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Title: Total energy performance of atria with daylight
Authors: To, DWT
Chan, TK
Keywords: Atrium
Issue Date: 2006
Publisher: Hong Kong Institution of Engineers
Source: HKIE transactions, 2006, v. 13, no. 2, p. 24-30 How to cite?
Journal: HKIE transactions 
Abstract: The current design trend for commercial buildings in Hong Kong is to introduce shopping arcade at the lower floors and provide atrium with daylight. If daylight is properly utilised, the electrical lighting energy can be saved. On the other hand, introduction of atrium will allow the entrance of solar heat which will introduce extra cooling load to the air-conditioning systems. What would be the overall energy performance of a daylighted atrium? Could the saving on electrical lighting power compensate the additional energy expenditure on cooling due to the introduction of atrium? This paper presents a study carried out for three different types of atria in Hong Kong. Energy performance of atria with assumed daylight-linked lighting control is analysed using Computer simulation programs Ecotect and HTB2. The field-measurement of average daylight factor was conducted in real atrium site to validate the simulation results. Different design alternatives on lighting strategies, fenestration glazing types, as well as skylight area and shapes were investigated. The overall energy performance, evaluated with respect to a base case design (same atrium covered with an opaque roof), showed that the daylight-linked lighting controls can provide an annual lighting energy saving around 66% for the three atria studied. The annual total energy consumption of atrium spaces with daylight-linked lighting controls were about 20 to 40% higher than the base case design. This indicates that energy savings from artificial lighting generally cannot compensate the daylight-induced cooling penalty. However, when the glazing type and glazing area of atrium roof light were varied, the result showed that it is possible that the overall energy expenditure on lighting and air conditioning could be smaller than the base case.
ISSN: 1023-697X
EISSN: 2326-3733
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