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undergraduate thesis
Kaskadni rashladni sustavi
2020. urn:nbn:hr:162:733971
Zdrilić, Filip
University of Zadar
Maritime Department
Division of Maritime Engineering

Cite this document

Zdrilić, F. (2020). Kaskadni rashladni sustavi (Undergraduate thesis). Zadar: University of Zadar. Retrieved from https://urn.nsk.hr/urn:nbn:hr:162:733971

Zdrilić, Filip. "Kaskadni rashladni sustavi." Undergraduate thesis, University of Zadar, 2020. https://urn.nsk.hr/urn:nbn:hr:162:733971

Zdrilić, Filip. "Kaskadni rashladni sustavi." Undergraduate thesis, University of Zadar, 2020. https://urn.nsk.hr/urn:nbn:hr:162:733971

Zdrilić, F. (2020). 'Kaskadni rashladni sustavi', Undergraduate thesis, University of Zadar, accessed 06 April 2025, https://urn.nsk.hr/urn:nbn:hr:162:733971

Zdrilić F. Kaskadni rashladni sustavi [Undergraduate thesis]. Zadar: University of Zadar; 2020 [cited 2025 April 06] Available at: https://urn.nsk.hr/urn:nbn:hr:162:733971

F. Zdrilić, "Kaskadni rashladni sustavi", Undergraduate thesis, University of Zadar, Zadar, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:162:733971

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Metadata
TitleKaskadni rashladni sustavi
Title (english)Cascade refrigeration system
AuthorFilip Zdrilić
MentorIvica Glavan (mentor)
Committee memberIvan Gospić (predsjednik povjerenstva)
Committee memberIvica Glavan (član povjerenstva)
Committee memberMarijan Gržan (član povjerenstva)
GranterUniversity of Zadar
(Maritime Department)
(Division of Maritime Engineering)
Zadar
Defense date and country2020-07-17, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Traffic and Transport Technology
Maritime and River Traffic
Abstract
Rad se temelji na opisu kaskadnih rashladnih sustava koji su počeli sve više privlaćiti pažnju u rashladnoj industriji, pogotovo u područjima koja zahtjevaju vrlo niske temperature isparavanja. Nalaze široku primjenu kod velikih lanaca supermarketa, brzo smrzavanje prerađene hrane, duboko industrijsko hlađenje, ukapljivanje prirodnog plina(LNG), ukapljivanje naftnog plina(LPG). Svi ti navedeni rashladni procesi zahtjevaju relativno niske temperature hlađenja koja se kreću u granicama (-30°C do... More -180°C) pri temperaturi okoline oko 20°C. Jasno je da zbog ogromnih temperaturnih razlika je nemoguće izvesti s jednostupanjskim rashladnim procesom, iz razloga što bi kroz kompresor zahtjevalo vrlo visoke kompresijske omjere. U tekstu se najviše pozornosti posvetilo kaskadnim rashladnim sustavima koji kao radne tvari upotrebljavaju CO2/NH3, zbog svojih termodinamičkih i fizikalnih karakteristika ostvaruju najveći COP cjelokupnog sustava u odnosu na druge kombinacije. Uglavnom se CO2 ne mjenja, već u visokotemperaturnom krugu osim amonijaka možemo odabrati neko drugo rashladno sredstvo kao R-410A ili R-134a. Također, prikazano je grafički utjecaj različitih radnih parametara na cjelokupni COP te optimalna temperatura kondenzacije kaskadnog izmjenjivača topline kaskadnog rashladnog sustava CO2/NH3. Na kraju je detaljno opisan kaskadni rashladni sustav za ponovno ukapljivanje plinskog otparka(BOG). Less
Abstract (english)
The paper is based on description of cascade refrigeration systems which are attracting more and more attention in the refrigeration industry, and especially in fields that require very low temperatures. They have wide application like large supermarket chains, rapid freezing of processed food, deep industrial refrigeration, liquefaction of natural gas (LNG), liquefaction of petroleum gas (LPG). All these refrigeration processes require moderately cold refrigeration temperatures in the range... More of (-30°C to -180°C) with ambient temperature near 20 ° C. This temperature range is too large for a single vapor-compression refrigeration cycle, because it requires a very large pressure ratio across the compressor. In the text, the most attention was paid to cascade refrigeration systems CO2 / NH3 as working substances, due to their good thermodynamic and physical characteristics, they achieve the highest COP of the overall system, compared with other combinations of refrigerants. Usually, CO2 is never replaced, but in a high-temperature circuit ammonia can be replaced with R-410A or R-134a. Also, graphicly is presented the influence of different operating parameters on the overall COP and the optimal condensation temperature of the cascade heat exchanger of the cascade refrigeration system CO2 / NH3 system. Finally, in detail is described cascade refrigeration system(R-1150-R-1270) for reliquefaction of boil of gas (BOG). Less
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:162:733971
Study programmeTitle: Naval Mechanical Engineering and Maritime Industry Technology
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka brodostrojarstva i tehnologije pomorskog prometa (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka brodostrojarstva i tehnologije pomorskog prometa)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2020-08-18 12:47:18
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