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Testing of a Falling-Film Evaporator for Adsorption Chillers

Author

Listed:
  • Tommaso Toppi

    (Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milan, Italy)

  • Tommaso Villa

    (Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milan, Italy)

  • Salvatore Vasta

    (CNR—ITAE, Consiglio Nazionale delle Ricerche-Istituto di Tecnologie Avanzate per l’Energia ‘‘Nicola Giordano’’, 98126 Messina, Italy)

  • Walter Mittelbach

    (Sorption Technologies GmbH, 79144 Freiburg, Germany)

  • Angelo Freni

    (CNR ICCOM—Consiglio Nazionale delle Ricerche Istituto di Chimica dei Composti Organometallici, 56124 Pisa, Italy)

Abstract

In this work, the performance of an innovative evaporator based on water falling film was investigated. The studied evaporator has been equipped with a recirculation system to maximise the wetted surface. Tests have been carried out in a lab-scale adsorption unit connected to a test bench recently realised at Politecnico di Milano labs for evaluating heat transfer performances under realistic operating conditions. Several ad/desorption cooling cycles were performed, setting different liquid refrigerant initial contents (0.9–1.5 kg), different chilled water inlet temperatures (7–20 °C) and flow rates (200–1000 L/h) and different adsorbent bed temperatures (25–30 °C). Evaporation performance has been determined in delivered cooling capacity. Moreover, the experimental data were used to calculate the overall evaporator heat transfer conductance (UA). Experiments showed how the heat duty peaks are mainly due to the thermal level of the chilled water that enters the evaporator, not the water content inside it because this value only affects the duration of the process. Instead, the UA value does not depend on the evaporator inlet chilled water temperature and initial mass content inside the evaporator. UA is 540–570 W/K for temperatures of chilled water entering the evaporator, equal to 10–20 °C, and mass of refrigerant of 0.9–1.5 kg.

Suggested Citation

  • Tommaso Toppi & Tommaso Villa & Salvatore Vasta & Walter Mittelbach & Angelo Freni, 2022. "Testing of a Falling-Film Evaporator for Adsorption Chillers," Energies, MDPI, vol. 15(5), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1709-:d:758110
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    References listed on IDEAS

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    1. Woo Su Lee & Moon Yong Park & Xuan Quang Duong & Ngoc Vi Cao & Jae Dong Chung, 2020. "Effects of Evaporator and Condenser in the Analysis of Adsorption Chillers," Energies, MDPI, vol. 13(8), pages 1-14, April.
    2. Thimmaiah, Poovanna Cheppudira & Sharafian, Amir & Rouhani, Mina & Huttema, Wendell & Bahrami, Majid, 2017. "Evaluation of low-pressure flooded evaporator performance for adsorption chillers," Energy, Elsevier, vol. 122(C), pages 144-158.
    3. Cheppudira Thimmaiah, Poovanna & Sharafian, Amir & Huttema, Wendell & McCague, Claire & Bahrami, Majid, 2016. "Effects of capillary-assisted tubes with different fin geometries on the performance of a low-operating pressure evaporator for adsorption cooling system applications," Applied Energy, Elsevier, vol. 171(C), pages 256-265.
    4. Volmer, Rahel & Eckert, Julia & Füldner, Gerrit & Schnabel, Lena, 2017. "Evaporator development for adsorption heat transformation devices – Influencing factors on non-stationary evaporation with tube-fin heat exchangers at sub-atmospheric pressure," Renewable Energy, Elsevier, vol. 110(C), pages 141-153.
    5. Li-Hua Yu & Shu-Xue Xu & Guo-Yuan Ma & Jun Wang, 2015. "Experimental Research on Water Boiling Heat Transfer on Horizontal Copper Rod Surface at Sub-Atmospheric Pressure," Energies, MDPI, vol. 8(9), pages 1-12, September.
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    Cited by:

    1. Salvatore Vasta, 2023. "Adsorption Air-Conditioning for Automotive Applications: A Critical Review," Energies, MDPI, vol. 16(14), pages 1-35, July.

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