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Optimization of NTUm allocation between dehumidifier and regenerator in liquid-desiccant air-conditioning system

Author(s) : GUAN B., LIU X., ZHANG T.

Type of article: IJR article

Summary

Heat and mass transfer capacities of dehumidifier and regenerator significantly affect the performance of a heat pump driven liquid desiccant air-conditioning (HPLDAC) system. When the dehumidifier and regenerator have the same air flow rates, an equal allocation of the total usable number of mass transfer units (NTUm) between the dehumidifier and regenerator is an intuitive choice. However, whether the equal allocation can result in the optimal system performance is still a pending question. Thus, the optimization principle of NTUm allocation between dehumidifier and regenerator in the HPLDAC system is theoretically deduced and illustrated in this study. The results reveal the equal allocation is recommended when the nonlinearity of the isoφ line is insignificant, whereas allocating more NTUm to the dehumidifier than regenerator is recommended when the nonlinearity of the isoφ line is significant. When the NTUm values of the dehumidifier and regenerator are large enough, further increases of the NTUm values show limited effect on performance improvements of the dehumidifier and regenerator. Only when the total NTUm is below 10, does the NTUm allocation optimization play an important role in the system performance improvement, and is a pre-estimation necessary for achieving the optimal system performance.

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Details

  • Original title: Optimization of NTUm allocation between dehumidifier and regenerator in liquid-desiccant air-conditioning system
  • Record ID : 30028339
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 127
  • Publication date: 2021/07
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.02.004

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