Evaluating the Influence of Varied External Shading Elements on Internal Daylight Illuminances

Abstract

This paper presents an assessment and comparison of the effects of static and kinetic external shading elements on the dynamic measurement of daylighting. For this purpose, we used a method and parametric tool developed previously for the design and analysis of external shading elements in buildings. The proposed approach was used to compare static and dynamic movement scenarios for achieving optimal internal adjusted useful daylight illuminances (AUDI). The current paper presents the results of a methodical analysis, which compared various types of louvers in static and dynamic operation scenarios for a typical office in a Mediterranean climate. The results show that dynamically adjusted louvers perform notably better than fixed or seasonally adjusted modes of operation. The results show that dynamic operation scenarios can increase the AUDI by up to 51%. The results also show that in some conditions the existing rules of thumb fail to predict the correct design approach to louver geometry and that the use of rules of thumb in architectural daylight design needs to be revaluated.

The optimization of louvers shading devices and room orientation under three different sky conditions

“…Previous study incorporating MOO and louver shading has been focusing on measuring daylighting inside the simulated room [3,7,11,12,38]. However, this paper has succeeded in providing an insight in daylight performance comparison utilizing louver shading device in three different sky condition.…”

“…count, depth, and direction with a total number of 200 variations for each shading type, the results showed a meaningful difference in the use of two different daylight metrics with different shading types and orientation and concluded that UDI explains daylight performance relatively well. Grobman et al [12] presented an assessment and comparison of the static and kinetic external shading elements on a dynamic measurement. Parametrically, louver shading in a simulated office was operated to achieve optimal adjusted useful daylight illuminance (AUDI) in a Mediterranean climate.…”

External Shading Devices: Should the Energy Standard Be Supplemented with a Production Stage?

“…For example, Perez and Capeluto [16], in their search for building design variables that had a significant influence on the energy needs of a typical school room, reported that the influence of the window shading variable was comparable to that of wall insulation. Grobman et al [17] studied the influence of static and dynamic external shading devices on the daylighting performance of a typical office space in a Mediterranean climate and noted that, when compared with static shading, dynamic shading increased the adjusted useful daylight illuminances by up to 51%. Yezioro and Capeluto [18] proposed the ENERGYui model, which can evaluate energy according to the SI5282-2 standard by changing the design variables; external shading is considered to be among the important architectural geometric parameters.…”

Comparison of Daylight Performance in Three Different Sky Conditions for Various Window Shading Types

“…Recently, the design and window shading roles are globally evaluated and investigated through design experiments and research. Grobman (2020) investigates the different designs of shading in simulated 3m x 7m box parametrically. The study was aimed to compare the effect of static and dynamic shading devices in the Mediterranean context.…”

“…The study was aimed to compare the effect of static and dynamic shading devices in the Mediterranean context. The results reveal that the dynamic operation can increase Adjusted Useful Daylight Illuminance (AUDI) by 51% [5]. In the other study, Lee (2017), explores different characteristics of several parts of the façade, considering their impact on daylighting.…”