Optimizacija spajanja urbanih toplinskih izvora na postojeće centralizirane toplinske sustave

master's thesis

• Title (english): Optimisation of urban waste heat source integration into existing district heating systems
• Author: Kristijan Čuljak
• Mentor: Tomislav Pukšec (mentor)
• Committee member: Damir Dović (predsjednik povjerenstva)
• Committee member: Miro Hegedić (član povjerenstva)
• Committee member: Tomislav Pukšec (član povjerenstva)
• Committee member: Darko Smoljan (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-05-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

U diplomskom radu prikazan je jedan od načina spajanja urbanih izvora otpadne topline u centralizirane toplinske sustave (CTS). Prema literaturi postoji oko 1,2 EJ dostupne niskotemperaturne otpadne topline koja se ispušta u okoliš. Trenutne temperaturne razine CTS-a u Republici Hrvatskoj, ali i diljem Europe ne dozvoljavaju direktnu rekuperaciju otpadne topline. Zbog toga, ali i činjenice postojanja sve većeg udjela obnovljivih izvora energije u elektroenergetskom miksu, sve češće se za ovakvu integraciju otpadne topline upotrebljavaju dizalice topline. Integracija dizalica topline i izmjenjivača topline u smislu iskorištavanja otpadne topline, izrađena je pomoću modela pinch metode. Ona se zasniva na vrednovanju izmjene topline između dviju struja pomoću minimalne temperaturne razlike između njih. U radu je njen proračun potpomognut programskim jezikom Visual Basic for Applications (VBA) u sklopu računalnog paketa Microsoft Excela. Također, osim samog VBA, u radu je za potrebe mapiranja urbanih toplinskih izvora korišten i QGIS alat. Urbani toplinski izvori koji su mapirani jesu: rashladni uređaji supermarketa, sustavi hlađenja prostora trgovačkih centara i supermarketa te trafostanice. Pomoću pinch metode ispitani su uvjeti spajanja ovih izvora na tri različita temperaturna režima CTS-a. Njome je dobiven termodinamički uvid u mogućnosti spajanja: načini rekuperacije, vrijeme u godini kada ju je moguće rekuperirati ju te toplinski množitelj za svaki od objekata i scenarija. Pokazano je da su izvori topline rashladnih sustava supermarketa i trafostanica ekonomski i termodinamički izvedivi.

Abstract (english)

In this master thesis, the concept of urban waste heat sources was presented. In Europe, there is a huge potential for waste heat. Some approximations are cited about 1,2 EJ of waste heat available. The challenge is to integrate these sources to the newest generations of district heating networks. After a literature review, the method is represented with the model of every chosen urban heat source – supermarkets, shopping malls, and power substations. Integration of all these sources to the network was implemented with the pinch method. The pinch method was supported in Visual Basic for Applications (VBA) as one part of MS Excel. By implementing a pinch method, two ways of utilizing were implemented. First is the direct use with heat exchanger and second by using heat pumps. The results are thermodynamic and economic quantification of urban heat sources in different DH networks. The most economically feasible heat sources are refrigeration systems of supermarkets and power substations.

• Keywords: urbani izvori otpadne topline; pinch metoda; trafostanice; supermarketi; trgovački centri; CTS
• Keywords (english): urban heat sources; district heating; supermarkets; shopping malls; power substations
• Language: croatian
• URN:NBN: urn:nbn:hr:235:956589
• Project: Number: 857811; Title: Renewable and Waste Heat Recovery for Competitive District Heating and Cooling Networks; Acronym: REWARDHeat; Leader: Neven Duić; Jurisdiction: Italy; Funder: Europska komisija; Funding stream: Horizon2020
• 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: 2021-05-11 11:14:52