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Impact de l’ajustement de la composition sur les performances d’une pompe à chaleur à haute température fonctionnant à l’eau et à l’ammoniac.

Impact of composition adjustment on the performance of a water-ammonia high-temperature heat pump.

Numéro : 2206

Auteurs : ABBASI S., VIEREN E., COUVREUR K., LECOMPTE S., ARTECONI A.

Résumé

High temperature heat pumps have been gaining significant interest in recent years for decarbonizing industrial energy processes and in more recent developments they have been shown to reach up to 200°C of delivery temperature. For such heat pumps, several potentially suitable refrigerants have been considered, among them zeotropic mixtures are particularly interesting owing to their characteristic temperature glide that can match the temperature profile of the heat sink and heat source. If the temperature glides with the source and sink can be set flexibly, the full potential of zeotropic mixtures can be exploited. A zeotropic water-ammonia mixture is considered in this analysis, given its significant potential in terms of thermodynamic performance and favorable environmental impact. In this work the effect of the mixture composition adjustment in the evaporator to increase the waste heat recovery is analyzed. A quasi-two stage vapor compression heat pump with the addition of a flash tank and a cascade condenser is considered. It separates the liquid and vapor phases of the outlet stream from the condenser with the aim of creating streams with different compositions. A part of the liquid outlet will be mixed with the vapor outlet to adjust the composition of the working fluid passing through the evaporator and the quality of the injection stream into the compressor. To investigate the performance of this modified system, a sensitivity analysis is performed to identify the optimal liquid split ratio, the flash tank pressure and injection pressure in terms of COP and heat recovery at the evaporator. It was observed that, compared to a non-modified quasi-two stage heat pump, the composition adjusted cycle achieves a COP gain of 14.02% and a 17.3% rise in evaporator heat gain.

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Détails

  • Titre original : Impact of composition adjustment on the performance of a water-ammonia high-temperature heat pump.
  • Identifiant de la fiche : 30033082
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 17/07/2024

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