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Title:Energetska učinkovitost variabilne hladilne naprave
Authors:ID Poberžnik, Aljaž (Author)
ID Iljaž, Jurij (Mentor) More about this mentor... New window
ID Marn, Jure (Comentor)
Files:.pdf UN_Poberznik_Aljaz_2025.pdf (2,69 MB)
MD5: 2E41D409FA5EE66BF49E6D392AF53B18
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Pojavlja se je vprašanje, kateri parametri vplivajo na učinkovitost delovanja hladilnika. V delu je najprej opisan princip delovanja hladilnika. V nadaljevanju je izveden analitični izračun hladilnega cikla. Z variiranjem je opazovan vpliv posameznih parametrov na eksergetsko razmerje in hladilno število. Rezultati so pokazali, da nižanje temperature hladilnika do temperature -15°C, kjer doseže vrednost 0,31, povečuje eksergijsko razmerje, nato to začne padati, pri 0°C ima vrednost 0,26. Višanje željenje temperature od -15°C navzgor, nima pozitivnega učinka na eksergijsko razmerje. Hkrati se čas delovanja podaljša, ob nižanju temperature v hladilnik, če želimo dosegati temperaturo -15°C namesto 0°C se čas hlajenja na dan skoraj podvoji Nižja temperaturna razlika med hladilnikom in temperaturo uparjanja privede do višje učinkovitosti, pri temperaturni razliki 4°C je vrednost hladilnega števila 5,75, med tem ko je pri temperaturni razliki 14°C vrednost 4,1.
Keywords:hladilna naprava, hladilno število, eksergijski izkoristek, izobutan R600a, analitični izračun
Place of publishing:Maribor
Publisher:[A. Poberžnik]
Year of publishing:2025
PID:20.500.12556/DKUM-94210 New window
UDC:621.56(043.2)
COBISS.SI-ID:21843 New window
Publication date in DKUM:25.09.2025
Views:140
Downloads:31
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:08.08.2025

Secondary language

Language:English
Title:Energy efficiency of variable cooling device
Abstract:The question arose as to which parameters affect the efficiency of the refrigerator. The work first describes the principle of operation of the refrigerator. Subsequently, a theoretical calculation of the refrigeration cycle is performed. By varying it, the influence of individual parameters on the exergy efficiency and the cooling number is observed. The results showed that lowering the refrigerator temperature to a temperature of -15°C, where it reaches a value of 0,31, increases the exergy ratio, then it starts to fall, at 0°C it has a value of 0,26. Increasing the desired temperature from -15°C upwards has no positive effect on the exergy ratio. At the same time, the operating time is extended, when lowering the temperature in the refrigerator, if we want to reach a temperature of -15°C instead of 0°C, the cooling time per day almost doubles. A lower temperature difference between the refrigerator and the evaporation temperature leads to higher efficiency, at a temperature difference of 4°C the value of the cooling factor is 5,75, while at a temperature difference of 14°C the value is 4,1.
Keywords:cooling device, cooling number, exergy efficiency, Isobutane R600a, theoretical calculation


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