Document IIF
Analyse comparative des performances thermodynamiques de transformateurs de chaleur à absorption à haute température en utilisant divers liquides ioniques comme couples de fluides actifs.
Comparative analysis of thermodynamic performance of high-temperature absorption heat transformers using various ionic liquids as working pairs.
Résumé
The study investigated six sets of ionic liquid (IL) working pairs based on high-temperature vapor-liquid equilibrium data. These sets were modeled using the NRTL activity coefficient model and integrated into a single-stage absorption heat transformer (AHT) for system cycle simulation analysis. A comparison was made with traditional H2O + LiBr working pairs commonly used in AHTs. The study aimed to assess the feasibility of using IL working pairs in high-temperature AHTs to achieve higher output temperatures when dealing with heat sources exceeding 120 °C. Compared to the traditional H2O + LiBr working pair, which has strong COP and ECOP but a limited temperature range, IL pairs offer advantages under various conditions. For instance, H2O + [HMIM][Cl] and H2O + [BMIM][Br] can operate at higher condensation temperatures, providing broader temperature ranges. H2O + [HMIM][Cl] has a wider operational temperature range, suitable for unstable waste heat sources. It also has the highest optimal ECOP value of 0.64 at 197 °C absorption temperature, and shows good cyclic performance, achieving temperature rises of about 78 °C. ILs can maintain stable COPs and circulation ratios over a wide range of absorption temperatures, thus achieving higher temperature rises or meeting the need for higher absorption temperatures. Notably, although the H2O + IL combination exhibits slightly higher exergy loss than the traditional H2O + LiBr pair when comparing exergy losses in the AHT system among different working pairs, its low corrosiveness, lack of crystallization, and wide operating temperature range make these drawbacks insignificant.
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Détails
- Titre original : Comparative analysis of thermodynamic performance of high-temperature absorption heat transformers using various ionic liquids as working pairs.
- Identifiant de la fiche : 30032487
- Langues : Anglais
- Sujet : Technologie
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 165
- Date d'édition : 09/2024
- DOI : http://dx.doi.org/10.1016/j.ijrefrig.2024.06.012
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Indexation
- Thèmes : Systèmes à absorption et adsorption
- Mots-clés : Comparaison; Liquide ionique; COP; Exergie; Système à absorption; Haute température; Eau-bromure de lithium; Modèle; Performance
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