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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
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- 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.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/21 alle ore 11:20:45