8992 KB0 KB0 KB2021Bajsič, IvanBobič, MihaXXXI, 178 str., 31 cmCOBISSID:62592259PID:https://repozitorij.uni-lj.si/IzpisGradiva.php?id=126877URN:URN:NBN:SI:doc-OB7K8U2DslM. Bobičvisokošolska delacombine control-measurement systemscombined pressure-temperature controlDaljinsko ogrevanjedifferential pressure controllersdinamično obnašanje sistemovDisertacijedissertationsdynamic behaviourelectromotor control valveselektromotorni ventiliheat exchangersheating susbstationskrmilniki tlačne razlikekrmilno-merilni sistemiprenosniki toplotepressure-temperature controlsklopljena tlačno temperaturna regulacijatlačna temperaturna regulacijaToplotne postajeRazvoj merilnega sistema za preizkušanje sklopljenega krmilnega sistema tlačno-temperaturne regulacije| doktorsko delo|District heating is one way to reduce the carbon footprint and improve the energy image. For the proper operation of district heating, it is necessary to cool the primary medium as much as possible with consumers, which is largely due to the preparation of hot sanitary water without accumulation. However, such a domestic hot water system is critically linked to the stability of temperature regulation. The physical variables in the primary part of district heating are, in addition to temperatures and flow, also pressures. And because the flow depends on the pressure difference, it affects the quality of regulation. That is why the doctoral dissertation initially examined the design of thermal substations and selected the basic control loop, which consists of a temperature sensor, electronic controller, electric motor drive, control valve, heat exchanger and with or without pressure differential regulator. All of these elements are dynamically characterized by both a mathematical model and that one is numerically solved, and an experimental model, that is compensated for the dynamic error of pressure difference, flow, and temperature sensor. A test rig with an associated measuring system for capturing and displaying measured values was also made, which enables experimental validation of numerical models of elements and, of course, the entire control system, where one can change the inlet temperature on the primary side. Thus, we can show the influence of the flow parameters on the secondary side, the pressure difference on the primary side and the supply temperature, and with the possibility of installing an additional differential pressure controller, one can also get the influence of pressure-temperature control coupling. Digital twin made on the basis of mathematical models and performed numerical experiments, allows numerical experimentationDaljinsko ogrevanje je eden izmed načinov kako zmanjšati ogljični odtis in izboljšati energetsko podobo. Za ustrezno delovanje daljinskega ogrevanja pa je potrebno čimboljše ohlajanje primarnega medija pri porabnikih, čemur v veliki meri doprinese priprava tople sanitarne vode brez akumulacije. Vendar, je tak sistem priprave tople sanitarne vode, kritično povezan s stabilnostjo temperaturne regulacije. Fizikalne spremenljivke v primarnem delu daljinskega ogrevanja so poleg temperatur in pretoka, tudi tlaki. In ker je pretok odvisen od tlačne razlike, le-ta vpliva na kakovost regulacije. Prav zato so bili v doktorski disertaciji uvodoma pregledani načini izdelave toplotnih podpostaj in iz tega je bil izbran osnovni gradnik regulacije, ki je sestavljen iz merilnika temperature, elektronskega regulatorja, elektromotornega pogona, regulacijskega ventila, prenosnika toplote in z ali brez regulatorja tlačne razlike. Vsi ti elementi so dinamično okarakterizirani tako z matematičnim modelom, ki je numerično rešen in eksperimentalnim modelom, ki je kompenziran za dinamični pogrešek merilnikov tlačne razlike, pretoka in temperature. Izdelano je bilo tudi merilno preizkuševališče s pripadajočim merilnim sistemom za zajem in prikaz merjenih vrednosti, ki omogoča eksperimentalno validacijo numeričnih modelov elementov in seveda celotnega regulacijskega sistema, pri čemur lahko spreminjamo vhodno temperaturo na primarni strani, tlačno razliko na primani strani in pretok na sekundarni strani. Tako lahko pokažemo vpliv parametrov pretoka na sekundarni strani, tlačne razlike na primarni strani in dovodne temperature, ter z možnostjo vgradnje dodatnega krmilnika tlačne razlike dobimo tudi vpliv sklopljenosti tlačno temperaturne regulacije. Digitalni dvojček izdelan na osnovi matematičnih modelov in izvedenih numeričnih eksperimentov, le-ta pa omogoča numerično eksperimentiranjeTEXTvisokošolska delatheses and dissertationsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo