Time filter

Source Type

Tirana, Albania

The Polytechnic University of Tirana is a public university located in Tirana, the capital of Albania. It offers degrees in engineering and related fields. Wikipedia.

Merrien-Soukatchoff V.,University of Lorraine | Merrien-Soukatchoff V.,University of Nantes | Korini T.,Polytechnic University of Tirana | Thoraval A.,INERIS
Rock Mechanics and Rock Engineering | Year: 2012

The paper presents the Discrete Fracture Network code RESOBLOK, which couples geometrical block system construction and a quick iterative stability analysis in the same package. The deterministic or stochastic geometry of a fractured rock mass can be represented and interactively displayed in 3D using two different fracture generators: one mainly used for hydraulic purposes and another designed to allow block stability evaluation. RESOBLOK has downstream modules that can quickly compute stability (based on limit equilibrium or energy-based analysis), display geometric information and create links to other discrete software. The advantage of the code is that it couples stochastic geometrical representation and a quick iterative stability analysis to allow risk-analysis with or without reinforcement and, for the worst cases, more accurate analysis using stress-strain analysis computer codes. These different aspects are detailed for embankment and underground works. © 2011 Springer-Verlag. Source

Berberi P.G.,Polytechnic University of Tirana
Journal of Engineered Fibers and Fabrics | Year: 2014

The fiber-to-fiber contact has been considered to be fundamental problem of micromechanics, since the mechanical properties of fibrous assemblies are largely related to the number of fiber-to-fiber contacts. Also, other important properties of fiber assemblies, such as heat conduction, filtration, electrical conduction, and evaporation, are strongly related to bulk fiber arrangement and pore distribution. However, experimental estimation of the number fiber-to-fiber contacts, which is essential in checking the findings of each theory, is a difficult task. Fiber-to-fiber contact in fiber assemblies plays a crucial role in their electrical resistance. Measurement of compression dependence of electrical resistance of a fiber assembly is an effective method for estimating spatial distribution of fiber-to-fiber contact. We have proposed a method and equation to estimate the number of fiber-to-fiber contacts starting from the compressional properties of the electrical resistance of a fiber assembly. Tests carried with samples of different fiber assemblies, both loose staple fibers and woven or knitted fabrics, clearly showed that compressional properties can be accurately approximated by a power function, as predicted by all actual theoretical approaches. However, experimental power index data of the power function vary in a range from 1.5 up to 3.23, which shows that the problem of fiber-to-fiber contact in fiber assemblies remains complex, and more accurate theoretical approaches are needed to describe the phenomenon. The electrometrical method that we propose is a valuable tool for estimating fiber-to-fiber contact and experimentally testing theoretical approaches that tend to describe compressional properties of fiber assemblies. However, more detailed and properly designed tests are needed to verify the method. Source

Zavalani O.,Polytechnic University of Tirana
2011 8th International Conference on the European Energy Market, EEM 11 | Year: 2011

The paper reviews the literature concerning the energy savings achieved by installation of energy management systems and alternative energy-saving systems (such as alternative heating, ventilation, cooling, and lighting systems). Savings through enlightened occupant behaviour and operation of building systems are also discussed. Implementation of energy management system and the reduction of need for mechanical heating and cooling equipment permit the reduction of buildings energy up to 50% and often entail no greater construction cost than conventional design. The energy efficient solutions require an integrated design process, in which the building performance shall be optimized through an iterative process that involves all members of the design team from the beginning. It should be highlighted that an energy management system is installed in a 21 floor building in Tirana. The total electrical energy footprint of the building is 135kWh/m2/year from 200kWh/m2/year that was before the installation of the system. It comes out that the result is in accordance with the energy efficiency goals of a lot of developed countries. © 2011 IEEE. Source

Ormeni R.,Polytechnic University of Tirana
Tectonophysics | Year: 2011

This paper describes the one-dimensional (1D) velocity model computed by VELEST in the SEISAN seismic analysis system, inverting re-picked P-wave and S-wave arrival times recorded during 2002-2006 by the Albanian, Montenegro, Thessalonica and Macedonia seismic networks. The re-picked data yield P-wave and S-wave velocities proved to be more suitable compared to bulletin data for this detailed inversion study. Seismic phases recorded by the Albania seismic network and integrated with data from the Montenegro, Thessalonica and Macedonia networks are used to prepare the Albanian seismic bulletin. Earthquake hypocenters from the Albanian bulletins have also location errors that are negligible for civil protection purposes, large scale seismotectonic analyses and more accurate hypocentral determinations which are necessary for detailed seismotectonic and geodynamic studies. It was noted that the smoothness of the velocity variation increased with depth. A velocity of 5.5. km/s was calculated for the upper crust, 6.1. km/s was calculated for the middle crust and 6.9. km/s was computed for the lower crust. P wave velocity was 7.85. km/s at depth of 50. km and for the upper mantle it is 8.28. km/s. Using the improved velocity model, the earthquakes which occurred in Albania in the past 5. years were able to be relocated, achieving constrained hypocentral determinations for events in Albania. The interpretation of the 1. D velocity models infers interesting features of the deep structure of Albania. These results represent an important step towards more detailed seismotectonic analyses. © 2010 Elsevier B.V. Source

Kodhelaj N.,Polytechnic University of Tirana
Renewable and Sustainable Energy Reviews | Year: 2011

The Llixha Elbasan hot springs are among the most important geothermal springs of Albania. Balneological use dates back centuries, but the first modern use started in 1937. Unfortunately this water has not been used for its energetic values yet. The temperature of the water is above 60 °C and the flow above 16 l/s, thus direct utilization is possible, in particular for space heating. Three-dimensional temperature field calculations and engineering calculations on a heating system with heat exchangers are presented here. The results show that the water temperature is expected to be stable and considerably higher temperature is expected through deep well drilling. Geothermal water of Llixha hot springs fulfils all requirements needed for a district heating system in the region. The University's Campus of Tirana is composed of 29 buildings, which are partially heated through a coal heater. The installed capacity is 2558 kW while the coal consumption is about 920 kg/h. The University's Campus of Tirana is one of the most important areas and with the highest density of population in Tirana, so it is the best area to show the heat exchanger efficiency. The economical analyses prove that the borehole heat exchangers are more convenient than the coal heating systems. © 2011 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations