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Développement et validation d'un estimateur de niveau de liquide d'accumulateur pour permettre une surchauffe nulle et une régulation active de charge dans les systèmes à compression de vapeur.

Development and validation of an accumulator liquid-level estimator to enable zero-superheat and active charge control in vapor-compression systems.

Numéro : 2450

Auteurs : LIU H., CAI J.

Résumé

Accumulators are commonly used to intercept liquid refrigerant before it reaches the compressor and can also be used as a refrigerant reservoir to assist active charge management. For zero-superheat and active charge control, accurate measurement or estimation of the accumulator liquid level is required. This paper presents an accumulator liquid level estimation approach based on a nonlinear state observer combined with a gray-box dynamic model of the evaporator and accumulator. This approach affords virtual detection of the liquid level in real-time from refrigerant pressure and temperature measurements, which are readily available in modern vapor-compression systems, and supports zerosuperheat and dynamic charge control to maximize system efficiency. Both numerical and experimental tests of the proposed liquid level estimation and charge control strategies were carried out with a 3-ton variable-speed heat pump. The tests have demonstrated the accuracy of the accumulator liquid level estimator and shown that the zero-superheat and active charge control strategy could improve the system efficiency by up to 10.5%.

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Pages : 10 p.

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Détails

  • Titre original : Development and validation of an accumulator liquid-level estimator to enable zero-superheat and active charge control in vapor-compression systems.
  • Identifiant de la fiche : 30030731
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 2022

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