20.500.12556/RUL-170093 Računski model prenosa toplote v vodocevnem parnem kotlu Mathematical model of heat transfer in water-tube steam boiler V nalogi smo obravnavali razvoj in validacijo 1D računskega modela za simulacijo prenosa toplote v vodocevnem parnem kotlu. Kurišče smo modelirali kot enoten volumen s konstantno temperaturo dimnih plinov in konstantno toplotno prehodnostjo na ognjevzdržno oblogo. Sevalni in konvektivni prekat, ter pregrevalnike pare, pa smo modelirali po 1D celični metodi, kjer se za vsako celico izračuna koeficient toplotne prehodnosti in vse pripadajoče bilančne enačbe. Prenos toplote skozi grelnik vode smo izračunali z uporabo metode srednje logaritemske temperature. Temperature medijev skozi vse robne pretočne preseke ogrevalnih površin niso znane, poleg tega je narava prenosa toplote nelinearna, zato smo razvili algoritem za iterativno reševanje računskega modela. Rezultati validacije so pokazali, da je predlagan računski model primeren za dimenzioniranje tovrstnih energetskih naprav in pri znanih dimenzijah omogoča simulacijo odziva na izbrane vhodne parametre. In this paper, we discussed the development and validation of a 1D mathematical model for simulating heat transfer in a water-tube steam boiler. The furnace chamber was modeled as a uniform volume with a constant flue gas temperature and constant flue gas heat transfer coefficient to the refractory surface. The radiant and convective pass, as well as the steam superheaters, were modeled using the 1D cell method, where the heat transfer coefficient and all associated balance equations are calculated for each cell. The heat transfer through the economizer was calculated using the mean logarithmic temperature method. The temperatures of the media through all edge flow cross-sections of the heating surfaces are unknown, and in addition, the nature of the heat transfer is nonlinear, so we developed an algorithm for iterative solver. The validation results showed that the proposed mathematical model is suitable for dimensioning such energy devices and, with known dimensions, allows for simulation of the response to selected input parameters. parni kotel prenos toplote ogrevalne površine prenosniki toplote računski modeli steam boiler heat transfer heating surfaces heat exchangers mathematical models true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-07-02 12:58:32 2025-07-02 12:58:33 2025-07-03 14:15:49 0000-00-00 00:00:00 2025 0 0 XX, 54 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.2:621.18:004.94(043.2) 271149 241315331 39095.pdf 39095.pdf 1 813F1F343B9000101EC247AD384BBFC3 d1c11ab762eaefcfebbe1d6db3bb63866bb1f7ab35b0b99d5f3c489a369ee2ea 99bd357b-5731-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212019 Fakulteta za strojništvo 0 0 0