The traditional R-22 and its substitute R410A were also investigated in a direct expansion geothermal system. Two hydrocarbon refrigerants, R290 and R600a were suggested to be implemented in a closed loop system to produce chilled water for air conditioning purposes. Varum, Singal, 2008, Review of mathematical modeling on latent heat thermal energy storage systems using phase-change material, Renewable Sustainable Energy Reviews, 12: 999–1031.This investigation focuses on the renewable geothermal energy source utilized as a reservoir for a water chiller unit in the cooling mode. Ist IIR Conference on Sustainability and the Cold Chain, Cambridge, UK. Wood, 2010, Novel design and performance of domestic refrigerators, Proc. Di Gregorio, 2003, Vacuum insulated panels (VIPs) technology: a viable route to reduce energy consumption in domestic, industrial and civil applications, available: articlesaesgetters.htm. Flick, 2004, Heat transfer by natural convection in domestic refrigerators, J Food Eng. Palagos, 2002, Study of domestic refrigerator temperature and analysis of factors affecting temperature: a French survey, Int. James, 2007, A review of the performance of domestic refrigerators, J. Klein, 2000, A semi-empirical method for representing domestic refrigerator/freezer compressor calorimeter test data, ASHRAE Transactions, 106. *** Intergovernmental Panel on Climate Change, 2005, Safeguarding the ozone layer and the global climate system, Cambridge University Press, New York, 462p.
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*** International Institute of Refrigeration, 2003, How to improve energy efficiency in refrigerating equipment, IIF/IIR, Paris, Available: en/doc/1015.pdf 2001, Refrigeration and air-conditioning – the response to climate change, Bulletin of the International Institute of Refrigeration, No 2001-5.
#COOLPACK DTU SOFTWARE#
*** Coolpack Software 2001, Denmark Technical University, Department of Mechanical Engineering, Available: UK/download.html Oliva, 2003, Three-dimensional numerical simulation of convection and radiation in a differentially heated cavity using the discrete ordinates method, Int. Flick, 2008, PIV measurement of the flow field in a domestic refrigerator model: Comparison with 3D simulations, Int. 2003, Developing new test procedures for domestic refrigerators: harmonisation issues and future R&D needs – a review, Int. Gobin, 2009, Enhancing the performance of household refrigerators with latent heat storage: an experimental investigation, Int. Solomon, 1993, Mathematical modelling of melting and freezing processes, Hemisphere Publishing, Washington, 336p.
Predviđena temperatura vazduha bila je iznad 5 ✬, pri čemu je možda potreban eutektičan fazno promenljivi materijal da bi se smanjila temperatura u odeljku hladnjaka Predviđene strujne slike i temperaturski profili prilično su se razlikovali za dva položaja fazno promenljivog materijala. CFD simulacija vazdušne struje i raspodele temperature u hladnjaku sa prirodnom konvekcijom je izvršena kako bi se odredio najbolji položaj za postavljanje fazno promenljivog materijala (na gornjem ili na zadnjem zidu). Autonomija hladnjaka je smanjena za 48%, kada je temperatura sredine povećana sa 20 ☌ na 43 ☌, a vreme zamrzavanje sa povećalo za 27% kada je temperatura isparavanja smanjena sa –10 ☌ na –15 ☌.
Rezultati pokazuju da se vreme topljenja i zamrzavanja povećalo proporcionalno sa debljinom fazno promenljivog materijala. Primenom numeričke metode ispitivan je uticaj tri parametra, a to su: debljina fazno promenljivog materijala (FPM), temperatura sredine i temperatura isparavanja.
Metoda entalpije je primenjena kako bi se ispitale brzina oslobađanja i akumulacija toplote inkapsuliranog leda. U ovom radu se ispituje uticaj dodavanja fazno promenljivog materijala u toplotnom kontaktu sa isparivačem u hladnjaku za domaćinstvo sa prirodnom konvekcijom.
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