Analiza uporabe fazno spremenljivih snovi v gospodinjskem hladilno-zamrzovalnem aparatu

Heath, George Reuben (author), Klinar, Katja (mentor), Kitanovski, Andrej (comentor)

V magistrski nalogi smo obravnavali možnost izboljšanja energijske učinkovitosti gospodinjskega hladilno-zamrzovalnega aparata z uporabo fazno spremenljivih snovi (PCM). Razvili smo sistem za eksperimentalno analizo delovanja predelanega hladilno-zamrzovalnega aparata v realnih pogojih, pri čemer so bili PCM vgrajeni na več strateških mestih: med lamele uparjalnika, med uparjalnik in zadnjo steno zamrzovalnega prostora ter v vodilni kanal hladilnega zraka. Analizirali smo vpliv PCM s temperaturami faznega prehoda 2 $^°$C, 0 $^°$C, –21 $^°$C in –24 $^°C na delovanje aparata. Vgradnja PCM v uparjalnik je znižala hladilno moč sistema za 19,1 % in povečala razmerje med povprečnim časom vklopa kompresorja in celotnim ciklom (t. i. ON/OFF razmerje) za 4,35 %. S kombiniranim pristopom, pri katerem smo PCM vgradili na vsa tri strateška mesta, smo dosegli zmanjšanje povprečne hladilne moči za 58,2 % ter 84,78 % povečanje ON/OFF razmerja.

• Language: Slovenian
• Keywords: hladilno-zamrzovalni aparati, fazno spremenljive snovi, energijska učinkovitost, prenos toplote, kompresorji, uparjalniki
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2025
• Number of pages: XXII, 67 str.
• PID: 20.500.12556/RUL-171354
• UDC: 536.2:621.5.04:641.546.46(043.2)
• COBISS.SI-ID: 246891779
• Publication date in RUL: 23.08.2025

Secondary language

• Language: English
• Title: Analysis of the use of phase change materials in a household refrigerator

Abstract

In this master’s thesis, we investigated the potential for enhancing the energy efficiency of a household refrigerator-freezer by utilising phase change materials (PCMs). We developed a system for experimental analysis of the operation of a converted refrigerator-freezer under real conditions, with PCMs installed in several strategic locations: between the evaporator fins, between the evaporator and the rear wall of the freezer compartment, and in the cooling air guide channel. We analysed the impact of PCMs with phase transition temperatures of 2 $^°$C, 0 $^°$C, –21 $^°$C, and –24 $^°$Con the operation of the refrigerator. The installation of PCMs in the evaporator resulted in a 19.1 % reduction in the cooling capacity of the system and a 4.35 % increase in the ratio between the average compressor on-time and the full cycle (the so-called ON/OFF ratio). Using a combined approach, in which PCMs were installed in all three strategic locations, we achieved a 58.2 % reduction in the average cooling capacity and an 84.78 % increase in the ON/OFF ratio.

• Keywords: refrigeration and freezing appliances, phase change materials, energy efficiency, heat transfer, compressors, evaporators