [44]. Wate et al presented a framework for the quantification and decomposition of uncertainties in a dynamic building performance (heating and cooling load) simulation of a hypothetical office building [45].…”