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Document IIF

Effets de la mauvaise distribution de l'eau sur la stabilité d'un détendeur thermostatique et la performance de son évaporateur régulé à double circuit.

Effects of water mal-distribution on thermostatic-expansion-valve stability and its controlled two-circuit evaporator performance.

Auteurs : HUANG D., ZHAO R., GONG Q. Q., et al.

Type d'article : Article, Article de la RIF

Résumé

Effects of water mal-distribution on thermostatic-expansion-valve (TEV) stability and its controlled two-circuit evaporator performance were investigated experimentally and numerically. 7 sets of water mal-distribution were obtained with Circuit 2 water percentage (F2) from 36.9% to 9.1%. Results showed that the TEV control-loop was stable with F2 from 36.9% to 27.0%, and the overall evaporator capacity decreased by 3.4%. However, hunting occurred with F2 from 27.0% to 9.1% due to the evaporator outlet superheat smaller than the TEV minimal stable signal (MSS), hence system parameters such as evaporator pressures and temperatures oscillated over time. Hunting introduced a sharp decrease in the refrigerant flowrate to the evaporator, thus the overall evaporator capacity decreased by 14.1%. With water mal-distribution rate increased, the decrease in overall evaporator capacity was mainly attributed to Circuit 2 with smaller overall heat transfer coefficient.

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Format PDF

Pages : 38-47

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    20 €

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    Gratuit

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Détails

  • Titre original : Effects of water mal-distribution on thermostatic-expansion-valve stability and its controlled two-circuit evaporator performance.
  • Identifiant de la fiche : 30012597
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 48
  • Date d'édition : 12/2014

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