Poslední příspěvky

  • Experimental Analysis of Steam Condensation in Vertical Tube with Small Diameter 

    Kubín, Milan; Hirš, Jiří; Plášek, Josef (Elsevier, 2016-01-12)
    Thermal design of tubular heat exchanger based on condensation heat of water steam requires knowledge of condensation heat transfer in the each tube. This paper is just aimed on experimental analysis of steam condensation ...
  • Experimental Increase in the Efficiency of a Cooling Circuit Using a Desuperheater 

    Formánek, Marian; Horák, Petr; Diblík, Josef; Hirš, Jiří (Budapest University of Technology and Economics, 2016-05-02)
    Waste heat from cooling circuits can be a useful source of energy for other applications, such as domestic hot water heaters. Furthermore, by removing waste heat from the cooling circuit, its effectiveness can theoretically ...
  • Simulation of energy demands for the internal microclimate formation in BSim software and its verification 

    Šikula, Ondřej; Plášek, Josef (IBPSA-CZ, ČVUT, 2008-11-06)
    This article deals with the description and verifying energy model building in BSim software. Results of energy demands simulation for the internal microclimate formation in a real dwelling house carried out on the basis ...
  • Model dynamického tepelného chování konstrukčních detailů 

    Šikula, Ondřej (IBPSA-CZ, ČVUT, 2008-11-06)
    Podstatou příspěvku je prezentace nového výpočetního modelu určeného pro dynamickou simulaci přenosu tepla v konstrukčních detailech stavebních konstrukcí. Vlastní výpočetní model je založen na numerickém řešení dvourozměrného ...
  • Optimalizace výpočtového modelu místnosti s chladicím trámcem pomocí experimentálního měření v reálných podmínkách 

    Zubíček, Vojtěch; Děckuláček, Zbyněk; Šikula, Ondřej (IBPSA-CZ, ČVUT, 2008-11-06)
    Simulační řešení je v dnešní době jednou z nejaktuálnějších metod, pomocí které lze postihnout výměnu tepla, látky a dynamiku tekutin ve zkoumaném prostoru. Nejzásadnější předpoklad správného zpracovávání numerických CFD ...
  • Hybrid Roof Panels for Night Cooling and Solar Energy Utilization in Buildings 

    Šikula, Ondřej; Vojkůvková, Petra; Šíma, Jiří; Plášek, Josef; Gebauer, Günter (Elsevier, 2015-08-28)
    The aim of this contribution is to evaluate the usability of solar hybrid panels, which were originally optimized for heat load removal from buildings by radiation against the night sky, for water preheating. First we ...
  • Theoretical evaluation of night sky cooling in the Czech Republic 

    Šíma, Jiří; Šikula, Ondřej; Košútová, Katarína; Plášek, Josef (Elsevier, 2014-01-22)
    Energy necessary for cooling of building in summer season makes a big part of energy required for building operation. Redundant heat removal in summer can be realized in various ways. One of possible methods, mainly in ...
  • The Effect of Shielding Barriers on Solar Air Collector Gains 

    Šikula, Ondřej; Plášek, Josef; Hirš, Jiří (Elsevier, 2013-08-22)
    The paper deals with numerical simulations of the impact of location and orientation of the solar air collector located on the roof of a building and on its thermal performance. The solar collector is used to preheat an ...
  • Thermal Bonds of Buildings Structures in Energy Conservation–A Case Study 

    Košútová, Katarína; Šikula, Ondřej; Plášek, Josef (Elsevier, 2012-10-04)
    From energy point of view, very actual topic in Czech Republic is redevelopment of concrete constructions in buildings. The article describes theoretical and experimental evaluation of chosen thermal joints of particular ...
  • Simulation of Deposition the Corrosion Waste in a Water Distribution System 

    Jeleníková, Ivana; Šikula, Ondřej; Peráčková, Jana (EDP Sciences, 2013-04-09)
    In water distribution systems can be found particles of rust and other mechanical contaminants. The particles are deposited in locations where the low velocity of water flow. Where a can cause the pitting corrosion. Is a ...
  • Numerical Simulation of the Effect of Heat Gains in the Heating Season 

    Šikula, Ondřej; Plášek, Josef; Hirš, Jiří (Elsevier, 2012-03-08)
    This paper is concerned with the description and verification of an energy model of a building using the BSim software. The aim is to determine the effect of the basic heat gains on the energy consumption of a building. ...
  • Assessment of condensation of water vapor in the mixing chamber by CFD method 

    Vojkůvková, Petra; Šikula, Ondřej; Weyr, Jan (EDP Sciences, 2015-05-06)
    The analyzed topic belongs to the field of design and operation of HVAC systems, focusing mainly on mixing chambers. The paper deals with problems of condensation and freezing of water vapour on walls of mixing chambers ...
  • Thermal Analysis of Light Pipes for Insulated Flat Roofs 

    Šikula, Ondřej; Mohelníková, Jitka; Plášek, Josef (Elsevier B.V., 2014-10-22)
    Light pipes transmit daylight into building interiors. Their installation into thermally insulated roofs of low energy buildings can be a problem because of thermal bridges and condensation problems. This article is focused ...
  • Thermal CFD Analysis of Tubular Light Guides 

    Šikula, Ondřej; Mohelníková, Jitka; Plášek, Josef (MDPI, 2013-12-03)
    Tubular light guides are applicable for daylighting of windowless areas in buildings. Despite their many positive indoor climate aspects they can also present some problems with heat losses and condensation. A computer CFD ...
  • Počítačové modelování tepelně aktivovaných konstrukcí 

    Šikula, Ondřej (VUTIUM, 2011-06-15)
    Habilitační práce se zabývala teoretickou analýzou tepelného chování tepelně aktivovaných konstrukcí. Stávající teoretické přístupy k řešení této problematiky byly podrobeny zkoumání a kritické analýze. Odtud pak vycházela ...
  • Modelování tepelného sálání v budovách 

    Plášek, Josef; Šikula, Ondřej (VUT v Brně, 2012-03-03)
    Tato kniha je zaměřena na problematiku tvorby sálavé složky vnitřního prostředí budov. Popisuje fyzikální podstatu sdílení tepla sáláním, jeho působení na člověka, klasické metody návrhu tepelných zářičů a shrnuje stávající ...
  • Vertical Distribution of Air Temperatures in Heated Dwelling Rooms 

    Šikula, Ondřej (FINVAC - The Finnish Association of HVAC, 2007-07-13)
    The paper presents an experimental and theoretic research on one of factors influencing the indoor climate in dwelling rooms heated by heating systems, the vertical distribution of temperatures. The paper summarizes results ...
  • 2D Model of Capillary Transport of Water in Aerated Concrete 

    Šikula, Ondřej; Mohapl, Martin (Trans Tech Publications, 2013-01-08)
    Saturation degree of aerated concrete strongly affects not only all its thermal-technica properties, but regarding to the risk of freezing, also the strength properties. The aim of this paper is to discuss existing approaches ...
  • Analysis of local moisture increase of timber constructions on ice arena roof 

    Žák, Antonín; Šikula, Ondřej; Trcala, Miroslav (Trans Tech Publications, 2013-01-08)
    Timber is one of the most used materials for roofing of ice arena because of its very good mechanical properties and low weight. High relative humidity of internal air, low temperature and ice rink presence, which cause ...