Proposal of matrix of indices evaluating performance of daylighting system as a design aid

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630265
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Architectural environment/Equipment
• Research Institution: Tokai University
• Principal Investigator: Iwata Toshie 東海大学, 工学部, 教授 (80270627)
• Co-Investigator(Kenkyū-buntansha): SUZUKI Hirotaka 神戸大学, 工学(系)研究科, 准教授 (60286630) ; ITO Daisuke ものつくり大学, 技能工芸学部, 講師 (10567978)
• Research Collaborator: TANIGUCHI Tomoko
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 建築光環境 / 昼光装置 / 省エネルギー / 気象データ / 直射日光 / 簡易指標

Outline of Final Research Achievements

Daylighting in buildings is recommended and advanced daylighting systems have been developed. In order to aid architects in choosing a suitable daylighting system, several simple indices showing properties for energy-saving and visual comfort are proposed in this study.
Daylighting systems are classified to identify their required properties. Distribution of daylight in systems which utilize mirror reflection can now be modelled by advanced lighting simulation algorithms. Both the visible light and heat gain of daylighting systems (interior blind and exterior blind) are measured by using a special measurement device. Equivalent luminous efficacy, the effective luminous flux coefficient, and the reduction factor of discomfort glare are newly defined. These indices for daylighting systems are measured for standard outside conditions, which are determined from the frequency of climatic conditions. A matrix of these indices is presented.

Free Research Field

建築環境工学