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|Language of final thesis:||Slovak|
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|Title of the thesis:||Management of the life cycle costs of buildings|
|Summary:||The name of my diploma thesis is the "Management of the life cycle costs of buildings". The main object of thesis is the cost optimization of the building insulation. The background for the solution of this topic is my bachelor thesis, which consisted of the architectural-structural design of a building. The object has been designed as a four-floor poly-functional building. On the ground floor shops are situated and on the other floors are two- or three-room flats with accessories (cellars, stores, lift, ...). The circuit construction consists of the 440 mm thick Porotherm brick masonry. This designed structure meets the minimal thermo-technical requirements, but its economic efficiency has not been assessed. The reason for revising the cost optimization of the proposed facility is the constant increase of the energy prices, which affect also the increase of the operation costs. The consequences of this situation are the growing requirements for the thermal insulation ability of building constructions. This diploma thesis consists of three chapters. The first chapter is focused on the management of the construction works, which goal is to constantly increase the ratio between the building's value and the costs expended throughout its life cycle. The second chapter takes name "Life cycle costs of buildings", where the basics of the Life cycle costs method (LCC), the order of the LCC, the basic conditions for the variant comparison and the methodology for calculating the life cycle costs of building constructions are defined. The third chapter is elaborated on the basis of the knowledge gained from previous chapters. In order to meet the objective of the diploma thesis, the third chapter is focused on the design of the object's circuit construction variants. There are described four variants, which should lead above all to the economic efficiency. 1. Variant: basic composition - circuit consists of the 440 mm thick Porotherm brick masonry with thermal insulating coating. 2. Variant: is designed as circuit construction, which consists of the 440 mm thick Porotherm brick masonry insulated with 50 mm thick polystyrene. 3. Variant: is designed as circuit construction, which consists of the 300 mm thick Porotherm brick masonry insulated with 120 mm thick polystyrene. 4. Variant: consists of the 300 mm thick Porotherm brick masonry insulated with the 105K Krupizol System. The system 105K Krupizol consists of wood-cement boards filled with mineral wool. The thermal insulation properties of these variants were assessed using thermo-technical calculations. The thermo-technical calculations were computed by the Teplo 2005 software. Each of variant meets the standard requirements. All the variants have been designed to lead to the saving of the operation costs. The energy balance calculations have been made according to the procedures used by the Enviros, s r.o company, which are according to the standard methodology. The energy consumption of the building was determined based on these calculations for the different variants of the circuit construction. Then it was possible to determine the energy savings. The highest energy savings 47 GJ/year are in the third variant, which means that the annual cost savings are in average 1 081,57 eur. The next step was the determination of the investment costs. The amount of the investment costs has been determined based on the unit prices of the proposed variants. The basis for the determination of these prices has been the Cenkros program and relevant materials prices available on the Internet. The minimum investment costs are in the third variant, totally 12 322, 57 eur. The previous calculations have become the basis for the economic efficiency assessment. The assessment of the variants was realized by the multi-criterion decision method. The Points Method and the Method of the Basic Variant have been used. Three criteria were set for both methods. Two minimization criteria - the investment costs criterion and the energy savings criterion. One maximization criterion is defined by the amount of thermal resistance of the structure. For both methods is the optimal variant the third variant. Other methods that were used for assessing the efficiency of the variants are the Net Present Value (NPV) and the Return Period (RP). The advantage of these methods in comparison to the multi-criterion decision method is that in these methods is the time factor included. The time factor is important because it changes the future value of the investments compared to the investment costs in present. For the calculation of these indicators are also used values obtained from previous calculations. In the NPV method and also in RP calculation the most efficient is the third variant. The return period of the investments of this variant is 19 years. The least efficient variant is the first variant with the return period of 37 years, which is almost two times more then for the best variant, the difference is 18 years. From the various methods that were used to assess the efficiency of the variants, can be clearly determined which of the variants is the most effective. The most effective option, considered from the different perspectives set by the criteria, is the third variant.|
|Key words:||cost building , multicriteria decision, life cycle |
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