| Abstract [eng] |
The aim of the final study project of the master's studies is to evaluate the influence of external partitions and thermal bridges on the energy efficiency of a single-apartment house. After the analysis of the scientific and technical literature, the main factors affecting the energy efficiency of single-apartment residential houses and its components - the thermal properties of partitions, the solutions of longitudal thermal bridges - have been determined. The methodological part describes the tools used for the research, the multi-criteria evaluation method of MOORA and the algorithm and methodology of the expert survey. During the study, three single-apartment residential houses with identical architectural solutions and indicators were modeled, using different structural systems: massive masonry-reinforced concrete structural system, light wood frame structural system, innovative LGS structural system. In the study, the calculation of the thermal properties of the partitions that make up the structural systems is carried out, evaluating the point thermal bridges, the longitudinal thermal bridges of the joints of these constructed partitions are calculated. After selecting identical engineering systems and other technical input data, the evaluation of the energy efficiency of three alternatives was carried out. According to the results of the energy efficiency indicators, the alternatives are compared with each other, giving the indicators relative weights, which were obtained during the survey of certified construction experts. The most efficient alternative of the structural system is selected by the multi-criteria evaluation method MOORA. The most efficient of the three compared alternatives is the LGS structural system. This system stood out from the other evaluated alternatives due to the negative balance of longitudal thermal bridges. The thermal capacity of the building does not have a decisive influence on the energy efficiency results. When designing buildings, the greatest attention should be paid to the selection of efficient transparent partitions and suitable solutions for long thermal bridges around the perimeter of these partitions. The final project of master's studies consists of: summaries in Lithuanian and English, introduction, three chapters, conclusions, bibliography and appendices. Project scope: 80 pages with 127 pages of appendices. The list of used literature and information sources consists of 76 entries. |
