Naslov
Transfer from Carnot to Lorenz Process Using Zeotropic Mixtures

Autori
Soldo, Vladimir ; Ćurko, Tonko ; Grozdek, Marino

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Zero Leakage - Minimum charge - Efficient Systems for Refrigeration, Air Conditioning and Heat Pumps / - Stockholm : International Institute of Refrigeration, 2002

Skup
Zero Leakage-Minimum Charge, IIR/IIF, Stockholm, Sweden, 2002.

Mjesto i datum
Stockholm, Švedska, 26.08.2002. - 28.08.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
zeotropic mixtures; Lorenz process; thermodynamic efficiency

Sažetak
The paper refers to the thermodynamic efficiency of the left hand cooling-heating process operating with a zeotropic mixture R407C that is compared to the process operating with a pure refrigerant R22. The measurements are performed on the experimental refrigerating system that enables operation according to Lorenz (zeotropic mixture application) and Carnot process (pure refrigerant application). The zeotropic mixture, during evaporation or condensation, changes temperature and there is a possibility to match temperature change with temperature decrease of a cooled medium in the evaporator, and temperature increase of the cooling water in the condenser. But, this is possible only in the counterflow heat exchangers. Obtained results show that the refrigerant R407C is a good substitute for the refrigerant R22 at higher evaporation temperatures. Although theoretical analysis has led to the assumption that R407C will increase efficiency compared to R22, the experimental results did not confirm it. The reasons are lower heat transfer coefficients in the process when refrigerant R407C is used.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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