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undergraduate thesis
UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA
2020. urn:nbn:hr:153:201698
Dumenčić, Marko
Josip Juraj Strossmayer University of Osijek
Mechanical Engineering Faculty in Slavonski Brod

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Dumenčić, M. (2020). UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA (Undergraduate thesis). Slavonski Brod: Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod. Retrieved from https://urn.nsk.hr/urn:nbn:hr:153:201698

Dumenčić, Marko. "UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, 2020. https://urn.nsk.hr/urn:nbn:hr:153:201698

Dumenčić, Marko. "UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, 2020. https://urn.nsk.hr/urn:nbn:hr:153:201698

Dumenčić, M. (2020). 'UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, accessed 12 November 2024, https://urn.nsk.hr/urn:nbn:hr:153:201698

Dumenčić M. UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA [Undergraduate thesis]. Slavonski Brod: Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod; 2020 [cited 2024 November 12] Available at: https://urn.nsk.hr/urn:nbn:hr:153:201698

M. Dumenčić, "UTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, Slavonski Brod, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:153:201698

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Metadata
TitleUTJECAJ TLAKA ODVAJAČA KAPLJEVINE NA COP DVO-STUPANJSKOG KASKADNOG RASHLADNOG SUSTAVA
Title (english)EFFECT OF FLASH CHAMBER PRESSURE ON THE COP OF THE TWO-STAGE CASCADE REFRIGERATION SYSTEM
AuthorMarko Dumenčić
MentorMarija Živić (mentor)
Committee memberMarija Živić (član povjerenstva)
Committee memberMario Holik (član povjerenstva)
Committee memberAntun Barac (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Mechanical Engineering Faculty in Slavonski Brod
Slavonski Brod
Defense date and country2020-09-30, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
U ovom radu prikazan je proces rashladnog sustava, opisani su uređaji potrebni za rad te termodinamičke osnove na kojima ovaj proces radi. Zatim je predstavljen kaskadni rashladni sustav te je pojašnjen redoslijed operacija, kao i uređaji potrebni za rad. R134a zadana je kao početna radna tvar i za nju su iznesene osnovne karakteristike te je proveden proračun s ciljem određivanja optimalnog COP s obzirom na promjenu tlaka odvajača kapljevine te izentropskih stupnjeva djelovanja oba kompresora. Predložene su dvije nove radne tvar s obzirom na štetnost prema okolišu. Za R600a i R152a predstavljeni su rezultati koji su uspoređeni s R134a i predstavljena je odluka o boljoj zamjenskoj tvari na osnovi veličine faktora pretvorbe (COP). Proračun za R134a izvršen je ručno, kao i u EES-u (Engineering Equation Solver). Sve varijacije zadane u zadatku simulirane su u EES-u za sve navedene tvari, odakle su predstavljeni i dijagramski te tablični prikazi.
Abstract (english)
In this thesis a refrigeration process, necessary devices as well as thermodynamic laws supporting the process were presented. Next up, a two-stage cascade refrigeration cycle was described as well as devices necessary for the process to occur. The refrigerant R134a was set as the workiing fluid and its main data, as well as mathematical analysis were presented. Other than coefficient of performance (COP) influenced by changes in the pressure of the flash chamber, the isentropic efficiency of each compressor, first one at a time, then both together, was varied in order to show how COP changes as the isentropic coefficient changes. Two new refrigerants were suggested as possible replacements in order to decrease negative effects on the environment. Results for R600a and R152a were presented and compared to those for R134a and a conclusion was made which of the suggested refrigerants is the better replacement taking into account the COP of each of the refrigerants and choosing the optimal one. The analysis for R134a was done both by hand and in EES (Engineering Equation Solver). Every variation sought in the assignment was done in EES for each of the refrigerants where tables and diagrams were obtained from and compared to each other in order to find the better replacement.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:153:201698
Study programmeTitle: Undergraduate Study in Mechanical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2020-10-19 07:19:40