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Review of liquid desiccant air dehumidification systems coupled with heat pump: system configurations, component designs, and performance.

Number: 2310

Author(s) : VENEGAS T., QU M., WANG L., LIU X.

Summary

A liquid-desiccant (LD) air dehumidification removes moisture in the air through an absorption process. It does not need to cool the process air down to the dew point temperature as in conventional vapor compression refrigeration (VCR) systems. The LD dehumidification (LDD) system can be combined with a sensible cooling system to control the temperature and humidity of an indoor environment independently. The LDD system requires heating for regenerating the diluted LD (i.e., removing the absorbed water vapor from the LD). Earlier LD dehumidification systems require a high concentration of LD for dehumidification and a high-temperature heat source for regeneration, commonly above 60°C. Electric resistance heaters or combustion-based regenerators were used to reach the required regeneration temperatures. An alternative approach has emerged in recent years, which uses a heat pump to provide both the cooling and heating needed for dehumidification and regeneration. Thus, the heat-pump-driven LDD (abbreviated as HP-LDD) can operate the dehumidification and regeneration at a lower temperature and concentrations than the conventional LDD system without any additional heat resources, resulting in higher system efficiency than the conventional dehumidification systems using VCR.
The paper reviews the working principle of the HP-LDD systems and the requirements of the dehumidification and regeneration processes. The advantages of the HP-LDD systems over the conventional LDD systems and the VCR-based air-conditioning systems are also discussed. Then, recent studies of the HP-LDD systems are reviewed to provide a comprehensive comparison and in-depth analysis of system configuration, component design, energy efficiency, and dehumidification performance. LD selection, heat pump integration, and needed controls for the HP-LDD systems are also discussed. Finally, an outlook is presented for future research to overcome the identified limitations and improve system performance.

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Pages: 10 p.

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Details

  • Original title: Review of liquid desiccant air dehumidification systems coupled with heat pump: system configurations, component designs, and performance.
  • Record ID : 30030654
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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