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Thermodynamic analysis of cascade vacuum pump based membrane dehumidifier in air conditioning system.

Number: 2303

Author(s) : CHEON S.-Y., CHO H. J., LEE J. H., PARK S. H., JEONG J. W.

Summary

Dehumidification technologies in building air conditioning systems become more important as sensible load decreases with thermal improvements in passive systems (i.e., air tightness, insulation). An isothermal dehumidifier, which has a separate membrane and uses a vacuum pump to generate a partial vapor gradient between the membranes, can significantly reduce energy consumption because it only manages latent cooling, regardless of temperature fluctuations. A single vacuum pump-based membrane dehumidifier, on the other hand, has a low coefficient of performance (COP). This is because the vacuum pump has to work at a high compression ratio (over 101) to create a partial vapor pressure difference. In this study, we proposed a cascade vacuum pump-based membrane dehumidifier to reduce the isothermal dehumidifier's energy consumption. To reduce the vacuum pump's compression ratio, the system incorporates multiple vacuum pumps and heat exchangers. We made a thermodynamic model of the suggested system and tested how well it worked in terms of energy and dehumidification under different operating conditions, such as air flow and vacuum pumps, and membrane properties, such as permeance and selectivity. The result showed that the energy performance (i.e., COP) of the proposed system is 30% higher than the conventional membrane dehumidifier by reducing the compression ratio and improving heat rejection from vacuum pump operation.

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  • Original title: Thermodynamic analysis of cascade vacuum pump based membrane dehumidifier in air conditioning system.
  • Record ID : 30033184
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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