Life cycle cost analysis of the ventilation system in Stockholm’s road tunnels

Abstract

Swedish Transport Administration (Trafikverket) invests millions of dollars, into its annual budgets to purchase heavy equipment. Given the enormous costs of acquiring, operating and maintaining these assets, it is important to optimise their replacement. This study presents a practical economic replacement decision model to identify the economic lifetime of the ventilation system used by Trafikverket in its Stockholm tunnels. The proposed data driven optimisation model considers operating and maintenance costs, purchase price and system resale value for a ventilation system consisting of 121 fans. The study identified data quality problems in Trafikverket's MAXIMO database. It found the absolute economic replacement time (ERT) of the ventilation system is 108 months but for a range of 100 to 120 months, the total cost remains almost constant. Sensitivity and regression analysis showed the operating cost has the largest impact on the ERT. The results are promising; the company has the possibility of significantly reducing the life cycle costs of the ventilation system by optimising the replacement schedule. In addition, the proposed model can be used for other systems with repairable components, making it applicable, useful, and implementable within Trafikverket more generally.

Systematic Review of Life Cycle Assessment and Life Cycle Cost Analysis for Pavement and a Case Study

“…As a result, reducing the initial construction cost, the decision-makers compromise the environmental and social entities. A sustainable infrastructure multi-criteria preference assessment of alternative for early design (SIMPLE-Design) strategy was formulated, which incorporates the indifference curve to assess the decision-makers in dealing with the back-and-forth relationship between different alternatives [125]. Whereas the indifference curve needs to be further extended with the inclusion of more trade-off entities to improve the decisionmaking in diverse scope.…”

“…The LCCA, future cash flows, feedback, and incorporating the project performance with sustainability can assess the process of decision making towards the selection of sustainable options for a construction project. Interpreting the principle of LCA with LCCA to demonstrate the sustainability that asses the quality, time, and cost of a project [6], which is very useful for new and repairable systems because, at some point in their life span, their operating and maintenance costs and impact will exceed their acquisition costs [125].In many studies, the researchers developed some models or frameworks that try to minimize the limitation of the existing methodologies for specific parameter or areas. He, et al [134] developed a Decision support system with the integration of LCA and LCCA which allows the practitioners to evaluate a sustainable project alternative by identifying economic, social, and environmental impact.…”

Life Cycle Assessment and Life Cycle Cost Analysis in Infrastructure Projects: A Systematic Review

“…The LCCA, future cash flows, feedback, and incorporating the project performance with sustainability can assess the process of decision making towards the selection of sustainable options for a construction project. Interpreting the principal of LCA with LCCA to demonstrate the sustainability that asses the quality, time and cost of a project [6], which is very useful for new and repairable systems because, at some point in their life span, their operating and maintenance costs and impact will exceed their acquisition costs [117].…”

Analisis Umur Mesin Dan Total Biaya Pada Mesin Press Menggunakan Metode Life Cycle Cost Di Pt. Xyz

“…Life Cycle Cost (LCC) adalah perhitungan berupa penjumlahan perkiraan biaya dari awal hingga akhir waktu suatu peralatan atau proyek sebagaimana ditentukan oleh studi analisis dan perkiraan total biaya yang dialami selama hidup. (Al-Chalabi, 2017) II. TINJAUAN PUSTAKA…”