The evaluation of energy performance of atrium space with daylight-linked lighting control

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The evaluation of energy performance of atrium space with daylight-linked lighting control


Author: Chan, Tsz-kin
Title: The evaluation of energy performance of atrium space with daylight-linked lighting control
Degree: M.Eng.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Daylighting -- Evaluation
Atrium buildings -- China -- Hong Kong -- Lighting
Department: Dept. of Building Services Engineering
Pages: xvii, 133 leaves : ill. (chiefly col.) ; 30 cm
Language: English
InnoPac Record:
Abstract: The atrium is one of the common architectural features of commercial buildings and shopping arcades in Hong Kong. Employing daylight-linked lighting control in atrium space not only reduces the energy consumption of artificial lighting, but also reduces the heat dissipation from lighting fittings, and thus reduces the cooling requirements. Nevertheless, the atrium skylight possibly admits a great deal of solar heat gain which penetrates to the atrium space, resulting in extra cooling penalty to air-conditioning systems. Up to now, there have been few investigations of the interaction between daylight, artificial lighting, and air-conditioning systems in atrium spaces. As a result, the trade-off between reduction in artificial lighting due to daylighting and daylight-induced cooling penalty is still questionable. This dissertation presents an analysis of the impact of selected design alternatives on energy performance of an atrium space with daylight-linked lighting control. Computer simulation programs Ecotect and HTB2 were used to predict the average daylight factor and cooling loads of three selected atrium spaces under various design alternatives. The field-measurement of average daylight factor was conducted in real atrium site to validate the simulation results. Design alternatives focused on lighting strategies, fenestration glazing types, as well as skylight area and shapes. The performance indicators, evaluated with respect to basecase design (covered with opaque roof), included the potential lighting energy savings due to daylighting, increment/decrement of cooling energy for air-conditioning systems, and increment/decrement of annual total energy consumption for atrium space. The results indicate that the daylight-linked lighting controls resulted in between 34.1% and 66.7% of annual lighting energy savings. The daylight-linked dimming control apparently had 2% to 3% more energy savings than the daylight-linked on/off control. The annual cooling energy decreased with decreasing solar heat gain coefficient and increasing the U-value of the glazing. The results revealed that double clear glazing reduced the cooling energy by about 24% to 44%, low-E glazing by about 30% to 47%, tinted glazing by about 32% to 48%, and reflective glazing by about 55% to 63%. Besides, reducing the skylight area by 50% resulted in 37% to 51% reduction in annual cooling energy. Additionally, flat skylight contributed to 14% to 21% annual cooling energy savings as compared to pitched or pyramidal skylight. The annual total energy consumption of atrium spaces with daylight-linked lighting controls were about 21% to 40% higher than the basecase design. This indicates that energy savings from artificial lighting generally cannot compensate the daylight-induced cooling penalty. When the impact on glazing systems and atrium architectural designs were studied, the results showed that the annual total energy consumption of three atrium spaces fluctuates between energy penalties and energy savings. The reflective glazing resulted in energy savings from 0.2% to 56.5% while reducing skylight area by 75% yielded highest annual total energy savings between 23.5% and 57.5% in the three atriums studied. Since the glazing types and skylight areas trade-off with each others, the daylight aperture was used to assess the optimum selections for those two parameters in this study. With respect to energy-efficient atrium design, it was shown that the effective daylight aperture should range from 0.4 to 0.45.

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