Razvoj dinamičkog modela brodskoga rashladnog sustava s nadziranom atmosferom

doctoral thesis

• Title (english): Development of dynamic model of ship's refrigeration system with controlled atmosphere
• Author: Matko Bupić
• Mentor: Tonko Ćurko (mentor)
• Committee member: Antun Galović (predsjednik povjerenstva)
• Committee member: Tonko Ćurko (član povjerenstva)
• Committee member: Branimir Pavković (član povjerenstva)
• Committee member: Želimir Parat (član povjerenstva)
• Committee member: Luko Milić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2012-07-17, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering
• Universal decimal classification (UDC): 621 - Mechanical engineering. Nuclear technology. Machinery ; 629.5 - Watercraft engineering ; 51 - Mathematics

Abstract

U disertaciji je razvijen i opisan dinamički model brodskoga rashladnog sustava s nadziranom atmosferom koji omogućuje simulaciju njegova dinamičkog ponašanja. Za modeliranje i simulaciju koristilo se metodom sistemske dinamike i simulacijskim programom Powersim. S obzirom na to da je brodski rashladni sustav s nadziranom atmosferom složeni dinamički sustav, promatran je i analiziran s pomoću jednostavnijih podsustava koji su kreirani tako da čine njegove komponente. Razvijeni su posebni matematički modeli pojedinih podsustava: brodske skladišne stijenke, hlađenoga vlažnog zraka u skladištu, hlađenog tereta, opreme brodskoga rashladnog skladišta, hladnjaka zraka, ventilatora hladnjaka zraka, sustava razvoda rasola, isparivača rashladnika rasola i kondenzacijske jedinice rashladnika rasola, a potom i modeli: izmjene plinova respiracijom voća i povrća, oslobađanja topline respiracijom, oslobađanja vlage transpiracijom i model CA uređaja. Matematički modeli, koji su s usredotočenim parametrima, zasnovani su na bilancama masa, energija i količina gibanja. Za izradbu simulacijskog modela i testiranje njegove valjanosti koristilo se fizikalno-geometrijskim podatcima i postojećim eksperimentalnim rezultatima dobivenim na rashladnom sustavu konvencionalnog broda hladnjače "Lady Račišće". Računalnom simulacijom postignuti su rezultati koji omogućuju praktično sagledavanje dinamičkog ponašanja promatranog sustava, to jest analizu stanja zraka u skladištu, promjene temperature hlađenog tereta i praćenje međusobnog utjecaja pojedinih parametara. Dinamički model cjelokupnog sustava verificiran je temeljem usporedbe simulacijskih rezultata s postojećim eksperimentalnim rezultatima, pri čemu je ustanovljena dobra podudarnost. U radu je također dan opsežan pregled dosadašnjih istraživanja, opis tehnologije nadzirane atmosfere i njezin utjecaj na fiziološke procese u plodovima voća i povrća.

Abstract (english)

The dissertation has developed and described the dynamic model of ship's refrigeration system with controlled atmosphere, which enables the simulation of its dynamic behaviour. The method of System Dynamics and Powersim simulation programme have been used for modelling. Taking into consideration the fact that ship's refrigerated system with controlled atmosphere is a complex dynamic system, it has been studied and analysed through simpler subsystems which have been created on the key components. Special mathematical models of specific subsystems have been developed in the following way: ship's hold wall, refrigerated humid air in the hold, refrigerated cargo, equipment of ship's refrigerated hold, air cooler, fan of air cooler, brine system, evaporator of brine chiller and its condensation unit, and then the models of: gas exchange by respiration of fruit and vegetables, heat loads by respiration, moisture release by transpiration and CA device. The mathematical models, with concentrated parameters, have been based on the balances of masses, energy and the quantity of movement. Special physical and geometric data as well as experimental results obtained on refrigerated system of a conventional refrigerated vessel "Lady Račišće" have been used for production of simulation model and testing its validity. By means of computer simulation, the results have been achieved which enable practical analysis of dynamic behaviour of the system analysed i.e. the analysis of the air condition in the hold, changes of the temperature of the refrigerated cargo and analysis of the interaction of individual parameters. Dynamic model of the total system has been verified by means of the comparison of the simulation results with existing experimental results, being of considerable correspondence. The thesis has also given an exhaustive survey of recent published research in the area, the description of the CA technology and its influence on the physiological processes of fruits and vegetables.

• Keywords: dinamički model; matematičko modeliranje; računalna simulacija; brodski rashladni sustav; nadzirana atmosfera
• Keywords (english): dynamic model; mathematical modelling; computer simulation; ship's refrigeration system; controlled atmosphere
• Language: croatian
• URN:NBN: urn:nbn:hr:235:930912
• Study programme: Title: Mechanical Engineering and Naval Architecture; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-05-08 07:33:37