기체분리막 제습이 적용된 외기전담시스템의 에너지 성능 분석

Abstract

A vacuum membrane dehumidifier-assisted dedicated outdoor air system (VMD-DOAS) is proposed and its energy performance is investigated by detailed energy simulation. The dehumidification performance and operation energy consumption of the proposed system were compared with two conventional dedicated outdoor air systems; the DOAS assisted by the cooling coil (Reference A) and the DOAS with desiccant wheel (Reference B). The result shows that the average coefficient of performance of studied systems was 1.98 in the VMD-DOAS, 2.70 in Reference A, and 1.73 in Reference B and the average latent cooling ratio of studied systems was 1, 0.43, and 0.25, respectively. Although the coefficient of performance of the VMD is lower (or similar) than Reference cases, the energy consumption of the VMD could be reduced as its latent heat ratio (energy convergence ratio of total to latent energy for dehumidification) is higher than Reference cases. Also, reheating coil energy can be reduced by preventing the overcooling process as the isothermal dehumidification process of the VMD. The dehumidification energy consumption of the VMD was reduced. Consequently, the proposed system reduced the total annual operation energy by 40.5% compared with Reference B and by 21.8% compared with Reference A.