Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Session 18: Daylight & Visual comfort
Thursday, 26/Aug/2021:
10:30am - 11:15am

Session Chair: Gregers Reimann, IEN Consultants Sdn Bhd
Location: Room 3 - Room 013, Building: 116

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10:30am - 10:45am

Visual performance of home offices: a case study

Ceren Sarikaya, Christiane Berger, Ulrich Pont, Ardeshir Mahdavi

Department of Building Physics and Building Ecology, TU Wien, Austria

The design of the lighting systems in conventional office environments is typically supported by domain specialists. However, the same is not true of home offices, whose arrangements frequently result from ad hoc and do-it-yourself activities. This circumstance may have ramifications for occupants' health, comfort, and productivity, given the recent significant increase in home officing prevalence. In this context, the present contribution reports on a detailed case study of lighting conditions in a number of home office settings. Thereby, nine home offices (located in the city of Izmir, Turkey) were investigated. The home offices serve a variety of professionals. The study involved measurements under daylight and electrical light conditions. Moreover, simulations were conducted to explore improvement opportunities. The investigation results point to a highly uneven level of performance across the selected cases. The visual conditions were found to be generally better under daylighting conditions, despite some instances of excessive illuminance. Electrical lighting analysis results reveal in many cases insufficient light levels due, in part, to unsuitable types and positions of the luminaires. Simulation-based optimization exercises suggest that the visual conditions in the studied home offices can be considerably improved via changes in the number and types of the luminaires.

10:45am - 11:00am

Determining A Proper Daylighting Design Solution for Visual Comfort and Lighting Energy Efficiency: A Case Study for High-Rise Residential Building

Zehra Aybike Kılıç, Alpin Köknel Yener

Istanbul Technical University, Turkey

An energy-efficient building envelope that allows to provide visual comfort conditions in the interior is possible with the optimization of aperture size, glazing type and solar control strategy, which are the major design parameters of daylighting system design. A proper daylighting system should provide a balance of natural light and solar heat gain. This creates not only a pleasant and attractive visual and thermal environment but also reduces lighting energy consumption and heating/cooling energy load. Particularly, In high-rise buildings where large openings that allow maximum daylight and view out are preferred, evaluation of daylight performance by considering the major parameters of the building envelope design becomes crucial in terms of ensuring occupants’ comfort and improving energy efficiency. Moreover, it is increasingly necessary to examine the daylighting design of high-rise residential buildings, considering the share of residential buildings in the construction sector, the duration of occupation and the changing space requirements.

This study aims to identify a proper daylighting design solution considering window area, glazing type and solar control strategy for a high-residential building in terms of visual comfort and lighting energy efficiency. The dynamic simulations are carried out/conducted by DIVA for Rhino version The results are evaluated with the climate-based daylight metric(DA) to demonstrate daylight availability in the space and luminous based metric (DGP) to describe the visual comfort conditions related to glare. Furthermore, it is also analysed the lighting energy consumption occurred in each scenario to determine the optimum solution reducing lighting energy consumption by optimizing daylight performance. The results revealed that it is only possible the reduction in lighting energy consumption as well as providing visual comfort conditions in buildings with the proper daylighting design decision regarding glazing type, transparency ratio and solar control device.

11:00am - 11:15am

Low-cost smart solutions for daylight and electric lighting integration in historical buildings

Michelangelo Scorpio1, Giovanni Ciampi1, Niko Gentile2, Sergio Sibilio1

1Department of Architecture and Industrial Design, University of Campania "Luigi Vanvitelli"; 2Department of Architecture and Built Environment, Faculty of Engineering, Lund University

Energy efficiency and visual comfort in buildings are one of the main goals pursued by policies and strategies. Research have shown that the correct integration of daylight and electric lighting reduces the energy use in buildings, while improving visual comfort. Smart shading systems, especially those electrically controlled, play an important role to control solar radiation. Similarly, smart and dimmable/tunable lighting can help to adjust the artificial light to the real users’ needs. Despite benefits, their integration can be challenging in contexts like historical buildings, where retrofit solutions must protect the integrity of the building. This calls for simpler, possibly plug-and-play and cheap solutions.

This paper will present preliminary results of an ongoing living lab study investigating how artificial lighting systems can be integrated with shading systems, placing human comfort at the heart of the study and yet saving energy. A manually controlled, commercial and low-cost smart system integrating two motorized shading devices and six dimmable LED luminaires with a different selection of CCT were installed in a private office on the first floor of the Department of Architecture and Industrial Design, University of Campania (south of Italy). Both shading and electric lighting are remotely controlled from the desk. The system installation is not intrusive and suitable for listed buildings. Depending on Covid-19 restrictions, up to six subjects will be introduced to the system and they will occupy the office for a period of two weeks. Indoor and outdoor lighting conditions, system use, and energy are constantly monitored in order to assess how the people use shading and lighting upon varying the boundary conditions.

The hypothesis is that accessible manual controls, together with users’ training, guarantee quasi-optimal use patterns of shading devices and artificial lighting, possibly comparable to those of automatic systems.

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