Abstract
There are many kinds of façade shading designs which provide optimal indoor daylighting conditions. Thus, considering combinations of different types of façade shading systems is an essential aspect in the optimization of daylighting in the building design process. This study explores (1) how the pattern and different characteristics are evaluated by varying façade shading types and considering their impact on daylighting metrics; and (2) the relative relationships between Daylight Autonomy (DA) and Useful Daylight Illuminance (UDI) with changes of the façade shading types, input parameters, and azimuth orientations. A typical high-school classroom has been chosen as a base model, and seven different façade shading types: vertical louver, horizontal louver, eggcrate louver, overhang, vertical slat, horizontal slat, and light shelf have been applied to eight azimuth orientations for the building. As tools for parametric design and indoor lighting analysis, Design Iterate Validate Adapt (DIVA)-for-Grasshopper has been used to obtain DA and UDI for comparison. Based on the simulation, (1) the effectiveness of the installation of façade shading compared to a non-shading case; and (2) design considerations for façade shading are presented. The result shows that there are some meaningful differences in DA and UDI metrics with the variation of orientation and façade shading types, although all cases of façade shading show some degree of decrease in DA and increase in UDI values. The types of shading devices which produce a dramatic decrease in DA values are the light shelf, horizontal slats, horizontal louvers, and eggcrate louvers. On the contrary, the types of shading devices which produce a dramatic increase in UDI values are the light shelf, horizontal slats, horizontal louvers, and eggcrate louvers. In the case of the vertical and vertical slat shading, the improvements of UDI values are significant in the east and west orientations. This demonstrates that the application and design of shading devices in certain façade orientations should be carefully considered for daylight control. Also, the results show that UDI explains relatively well the daylight performance in the case of the installation of a shading device.
Highlights
The design process plays an important role in developing sustainable buildings
This study explores the changes in daylight illuminance in the range of 100 to 300 lux, which the Daylight Autonomy (DA) range excludes, and which is Useful Daylight Illuminance (UDI) values with the application of various façade shading types and their characteristics of effective even though the DA does not consider the range; (2) UDI perceives that a range controlling the light condition
The main difference between the vertical, horizontal, and eggcrate louver, and vertical slat louver, horizontal slathorizontal louver and light shelfand is that the former group variation in the the overhang, vertical slat louver, slat louver light shelf is that the has former group has the vertical slat louver, horizontal slat louver and light shelf is that the former group has the overhang, overhang, vertical slat louver, horizontal slat louver and light shelf is that the former group has thelouver overhang, vertical slat louver, horizontal slat louver and light shelf is that the former group has depth, whereas the latter groupthe modifies the angle of thethe shading
Summary
The design process plays an important role in developing sustainable buildings. In the case of different design processes, outcomes such as human comfort, reduction of energy consumption, and utilization of solar energy are of utmost importance. The Leadership in Energy and Environmental Design (LEED) version 4 daylight credit starts to consider DA as a climate-based analysis for the evaluation of lighting conditions [30], and to connect building occupants’ comfort, provide glare control, and minimize lighting energy usage [31]. This research starts by analyzing the effect of façade are evaluated by varying façade shading types and considering their impact on daylighting metrics. UDI values with the application of various façade shading types and their characteristics of effective even though the DA does not consider the range; (2) UDI perceives that a range controlling the light condition. This study façade exploresshading design strategy through combined engineering technology and comprehensive understanding of the changes in DA and UDI values with the application of various façade shading types and their of controlling the light condition. Organized façade shading design strategy through combined engineering technology and comprehensive understanding of manual façade shading design methods
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