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    Effects of temperature and humidity ratio on the performance of desiccant dehumidification system under low-temperature regeneration

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    Type
    Article
    Authors
    Yu, Hao cc
    Seo, Sang won
    Mikšík, František
    Thu, Kyaw
    Miyazaki, Takahiko
    Ng, Kim Choon cc
    KAUST Department
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Biological and Environmental Science and Engineering (BESE) Division
    KAUST Grant Number
    OSR-Cooling-2018-3988.3
    REP/1/3988-01-01
    Date
    2022-05-06
    Embargo End Date
    2023-05-06
    Permanent link to this record
    http://hdl.handle.net/10754/676665
    
    Metadata
    Show full item record
    Abstract
    The desiccant dehumidification system can separate the latent heat and sensible heat in the air-conditioning system and achieve energy savings by removing latent heat. Industrial waste heat and renewable energy could be utilized in desiccant dehumidification systems, where the desorption process can be performed below 70 °C. The vapor pressure and temperature of the regenerating air dictate the desorption process corresponding to the isotherm properties. This study has focused on the effects of various temperatures and humidity ratios of regeneration air on the performance of a desiccant dehumidifier using a polymer as an adsorbent. Experiments were performed using the regeneration air with the humidity ratios of 0.005 kg kg−1, 0.010 kg kg−1, 0.015 kg kg−1, and 0.020 kg kg−1, while the air temperatures were varied from 40 °C to 70 °C. The evaluation of this study employs the adsorption/desorption amount, average moisture removal capacity, and latent energy ratio (LER) of the regeneration process as key performance indexes. At the regeneration temperature of 68 °C, the peak desorption amount at the humidity ratio of 0.005 kg kg−1 and 0.010 kg kg−1 both reached 0.011 kg kg−1. The results indicated that the higher desorption temperature led to a higher desorption amount. Besides, with the increased desorption temperature, the average moisture removal capacity increases. In contrast, the high humidity ratio of regeneration air resulted in a weak dehumidification ability. Lower regeneration temperature was difficult to apply to regenerate the polymer-based desiccant under a high-humidity-ratio atmosphere. To attain a high LER, a lower humidity ratio of dry air and regeneration temperature was preferred. The regeneration air with a humidity ratio of 0.020 kg kg−1 is not suitable to apply in the dehumidification system in the temperature range of 40–70 °C.
    Citation
    Yu, H., Seo, S. won, Mikšík, F., Thu, K., Miyazaki, T., & Ng, K. C. (2022). Effects of temperature and humidity ratio on the performance of desiccant dehumidification system under low-temperature regeneration. Journal of Thermal Analysis and Calorimetry. https://doi.org/10.1007/s10973-022-11368-7
    Sponsors
    Supported by KAUST Cooling Initiative grant, REP/1/3988-01-01” and subaward OSR-Cooling-2018-3988.3. The first author wishes to thank the financial support from China Scholarship Council (CSC).
    Publisher
    Springer Science and Business Media LLC
    Journal
    Journal of Thermal Analysis and Calorimetry
    DOI
    10.1007/s10973-022-11368-7
    Additional Links
    https://link.springer.com/10.1007/s10973-022-11368-7
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10973-022-11368-7
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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