IDEAS home Printed from https://ideas.repec.org/a/eee/appene/v112y2013icp93-101.html
   My bibliography  Save this article

Investigation on wetted area and film thickness for falling film liquid desiccant regeneration system

Author

Listed:
  • Qi, Ronghui
  • Lu, Lin
  • Yang, Hongxing
  • Qin, Fei

Abstract

The falling film liquid desiccant air conditioning system is promising to achieve a low pressure drop and low possibility of solution droplets carried by air. However, the insufficient wetted area was found by previous researchers, and its value is difficult to be determined. With a single channel internally heated regenerator, this paper experimentally investigated the influencing factors affecting the wetted area and film thickness, by obtaining the flow size with a thermal camera. The increasing wetted area could improve the mass transfer significantly while the performance decreased with the increasing film thickness of liquid desiccant. The thickness of solution distributor impacted the initial film width most greatly, and it also significantly influenced the film thickness and flow velocity. Under incomplete wetting conditions, the film width increased with the solution mass flow rate proportionally, and the change of the distribution of film thickness was found simultaneously. However, solution temperature and concentration contribute insignificantly, and the direct impact of air and water on wetted area was minor. A 3-D model was developed, for predicting the wetting factor, and film thickness and flow velocity of the falling film. The calculation results were compared with experiment ones with average errors of 8.74% and 9.76%. The newly developed model could significantly improve the accuracy of performance evaluation and simulation of liquid desiccant air conditioning systems.

