Sustainability Efforts Towards Cost Optimization of Building Energy Performance In Architectural Design

Marko Jauลกovec, PhD in Architecture, Assistant Professor, UM FGPA

Metka Sitar, PhD in Economics, Associate Professor, UM FGP

The building industry's high consumption of raw materials and energy has a significant impact on sustainability, with the EU building sector alone responsible for 38% of CO2 emissions and 40% of energy consumption. To reduce emissions, the EU introduced the Energy Performance of Buildings Directives, which Slovenian Regulations for the Efficient Use of Energy in Buildings further harmonized in 2010.

While sustainable architecture guidelines focus on energy efficiency measures, life cycle cost (LCC) evaluation is necessary to assess the cost-effectiveness of building alternatives over their lifetimes. However, many LCC assessment methods exclude operational costs, such as maintenance, service, replacement, cleaning, and demolishing costs, that add considerable value to the building's lifetime period. Additionally, most LCC analyses are limited to life-time periods of 30, 50, or 80 years, missing an assessment of cost evolution during defined intervals. To fill this research gap, a study introduced a comprehensive cost- optimized evaluation method based on Building Information Modelling (BIM) supporting LCC assessment. The study focused on heating systems' cost-effectiveness, with gas, pellet, and heat pump systems evaluated for three advanced prefabricated system envelopes used for a single-family house. Accordingly, the study included five BIM use purposes categories of the BIM based LCC assessment as (i) gather, (ii) generate, (iii) analyze, (iv) communicate, and (v) realize. In order to exploit the automated evaluation process in the computing environment several programs were used, as ArchiCAD, the BIM software for architectural design and modelling for the case study BIM model, and the BEM evaluation, carried out in combination with Legep, a tool providing a database for building elements including the respective costs for construction, energy, water, wastewater, cleaning, maintenance, replacement investment, regular repair, observed in their time cycles over the 50 yearsโ€™ life time.

The study's assessment confirmed the assumption that the optimal value parameters of high-performance buildings do not only depend on energy-efficient design solutions, and operational costs calculated by LCC analyses do not only depend on energy costs. The study outcomes represent a novelty in terms of the feasibility of building constructions, providing interesting insights into sustainable architectural design. Link:

https://www.researchgate.net/publication/338251136_Sustainability_Efforts_towards_Cost_ Optimization_of_Building_Energy_Performance_in_Architectural_DesignOptimizacija_trosko va_u_okviru_odrzive_energetske_ucinkovitosti_zgrada_u_arhitektonskom_projektir

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