Ekonomsko-tehnički aspekti geotermalnih dizalica topline

master's thesis

• Title (english): Technical and economical aspects of geothermal heat pumps
• Author: Tena Jurič
• Mentor: Zvonimir Glasnović (mentor)
• Committee member: Zvonimir Glasnović (predsjednik povjerenstva)
• Committee member: Ante Jukić (član povjerenstva)
• Committee member: Karmen Margeta (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-12-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Analysis, Synthesis and Management of Chemical Processes

Abstract

U radu su prikazani svi relevantni parametri tehnologije geotermalnih dizalica topline koja predstavlja značajni doprinos u postizanju energetske učinkoviti građevina. Sustav počiva na lijevokretnom Clausisus-Rankineovom ciklusu u kojem se toplina preuzima iz tla i predaje isparivaču. Sustav geotermalne dizalice topline sastoji od tri kruga: kruga izvora topline, kruga radnog medija i kruga ponora topline. U krugu izvora topline, radni medij izmjenjuje toplinu s optočnim medijem (voda, glikolna smjesa, i dr.) koji cirkulira kroz cijevi, pri čemu se optočni medij hladi. Posebna pažnja je posvećena optočnom mediju, kojem je potrebno dodati sredstvo protiv zamrzavanja (antifriz) kako ne bi došlo do stvaranje leda na vodenoj strani izmjenjivača. U krugu ponora topline, radnom mediju se odvodi toplina. Optočni medij je najčešće voda, a dodatak antifriza nije potreban budući da ovdje ne postoji opasnost od zamrzavanja. Osnovne komponente sustava su isparivač, kompresor, kondenzator i ekspanzijski ventil. U isparivaču se radnom mediju predaje toplina iz okoliša, pri čemu se on zagrijava i prelazi u plinovito stanje. U kompresoru se odvija povećanje temperature i tlaka radnog medija. Pri izlasku iz kompresora radni medij predaje toplinu optočnom mediju, nakon čega prolazi kroz ekspanzijski ventil. Radni medij niske temperature pri izlasku iz ekspanzijskog ventila protječe do isparivača, čime je završen jedan ciklus. Analizirane su ekonomsko-tehničke karakteristike sustava geotermalne dizalice topline. Sustav koji je analiziran je ugrađen u stambenoj zgradi „Agria“ koja je izgrađena 2009. g. na lokaciji Reisnerova 64, Osijek. Na kraju je dana analiza isplativosti primjene geotermalnih dizalica topline s tlom za grijanje poslovno-stambene zgrade „Agria“ u odnosu na konvencionalne sustave grijanja s kotlovima na tekuće i plinovito gorivo.

Abstract (english)

The main objectives of this study are all the relevant parameters of the geothermal heat pump technology, that represents a significant contribution to the achievement of an energy efficient building. The system rests on the left-handed Clausisus-Rankine circular cycle in which the heat is taken from the soil and delivered to the evaporator. The geothermal heat pump unit consists of three circuits: the heat source circuit, the working medium circuit, and the heat pumps circuit. In the heat source circuit, the working medium exchanges heat with the circulating medium (water, glycol mixture etc.), whereby the circulating medium is cooled. Particular attention is paid to the circulating medium, which requires the addition of a antifreeze to prevent ice formation on the water side of the exchanger. In the heat pump circuit, heat is extracted from the working medium. The circulating medium is most commonly water, and antifreeze additive is not needed since there is no risk of freezing. The basic components of the system are evaporator, compressor, condenser and expansion valve. In the evaporator, the working medium is fed by the heat from the environment, where it is heated and passed into the gaseous state. Compressor is used to increase the temperature and pressure of the working medium. At the output from the compressor, the working medium transmits the heat to the circulating medium, after which it passes through the expansion valve. The low temperature working medium at the output from the expansion valve flows to the evaporator, which completes a cycle. The economic and technical characteristics of the geothermal heat pumps system were analyzed. The system analyzed was built in a residential building "Agria", which was built in 2009 at Reisnerova 64, Osijek. Cost-benefit analysis of the application of ground source heat pump systems for business-residential building "Agria" is given by compering costs of such systems with those of conventional heating systems.

• Keywords: geotermalna dizalica topline; energetska učinkovitost; zgradarstvo; analiza isplativosti; radni medij
• Keywords (english): geothermal heat pumps; energy efficiency; building; cost-benefit analysis; working medium
• Language: croatian
• URN:NBN: urn:nbn:hr:149:165566
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-05-07 10:55:37