Suggested Citation

  • Qi, Ronghui & Lu, Lin & Yang, Hongxing & Qin, Fei, 2013. "Investigation on wetted area and film thickness for falling film liquid desiccant regeneration system," Applied Energy, Elsevier, vol. 112(C), pages 93-101.
    • Handle: RePEc:eee:appene:v:112:y:2013:i:c:p:93-101
    DOI: 10.1016/j.apenergy.2013.05.083
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0306261913005060
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.apenergy.2013.05.083?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Mui, K.W. & Wong, L.T. & Law, L.Y., 2007. "An energy benchmarking model for ventilation systems of air-conditioned offices in subtropical climates," Applied Energy, Elsevier, vol. 84(1), pages 89-98, January.
    2. Audah, N. & Ghaddar, N. & Ghali, K., 2011. "Optimized solar-powered liquid desiccant system to supply building fresh water and cooling needs," Applied Energy, Elsevier, vol. 88(11), pages 3726-3736.
    3. Zhang, L.Z., 2006. "Energy performance of independent air dehumidification systems with energy recovery measures," Energy, Elsevier, vol. 31(8), pages 1228-1242.
    4. Chowdhury, Ashfaque Ahmed & Rasul, M.G. & Khan, M.M.K., 2008. "Thermal-comfort analysis and simulation for various low-energy cooling-technologies applied to an office building in a subtropical climate," Applied Energy, Elsevier, vol. 85(6), pages 449-462, June.
    5. Al-Sanea, Sami A. & Zedan, M.F., 2008. "Optimized monthly-fixed thermostat-setting scheme for maximum energy-savings and thermal comfort in air-conditioned spaces," Applied Energy, Elsevier, vol. 85(5), pages 326-346, May.
    6. Ge, Gaoming & Xiao, Fu & Xu, Xinhua, 2011. "Model-based optimal control of a dedicated outdoor air-chilled ceiling system using liquid desiccant and membrane-based total heat recovery," Applied Energy, Elsevier, vol. 88(11), pages 4180-4190.
    7. Xiao, Fu & Ge, Gaoming & Niu, Xiaofeng, 2011. "Control performance of a dedicated outdoor air system adopting liquid desiccant dehumidification," Applied Energy, Elsevier, vol. 88(1), pages 143-149, January.
    8. Eicker, Ursula & Schneider, Dietrich & Schumacher, Jürgen & Ge, Tianshu & Dai, Yanjun, 2010. "Operational experiences with solar air collector driven desiccant cooling systems," Applied Energy, Elsevier, vol. 87(12), pages 3735-3747, December.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Abdel-Salam, Mohamed R.H. & Fauchoux, Melanie & Ge, Gaoming & Besant, Robert W. & Simonson, Carey J., 2014. "Expected energy and economic benefits, and environmental impacts for liquid-to-air membrane energy exchangers (LAMEEs) in HVAC systems: A review," Applied Energy, Elsevier, vol. 127(C), pages 202-218.
    2. Angrisani, Giovanni & Roselli, Carlo & Sasso, Maurizio, 2015. "Experimental assessment of the energy performance of a hybrid desiccant cooling system and comparison with other air-conditioning technologies," Applied Energy, Elsevier, vol. 138(C), pages 533-545.
    3. Guo, Yi & Al-Jubainawi, Ali & Peng, Xueyuan, 2019. "Modelling and the feasibility study of a hybrid electrodialysis and thermal regeneration method for LiCl liquid desiccant dehumidification," Applied Energy, Elsevier, vol. 239(C), pages 1014-1036.
    4. Su, Wei & Lu, Zhifei & She, Xiaohui & Zhou, Junming & Wang, Feng & Sun, Bo & Zhang, Xiaosong, 2022. "Liquid desiccant regeneration for advanced air conditioning: A comprehensive review on desiccant materials, regenerators, systems and improvement technologies," Applied Energy, Elsevier, vol. 308(C).
    5. Lu, Hao & Lu, Lin & Luo, Yimo & Qi, Ronghui, 2016. "Investigation on the dynamic characteristics of the counter-current flow for liquid desiccant dehumidification," Energy, Elsevier, vol. 101(C), pages 229-238.
    6. Li, Xian & Liu, Shuai & Tan, Kok Kiong & Wang, Qing-Guo & Cai, Wen-Jian & Xie, Lihua, 2016. "Dynamic modeling of a liquid desiccant dehumidifier," Applied Energy, Elsevier, vol. 180(C), pages 435-445.
    7. Rambhad, Kishor S. & Walke, Pramod V. & Tidke, D.J., 2016. "Solid desiccant dehumidification and regeneration methods—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 73-83.
    8. Abdel-Salam, Ahmed H. & Simonson, Carey J., 2016. "State-of-the-art in liquid desiccant air conditioning equipment and systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 1152-1183.
    9. Yang, Hongxing & Shi, Wenchao & Chen, Yi & Min, Yunran, 2021. "Research development of indirect evaporative cooling technology: An updated review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).
    10. Duan, Zhongdi & Ren, Tao & Ding, Guoliang & Chen, Jie & Mi, Xiaoguang, 2017. "Liquid-migration based model for predicting the thermal performance of spiral wound heat exchanger for floating LNG," Applied Energy, Elsevier, vol. 206(C), pages 972-982.
    11. Mortazavi, Mehdi & Schmid, Michael & Moghaddam, Saeed, 2017. "Compact and efficient generator for low grade solar and waste heat driven absorption systems," Applied Energy, Elsevier, vol. 198(C), pages 173-179.
    12. Abdel-Salam, Ahmed H. & Simonson, Carey J., 2014. "Annual evaluation of energy, environmental and economic performances of a membrane liquid desiccant air conditioning system with/without ERV," Applied Energy, Elsevier, vol. 116(C), pages 134-148.
    13. Islam, M.R. & Alan, S.W.L. & Chua, K.J., 2018. "Studying the heat and mass transfer process of liquid desiccant for dehumidification and cooling," Applied Energy, Elsevier, vol. 221(C), pages 334-347.
