Analiza delovanja majhne parno-kompresijske hladilne naprave

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Mihael Blatnik (Author), Andrej Kitanovski (Mentor)

Abstract

Upravljanje s toploto postaja vse pomembnejše pri ohranjanju ustreznega delovanja in zanesljivosti elektronskih naprav, močnostne elektronike in različnih orodij v proizvodnji. Za obvladovanje vedno večje generacije toplote in doseganja visoke gostote moči je potreba po novih in učinkovitejših tehnikah hlajenja vse večja. V okviru te magistrske naloge smo se osredotočili na pregled razvoja hlajenja dimenzijsko majhnih virov toplote in pri tem razvili manjši parno-kompresijski sistem za hlajenje le-teh. V sistem je bil vgrajen eden najmanjših tržno dostopnih miniaturnih rotacijskih kompresorjev. Na eksperimentalni progi je bila izvedena več-parametrična analiza, kjer smo določili hladilno moč in hladilno število sistema, temperaturo uparjanja in najnižjo temperaturo, ki jo doseže hlajena voda. Rezultate smo primerjali glede na tri različne pretoke hlajene vode in tri različne notranje premere kapilar ter ugotovili, da zasnovani sistem pohladi vodo za 7 °C in pri tem doseže 255 W hladilne moči. Del analize hladilne naprave je obsegal tudi učinkovitost kompresorja, kateremu smo izračunali volumetrični in izentropni izkoristek ter jih primerjali z izkoristki, določenimi na podlagi tehničnega podatkovnega lista proizvajalca kompresorja. Izračunani izkoristki na podlagi eksperimentalnih rezultatov so nekoliko nižji, ker smo v sistemu uporabili hladivo R600a, medtem ko je proizvajalec pri testiranju kompresorja uporabil hladivo R134a.

Keywords

magistrske naloge;hlajenje elektronike;upravljanje s toploto;prenos toplote;parno-kompresijski sistem;kompresor;miniaturizacija;

Data

Language:	Slovenian
Year of publishing:	2023
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[M. Blatnik]
UDC:	536.2:621.56(043.2)
COBISS:	168078851
Views:	65
Downloads:	12
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Analysis of the operation of the small vapour-compression cooling device
Secondary abstract:	Heat management is becoming increasingly important in maintaining the proper operation and reliability of electronic devices, power electronics and various tools in production. To cope with the increasing heat generation and to achieve higher power densities, the need for new and more efficient cooling techniques is increasing. In the context of this MSc thesis, we have focused on reviewing the development of cooling of dimensionally small heat sources, and in doing so have developed a small-scale vapor-compression system for cooling them. The system incorporated one of the smallest commercially available miniature rotary compressors. A multi-parametric analysis was carried out on the experimental system to determine the cooling power and cooling number of the system, the evaporation temperature and the minimum temperature reached by the chilled water. The results were compared for three different chilled water flows and the different capillary internal diameters, and it was found that the designed system cooled the water by 7 °C, achieving 255 W of cooling power. Part of the analysis of the cooling system also included the efficiency of the compressor, for which volumetric and isentropic efficiencies were calculated and compared with efficiencies determined from the compressor manufacturer’s technical data sheet. The calculated efficiencies based on the experimental results are slightly lower because we used R600a refrigerant in the system, whereas the manufacturer used R134a refrigerant when testing the compressor.
Secondary keywords:	master thesis;electronics cooling;thermal management;heat transfer;vapour-compression system;compressor;miniaturization;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XXVI, 80 str.
ID:	19880132