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1.
Vpliv energetske učinkovitosti na stroške obratovanja in vzdrževanja večstanovanjske stavbe : magistrsko delo
Matjaž Hozjan, 2023, master's thesis

Abstract: Magistrsko delo obravnava energetsko učinkovitost večstanovanjskih stavb z analizo investicijskih stroškov in obratovalnih ter vzdrževalnih stroškov. Teoretični del zajema koncept energetske učinkovitosti, trende gradnje nizkoenergijskih in skoraj ničenergijskih hiš, relevantno zakonodajo, ter razlago pojmov obratovanja in vzdrževanje stavb. Praktični del vključuje primerjavo investicijskih stroškov in stroškov v času obratovanja stavbe za dva energetska nivoja na konkretnem primeru stavbe, s poudarkom na vplivu toplotnoizolacijskega materiala in stavbnega pohištva. Rezultati kažejo, da povečanje učinkovitosti izboljšuje ekonomičnost obratovanja in vzdrževanja stavbe, kljub višjim investicijskim stroškom. Z analizo ugotavljamo, da debelina in tehnične lastnosti materialov vplivajo na zmanjšanje stroškov ogrevanja ter predstavljajo ključne energetske rešitve za zmanjšanje stroškov ogrevanja večstanovanjskih stavb. Analiza, ki smo jo izvedli v aplikativnem delu je pokazala, da dodatno zniževanje toplotnih izgub v stavbi, ki že izpolnjuje pasivni standard, ni smiselno in skozi kazalce ekonomske upravičenosti investicije, niti upravičeno. Izkazala se je potreba po natančnem načrtovanju in gradnji energetsko učinkovitih stavb kot ključna prioriteta k trajnostnemu razvoju
Keywords: energetsko varčna gradnja, energetska učinkovitost, obratovalni stroški, stroški vzdrževanja, analiza občutljivosti.
Published in DKUM: 21.12.2023; Views: 285; Downloads: 0
.pdf Full text (7,68 MB)

2.
Optimal positioning of mobile cranes on construction sites using nonlinear programming with discontinuous derivatives
Matjaž Hozjan, Uroš Klanšek, 2023, original scientific article

Abstract: Mobile cranes represent conventional construction machinery that is indispensable for the erection of most prefabricated buildings, especially those containing heavy components. However, it is also common knowledge that the engagement of these machines has a significant influence on the environment, various social aspects of the construction process, and its economic benefits. Optimal positioning of the mobile crane on the construction site, primarily driven by the contractor’s interest to perform assembly operations with expensive machinery as effectively as possible, considerably reduces not only the costs of engaging such a machine but indirectly also its negative impacts on construction sustainability. This paper discusses an exact nonlinear model for the optimization task. The optimization model consists of a cost objective function that is subject to various duration and positioning constraints for the mobile crane, including bounds on its degrees of freedom of movement and stop positions. Because the model formulation includes discontinuous and non-smooth expressions, nonlinear programming with discontinuous derivatives (DNLP) was employed to ensure the optimal solution was reached. The model provides the mobile crane operator with exact key information that enables the complete and optimal assembly of the building structure under consideration. Additionally, the information gained on the optimal distribution of the mobile crane rental period to assembly operations allows for a detailed duration analysis of the entire process of building structure erection, which can be used for its further improvement. An application example is given in this study to demonstrate the advantages of the proposed approach.
Keywords: construction sustainability, mobile crane, nonlinear programming with discontinuous derivatives, optimization, positioning
Published in DKUM: 18.12.2023; Views: 336; Downloads: 12
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