Numeričko modeliranje i analiza izmjene topline u solarnom spremniku

master's thesis

• Title (english): Numerical modelling and analysis of heat transfer in solar storage tank
• Author: Jakša Sinčić
• Mentor: Damir Dović (mentor)
• Mentor: Ivan Horvat (komentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-05-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

U sklopu diplomskog rada numerički je modelirana izmjena topline i strujanje vode unutar akumulacijskog spremnika solarnog toplovodnog sustava za pripremu potrošne tople vode i grijanje prostora. Dinamičke simulacije samog rada spremnika provedene su za odabrani period dana i režim korištenja u računalnom programu ANSYS Fluent. Zapremnina spremnika iznosila je 283,7 l, a odabrani učini izmjenjivača topline solarnog kruga te pomoćnog izvora prilagođeni su odabranom solarnom sustavu, dnevnoj potrošnji tople vode te potrebnoj energiji za grijanje prostora. Naglasak je dan analizi provođenja topline te slobodnoj konvekciji na temperaturnu raspodjelu u spremniku. Uspoređeni su rezultati simulacija s rezultatima proračuna temperaturne raspodjele u spremniku prema normi prEN 15316-5:2021, prilikom čega je spremnik podijeljen na više volumnih dijelova (segmenata). Zaključno, procijenjen je utjecaj rezultata simulacija i proračuna prema standardiziranoj proceduri na toplinsku učinkovitost solarnog kolektora u promatranom vremenskom periodu.

Abstract (english)

In this work numerical modelling and analysis of heat transfer and water flow in solar storage tank was performed. Dynamic simulations of the tank in operating and heating mode for selected time of day, were carried out in computer software ANSYS Fluent. Capacity of stoarge tank is 283,7 l. Thermal output of heat exchanger for solar water heating and output of auxilliary heat exchanger were adapted for selected solar heating system, daily consumption of domestic hot water and required heating energy for space heating. Special attention was given to analysis of influence of conduction and natural convection on thermal stratification of storage tank. Simulation results were compared to ones acquired by using norm prEN 15316-5:2021. In doing so, storage tank was divided into multiple volume parts. Finally, impact of results of simulations and ones obtained by the norm on thermal efficiency of solar collector in selected time frame was assesed.

• Keywords: solarni spremnik; ANSYS Fluent; prEN 15316-5:2021; slobodna konvekcija; provođenje
• Keywords (english): solar storage tank; ANSYS Fluent; prEN 15316-5:2021; natural convection; conduction
• Language: croatian
• URN:NBN: urn:nbn:hr:235:280191
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-05 11:57:49