Projekt rashladnog sustava za skladištenje jabuka u kontroliranoj atmosferi

master's thesis

• Title (english): Design of a refrigeration system for storage of apples in controlled atmosphere
• Author: Ivana Gjuras
• Mentor: Marino Grozdek (mentor)
• Committee member: Hrvoje Jasak (predsjednik povjerenstva)
• Committee member: Marino Grozdek (član povjerenstva)
• Committee member: Tea Žakula (član povjerenstva)
• Committee member: Damir Dović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-04-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

Ovaj diplomski rad prikazuje projektiranje sustava hlađenja 18 ULO (engl. Ultra Low Qxygen) hladionica za skladištenje jabuka na duži vremenski period. Objekt se nalazi u kontinentalnoj Hrvatskoj i kapacitiran je za 3000 tone. Rashladni sustav je projektrian za transkritično područje rada s paralelnom kompresijom na R744. Hladionice se hlade indirektno s 38%-tnom mješavinom propilen glikola i vode.
Ukratko je opisana teorija zrenja i dozrijevanja voća, kao i ULO tehnologija hlađenja. Opisana su svojstva CO2 kao radne tvari i karakteristike sustava na R744. Prikazan je proračun toplinskog opterećenja kao i termodinamički proračun procesa. Osim toga, prikazan je postupak dimenzioniranja i odabira osnovnih komponenti i cjevovoda. Konačno, prikazana je shema spajanja i automatske regulacije kao i dispozicijski crtež strojarnice.

Abstract (english)

This master’s thesis presents the process of designing a refrigeration system for 18 ULO (Ultra Low Oxygen) cold rooms for storing apples for an extended period. The cooling plant is located in continental Croatia and has a capacity of 3000 tonnes. The refrigeration system is designed for a transcritical regime with parallel compression with R744. The cold rooms are cooled indirectly with a 38% mixture of propylene glycol and water.
It is briefly described the theory of fruit ripening, as well as ULO technology for cooling. The properties of CO2 as a refrigerant and the characteristic of systems with R744 are presented. The thesis contains a calculation of heat load and of the thermodynamic process. The dimensioning process and selection of essential components and pipelines are shown as well. The end of the thesis provides a connection diagram, diagram of automatic control and a disposition drawing of the machine room.

• Keywords: ULO hladionice; CO2 (R744); transkritični sustav; indirektno hlađenje
• Keywords (english): ULO cold room; CO2 (R744); transcritical system; indirect cooling
• Language: croatian
• URN:NBN: urn:nbn:hr:235:146479
• 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: 2020-04-04 12:40:16