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Comparison of electrically-driven dehumidification technologies for separate sensible and latent cooling systems.

Number: 2429

Author(s) : ANANTHAKRISHNAN K., GOYAL A.

Summary

Sustainable dehumidification using liquid desiccants or vapor-selective membranes coupled with sensible cooling can significantly reduce the energy demand in buildings and the associated carbon emissions compared to conventional vapor compression systems. These systems also eliminate synthetic refrigerants with high global warming potential. However, the energy input for dehumidification technology must be accurately estimated. In this paper, we compare the performance of three dehumidification technologies using a first-principles-based system simulation. The modeled systems include a) a combined electrodialysis-thermal regeneration of liquid desiccant dehumidification (ED-LD) system, b) a vacuum membrane dehumidification (VMD) system, and c) a standard vapor compression system. A dew point evaporative cooler sensibly cools the air for ED-LD and VMD systems to supply air in the desired conditions. The simulation includes an overall mass transfer model of the ED-LD module coupled with a heat and mass transfer model of a liquid desiccant dehumidification system. For a design ambient temperature of 35°C and relative humidity of 40%, the baseline ED-LD and VMD systems increase the overall electrical energy requirement by 8.2% and ~130%, respectively, compared to a vapor compression system. Using the ED-LD model, we estimated the membrane sizes and found the limiting inlet LD concentration for dehumidification to be 31.4%. We present optimized ED membrane parameters, including osmotic permeability, diffusion permeability of salt, and conductivity of ion-exchange membranes for electrodialysis to achieve better energy savings than the conventional system. Compared to the vapor compression system, the optimized system configuration can reduce the cooling and dehumidification power requirement by up to 45.7%.

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  • Original title: Comparison of electrically-driven dehumidification technologies for separate sensible and latent cooling systems.
  • Record ID : 30033132
  • Languages: English
  • Subject: Environment
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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