الفهرس 
FM Definition
Methodology and WorkflowOnly 14 pages are availabe for public view
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Abstract
The rapid and continuous rise in the energy costs dictates significant cost control efforts during buildings’ operation phase. Controlling the energy costs task is often assigned to the facility manager, despite the fact that achieving remarkable energy cost reductions are highly governed by the decisions and choices made during earlier phases of the construction project, when the facility manager is not involved. Nonetheless, valuable Building Information Modelling (BIM) data that ought to enable informed cost-effective recommendations early on are not exploited by facility managers, in addition to the absence of a workflow tailored for facility managers that equips them to reach the best cost-effective decisions.
This study aims to create a workflow for facility managers that exploits BIM to reduce energy costs. The workflow proposed presents a means for the facility manager to take a part in the building envelope assemblies’ selection either early on in the project during the design phase, or in the retrofitting phase in order to achieve energy cost savings during the operation phase.
To achieve this aim, case studies are used to apply the workflow, construct a BIM model, perform energy simulations and Life Cycle Costs (LCC) calculations. The building envelope assemblies studied in this research are the external wall assemblies, roof assemblies and glazing assemblies for the external windows. Two different case studies are carried out to compare the LCC of different types of building envelope assemblies. The first case study is a school complex in Jubail, Kingdom of Saudi Arabia (KSA) and the second case study is a commercial office building in New Cairo, Egypt. The economic evaluation techniques used in both case studies on all the assemblies are the present value LCC, benefit-cost ratio, and payback period. Furthermore, a sensitivity analysis is carried out to test the effect of changing the energy escalation rate and unit energy price on the selection. The results of the first case study show that savings up to 18% in the operational energy costs can be achieved just by selecting the proper roof assembly type, whereas operational energy cost savings up to 4% and 8% respectively can be achieved by choosing the suitable wall and glazing assemblies. In the second case study up to 10% savings in operational energy costs can be obtained with the right glazing assembly selection, also a payback period as short as 2 years can be obtained.
Conclusively, the proposed workflow can be used by facility managers or other members of the construction team during the initial design stages of the building project, where cost-effective recommendations for the envelope assemblies can be presented to achieve cost savings afterwards during the operation phase.