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Titolo:
Thermodynamic property variation of nonazeotropic refrigerant mixtures (NARMs) in the temperature gliding zone
Autore:
Chung, M; Bai, C;
Indirizzi:
Yeungnam Univ, Dept Mech Engn, Kyongsan 712749, South Korea Yeungnam UnivKyongsan South Korea 712749 , Kyongsan 712749, South Korea
Titolo Testata:
CHEMICAL ENGINEERING COMMUNICATIONS
, volume: 180, anno: 2000,
pagine: 1 - 17
SICI:
0098-6445(2000)180:<1:TPVONR>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Keywords:
NARMs; thermodynamic properties; phase change; alternative refrigerants; temperature gliding;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Chung, M Yeungnam Univ, Dept Mech Engn, 214-1 Daedong, Kyongsan 712749, South Korea Yeungnam Univ 214-1 Daedong Kyongsan South Korea 712749 th Korea
Citazione:
M. Chung e C. Bai, "Thermodynamic property variation of nonazeotropic refrigerant mixtures (NARMs) in the temperature gliding zone", CHEM ENG CO, 180, 2000, pp. 1-17

Abstract

The relations among enthalpy, temperature and quality of nonazeotropic refrigerant mixtures (NARMs) in the phase change region (temperature gliding region) are investigated to seek a possibility for linear approximations. Using REFPROP, a refrigerant property calculation package developed by MST, temperature-enthalpy, temperature-quality, quality-enthalpy relations are investigated for 4 binary and 15 ternary NARMs. Those 19 NARMs tested are themost promising alternative refrigerants for conventional CFC and HCFC refrigerants. A normalized enthalpy, which is a pseudo-quality in a sense, is defined based on the dew and bubble point enthalpies to compare with the conventional quality. The results show that the pseudo-quality and the conventional quality are almost identical independent of system pressure for all the NARMs tested while enthalpy-temperature and quality-temperature relations are diverse and highly pressure dependent depending on mixture combinations. The significance of the near-identical relation between the two qualities is that the easy-to-calculate pseudo-quality can replace quality in convective heat transfer coefficient representations.

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Documento generato il 24/11/20 alle ore 21:04:52