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Pastato aktyviosios šiluminės talpos įtaka patalpų mikroklimatui bei energijos poreikiams / Influence of active heat capacity on microclimate and energy demand of a buildingValančius, Kęstutis 22 March 2007 (has links)
The main aim of the work is to investigate unsteady indoor thermal factors’ influence on premises microclimate, energy demand and installed heat power. Tasks of the work: 1. To investigate evaluation methods of thermal characteristics of a building which have influence on unsteady heat transfer, and to point out the main and determining factors. 2. To investigate dynamic thermal characteristics of a building in an experimental way. 3. To describe unsteady heat transfer processes in buildings on the basis of energy conservation law for a control volume with the help of active heat capacity conception and to adapt calculation methods for practical use. 4. To estimate the influence of active heat capacity on premises microclimate, design heat power and energy use.
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Sekliojo geoterminio šildymo sistemų vertikalaus kolektoriaus kompiuterinis modeliavimas / Computer simulation of a vertical heat exchanger for shallow geothermal systemsValantinavičius, Mantas 24 February 2011 (has links)
Sekliojo geoterminio šildymo sistemos vis plačiau naudojamos individualios ir visuomeninės paskirties pastatų šildymui. Tokių sistemų viena svarbiausių dalių yra kolektorius, tiekiantis žemės šilumą šilumos siurbliui. Nuo tinkamo kolektoriaus parametrų parinkimo labai priklauso geoterminio šildymo sistemos efektyvumas ir jos įrengimo kaštai. Inžineriniams kolektorių parametrų skaičiavimams plačiai naudojami artutiniai, gana apytiksliai metodai. Šiame darbe atliktas vertikalaus U-tipo kolektoriaus kompiuterinis modeliavimas, baigtinių elementų metodu, panaudojant COMSOL Multiphysics kompiuterinių programų paketą. Išspręstas 3D šilumos laidumo uždavinys, leidžiantis tiksliau įvertinti kolektoriaus parametrus. Ištirta kolektoriaus šilumos srauto priklausomybė nuo gręžinio gylio, kolektoriuje tekančio šilumnešio greičio bei temperatūros, užpildo, grunto ir šilumnešio parametrų. / Geothermal heating systems are becoming increasingly popular to generate heat for public and individual buildings. But they have some disadvantages, most notable of which is that such systems require major investments in geological research and the installation of the thermal heat exchanger. One of the most important components in this type of systems is a heat exchanger, supplying the geothermal heat to the heat pump. Selecting the proper parameters of a heat exchanger is critical for overall efficiency and installation costs of a geothermal heating system. Simulations of engineering parameters of heat exchangers are based on quite approximate methods. In this work, we carried out a Finite Element Method computer simulation of a vertical U-type heat exchanger using the COMSOL Multiphysics software package. We solved a 3D heat conduction problem, allowing more accurate assessment of vertical U-type heat exchanger parameters, such as the thermal resistance and heat flux, depending on geometry of the wells, ground and soil parameters.
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