    14. Zhang, Ning & Yin, Shao-You & Zhang, Li-Zhi, 2016. "Performance study of a heat pump driven and hollow fiber membrane-based two-stage liquid desiccant air dehumidification system," Applied Energy, Elsevier, vol. 179(C), pages 727-737.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Angrisani, Giovanni & Roselli, Carlo & Sasso, Maurizio, 2015. "Experimental assessment of the energy performance of a hybrid desiccant cooling system and comparison with other air-conditioning technologies," Applied Energy, Elsevier, vol. 138(C), pages 533-545.
    2. Ge, Gaoming & Xiao, Fu & Xu, Xinhua, 2011. "Model-based optimal control of a dedicated outdoor air-chilled ceiling system using liquid desiccant and membrane-based total heat recovery," Applied Energy, Elsevier, vol. 88(11), pages 4180-4190.
    3. Prieto, Alejandro & Knaack, Ulrich & Klein, Tillmann & Auer, Thomas, 2017. "25 Years of cooling research in office buildings: Review for the integration of cooling strategies into the building façade (1990–2014)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 71(C), pages 89-102.
    4. Wang, Xinli & Cai, Wenjian & Lu, Jiangang & Sun, Youxian & Ding, Xudong, 2013. "A hybrid dehumidifier model for real-time performance monitoring, control and optimization in liquid desiccant dehumidification system," Applied Energy, Elsevier, vol. 111(C), pages 449-455.
    5. Rambhad, Kishor S. & Walke, Pramod V. & Tidke, D.J., 2016. "Solid desiccant dehumidification and regeneration methods—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 73-83.
    6. Luo, Yimo & Shao, Shuangquan & Xu, Hongbo & Tian, Changqing & Yang, Hongxing, 2014. "Experimental and theoretical research of a fin-tube type internally-cooled liquid desiccant dehumidifier," Applied Energy, Elsevier, vol. 133(C), pages 127-134.
    7. Mohammad, Abdulrahman Th. & Mat, Sohif Bin & Sopian, K. & Al-abidi, Abduljalil A., 2016. "Review: Survey of the control strategy of liquid desiccant systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 250-258.
    8. Zhang, Zi-Yang & Cao, Xiang & Yang, Zhi & Shao, Liang-Liang & Zhang, Chun-Lu, 2019. "Modeling and experimental investigation of an advanced direct-expansion outdoor air dehumidification system," Applied Energy, Elsevier, vol. 242(C), pages 1600-1612.
    9. Li, Xian & Liu, Shuai & Tan, Kok Kiong & Wang, Qing-Guo & Cai, Wen-Jian & Xie, Lihua, 2016. "Dynamic modeling of a liquid desiccant dehumidifier," Applied Energy, Elsevier, vol. 180(C), pages 435-445.
    10. Abdel-Salam, Ahmed H. & Simonson, Carey J., 2014. "Annual evaluation of energy, environmental and economic performances of a membrane liquid desiccant air conditioning system with/without ERV," Applied Energy, Elsevier, vol. 116(C), pages 134-148.
    11. Min-Hwi Kim & Joon-Young Park & Jae-Weon Jeong, 2017. "Energy Saving Potential of a Thermoelectric Heat Pump-Assisted Liquid Desiccant System in a Dedicated Outdoor Air System," Energies, MDPI, vol. 10(9), pages 1-19, September.
    12. Zhang, Tao & Liu, Xiaohua & Jiang, Yi, 2014. "Development of temperature and humidity independent control (THIC) air-conditioning systems in China—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 29(C), pages 793-803.
    13. Zhang, Ning & Yin, Shao-You & Zhang, Li-Zhi, 2016. "Performance study of a heat pump driven and hollow fiber membrane-based two-stage liquid desiccant air dehumidification system," Applied Energy, Elsevier, vol. 179(C), pages 727-737.
    14. Sorrentino, Marco & Rizzo, Gianfranco & Genova, Fernando & Gaspardone, Marco, 2010. "A model for simulation and optimal energy management of Telecom switching plants," Applied Energy, Elsevier, vol. 87(1), pages 259-267, January.
    15. Angrisani, Giovanni & Roselli, Carlo & Sasso, Maurizio, 2013. "Effect of rotational speed on the performances of a desiccant wheel," Applied Energy, Elsevier, vol. 104(C), pages 268-275.
    16. Wang, Xinli & Cai, Wenjian & Yin, Xiaohong, 2017. "A global optimized operation strategy for energy savings in liquid desiccant air conditioning using self-adaptive differential evolutionary algorithm," Applied Energy, Elsevier, vol. 187(C), pages 410-423.
    17. Wu, Qiong & Cai, WenJian & Shen, Suping & Wang, Xinli & Ren, Haoren, 2017. "A regulation strategy of working concentration in the dehumidifier of liquid desiccant air conditioner," Applied Energy, Elsevier, vol. 202(C), pages 648-661.
    18. Jiang, Yuliang & Wang, Xinli & Zhao, Hongxia & Wang, Lei & Yin, Xiaohong & Jia, Lei, 2020. "Dynamic modeling and economic model predictive control of a liquid desiccant air conditioning," Applied Energy, Elsevier, vol. 259(C).
    19. Wang, Xinli & Cai, Wenjian & Lu, Jiangang & Sun, Youxian & Zhao, Lei, 2015. "Model-based optimization strategy of chiller driven liquid desiccant dehumidifier with genetic algorithm," Energy, Elsevier, vol. 82(C), pages 939-948.
    20. Shen, Suping & Cai, Wenjian & Wang, Xinli & Wu, Qiong & Yon, Haoren, 2016. "Hybrid model for heat recovery heat pipe system in Liquid Desiccant Dehumidification System," Applied Energy, Elsevier, vol. 182(C), pages 383-393.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:appene:v:112:y:2013:i:c:p:93-101. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/description#description .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.