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Experimental study of a high-performance single-tube absorber for reduced ammonia inventory. 

Auteurs : SHEN T., LU D., CHEN R., GONG M.

Type d'article : Article de la RIF

Résumé

Ammonia-water absorption systems offer a promising pathway for energy conservation and environmental pro tection; however, their widespread application is strictly constrained by safety concerns regarding the toxicity and flammability of ammonia. Since the absorber typically accounts for approximately one-third of the total fluid inventory in these systems, reducing its charge without compromising performance is a critical challenge. While bubble absorbers are known for high mass transfer efficiency, existing designs often face trade-offs between com pactness and transfer performance, with limited research explicitly targeting charge reduction. To address this issue, a high-performance single-tube absorber featuring segmented gas injection and intensified cooling was designed and experimentally investigated. This novel configuration aims to minimize ammonia inventory while ensuring sufficient outlet concentration and heat rejection. Mechanistically, the segmented injection strategy enhances mass transfer by dispersing vapor into finer bubbles to increase the gas-liquid interfacial area, while the intensified cooling structure significantly reduces the thermal resistance path by positioning the coolant sur face closer to the absorption heat source (gas-liquid interface). A systematic parametric study was conducted to evaluate the effects of key structural and operating variables. Furthermore, dynamic visualization of bubble morphology was performed to provide qualitative evidence supporting the enhanced performance. Experimental results demonstrate that the proposed absorber achieves a heat removal rate per unit ammonia charge approx imately 2–3 times higher than those of conventional bubble and falling-film absorbers. This corresponds to an evident enhancement in heat removal performance per unit ammonia charge, indicating a potential for reducing the working-fluid inventory in practical absorber designs.

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Format PDF

Pages : 15

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  • Prix public

    20 €

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    Gratuit

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Détails

  • Titre original : Experimental study of a high-performance single-tube absorber for reduced ammonia inventory. 
  • Identifiant de la fiche : 30034963
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 188
  • Date d'édition : 08/2026
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2026.106975

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