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Work performance in relation to lighting environment in office buildings
摘要： The purpose of this study was to investigate the effect of lighting environment on the work performance. Orthogonal experiments with three-factor and three-level for each factor were designed and carried out in a laboratory aiming to reveal the relationship between lighting illuminance (ILL), uniformity of illuminance (U-ILL), correlated colour temperature (CCT) and workers’ productivity. Twenty-four participants’ work performance was evaluated by subjective questionnaires, objective physiological tests, accompanied with computerized neuro-behavioural tests assessing six kinds of neuro-behavioural functions. Results illustrate that when exposed to high ILL, U-ILL and CCT environment, participants reported highest satisfaction on productivity and attention, while lowest score on stress, difficulty of conducting work and fatigue. The range value and variance analysis from neuro-behavioural tests demonstrated the appropriate level of each factor and the optimal combination. However, they varied with the type of tests illustrating that lighting conditions could influence neuro-behavioural functions differentially. The improvements of perception, learning and memory function of participants were benefited from high ILL, high U-ILL and high/medium CCT. Low ILL, low U-ILL and moderate CCT were appropriate to increase participants’ thinking and executive performance. Moreover, high quality of tear film crystallization was related to higher illuminance. The present study suggests that it is necessary to design personalized illumination environment for particular workplace.
关键词： Subjective evaluation,Office building,Lighting environment,Neurobehavioral tests,Productivity
更新于2025-09-23 15:23:52
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Deducing the Optimal Control Method for Electrochromic Triple Glazing through an Integrated Evaluation of Building Energy and Daylight Performance
摘要： Electrochromic glass is anticipated as the next generation of solar control glass for construction because it can control the transmittance of the glass itself. This study analyzed building energy and light environment performance by applying electrochromic glass in triple glazing in order to verify both the solar control characteristics of electrochromic glass and its high insulation performance. This paper evaluates the performance of the electrochromic glass developed by our research team in Korea in five control conditions of varying temperatures and solar radiation levels. By analyzing the cooling and heating load, lighting energy, Daylight Glare Index (DGI), and interior illuminance when applying the selected conditions to office buildings, this paper discerns the optimal control conditions for electrochromic glass. To do so, the optical characteristic data of the electrochromic glass was analyzed via an experiment, and the creation of triple glazing for construction was conducted. The performance of electrochromic glass was evaluated by analyzing hourly and yearly data for cooling, heating load, and lighting energy during a typical day in summer and winter. From this analysis, the control condition with an outstanding performance from an energy perspective was identified. The performance of the light environment was assessed, and the EDPI overall evaluation index was used to find the electrochromic glass’ optimum control conditions for integrating energy and light environment.
关键词： electrochromic glazing,EnergyPlus,optical properties,lighting energy,office building,heating and cooling loads,optimum control
更新于2025-09-23 15:22:29
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Determination of economically optimised building integrated photovoltaic systems for utilisation on facades in the tropical climate: A case study of Colombo, Sri Lanka
摘要： Building integrated photovoltaics (BIPV) are becoming a viable solution for clean on-site energy production and utilisation to combat the existing energy crisis. In tropical climates, although rooftops are ideal for photovoltaic (PV) module integration, the available area may be insufficient to meet building energy demand due to the recent high-rise nature of urban buildings, causing a requirement for the utilisation of facades. However, the high angle of solar elevation means that facades are unfavourably oriented towards receiving incident solar irradiation. In addition, the issue exists of high solar heat gains into built spaces. This paper proposes a method to utilise horizontally inclined photovoltaic modules integrated on solar shading devices in order to combat these issues of unfavourable inclination and solar heat gains in commercial office buildings in Colombo, Sri Lanka. Various strategies are introduced and evaluated in terms of their inclination angles and the distance between installations. The results are analysed in terms of economic potential in order to determine which strategies are capable of producing the most electricity and reducing building cooling loads for the lowest installation costs. The results show that horizontal inclinations of PV on facades are capable of generating nearly 8% more electricity as a percentage of the building energy consumption when compared with traditional vertical PV facade installations.
关键词： facades,office building,photovoltaic integrated shading systems,building integrated photovoltaics,optimisation
更新于2025-09-16 10:30:52