Scholarly record
CALCULATIONS OF COST-OPTIMAL LEVELS OF ENERGY PERFORMANCE REQUIREMENTS FOR RENOVATED BUILDINGS AND BUILDING ELEMENTS: A LATVIAN CASE
Abstract
This research work describes cost-optimal calculations for existing buildings of different categories and main building elements, as well as comparison with the existing energy requirements. Calculations are based on Directive 2010/31/EU and on the Commission Delegated Regulation (EU) No 244/2012 with the associated Guidelines. Those documents are used both ? for the calculation of cost-optimal energy performance for a whole building (MWh or kWh/m2 per year) and for the assessment of optimal U-value for different building elements. The study starts with the choice of reference buildings according to the statistical data and selection of materials, constructions and systems incl. renewable energy resources, and defining of appropriate packages of energy saving measures. In the next step calculations of final heating and cooling energy, as well evaluation of total primary energy consumption (MWh) are determined have been made. Parallel to that costs of construction works are being estimated according to an actual market situation. The economic calculations are carried out, taking into account expected energy price increase, discount rate and operating costs during the calculation period. As a main result cost-optimal values for both - U-values for different structures after insulation/replacement and for total energy level of overall building renovation are determined. Comparison with existing requirements has been made. In parallel with this, the sensitivity analysis of the future energy prices, operating/maintaining costs and renovation costs is performed. It is shown, that the role of mentioned assumptions may me even decisive in determining of the global costs and cost-optimal levels.
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References9
European Parliament, Directive 2010/31/EU of the European Parliament and the Council on the energy performance of buildings, Official Journal of the European Union, 2010, pp. 13-35.
European Parliament, Directive 2002/91/EC of the European Parliament and the Council on the energy performance of buildings, Official Journal of the European Union, 2002, pp. 65-71.
Commission Delegated Regulation (EU) No 244/2012 supplementing Directive 2010/31/EU of the European Parliament and of the Council on the energy performance of buildings by establishing a comparative methodology framework for calculating cost-optimal levels of minimum energy performance requirements for buildings and building elements, Official Journal of the European Union, 2012, p. 18 36.
Latvian Cabinet of Ministers, Cabinet Regulation No. 383, Regulations Regarding the Energy Certification of Buildings, 2013.
Latvian Construction Standard LBN 002-15, Thermotechnics of Building Envelopes, 2015.
The Ministry of Economics of the Republic of Latvia, Informative report "Long-term strategy for building renewal", 2017. https://ec.europa.eu/energy/sites/ener/files/ documents/lv_building_renov_2017_lv.pdf.
Latvian Construction Standard LBN 501-17, Procedure for Determining Construction Costs, 2017.
International Organization for Standardization, ISO 52016-1:2017: Energy performance of buildings Energy needs for heating and cooling, internal temperatures and sensible and latent heat loads Part 1: Calculation procedures, 2017.
Latvian Cabinet of Ministers, Cabinet Regulation No. 348, Regulations Regarding the Methodology for Calculating the Energy Performance of Buildings, 2013.
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