Abstract
Prefabrication is undergoing significant growth in the building and construction sector in China. Meanwhile, the integrated measurement and reduction solution for energy consumption is quickly becoming an important target of scientific efforts and research, especially in prefabricated buildings. Embedded energy consumption requirements can potentially be reduced during the manufacturing process of prefabricated components: the opportunity for its reduction can be significant. This paper aims to propose a BIM and LCA integrated approach that enables the energy consumption of prefabricated components in the manufacturing stage to be extracted and calculated in order to obtain a clear, precise understanding of the energy consumption management in prefabrication. To enhance the energy consumption description of prefabricated components, this paper clarifies the contents of energy consumption inventory and related calculation formula in raw material extraction and production, material transportation, and factorized production of prefabricated components, respectively. Specifically, considering that current Industry Foundation Classes (IFC) standard does not accommodate entities with energy consumption information or relationships, it applies the IFC extension method to connect the energy consumption inventory with the BIM model. The proposed approach is applied and verified in a case study from China. This study reveals that energy consumption control should be investigated in the element level considering the differences of various prefabricated components’ requirements in the manufacturing stage.
Highlights
Because of the durable operation period, large body size, and diversified participating stakeholders, building and construction sector generally consumes more energy than other ones
Differing from other works in the same area, the objective of this study is to propose a building information modelling (BIM) and life cycle assessment (LCA) integrated approach that enables the energy consumption of prefabricated components in the manufacturing stage to be extracted and calculated in order to obtain a clear and precise understanding on the energy use in prefabrication
Considering the large amount of energy consumption data created in BIM domain, we focus on two processes: (1) Industry Foundation Classes (IFC) data mapping in energy consumption domains, which include material information and energy consumption inventory
Summary
Because of the durable operation period, large body size, and diversified participating stakeholders, building and construction sector generally consumes more energy than other ones. According to the report of Intergovernmental Panel on Climate Change, buildings comprise approximately 40% of the global energy consumption and contribute about 30% of the total global greenhouse gas emissions annually [1]. Prefabrication is currently undergoing significant growth in China’s building and construction sector [3]. From the sustainability perspective, prefabricated construction can offer significant environmental benefits, such as reduction in construction wastes, by adopting prefabricated building components during the construction stage [5], decreased green gas emissions in manufacturing activities [6], lower impacts at the end of life cycle by disassembling, and relocating instead of disposal [7]
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