진공펌프 기체분리막을 이용한 제습증발냉각 외기전담시스템의 에너지 성능 평가

Abstract

This study proposes a vacuum membrane dehumidifier and evaporative cooling-based dedicated outdoor air system to estimate the energy performance by a simulation study. The annual energy consumption of the proposed systems was compared with two Reference cases as conventional dedicated outdoor air systems; a DOAS with a desiccant wheel (Reference A) and a DOAS with a wet cooling coil (Reference B). The proposed DOAS deals with latent and sensible cooling separated by a vacuum-based membrane dehumidifier, which dries air with an isothermal process. The result shows that the annual average coefficient of performance of studied systems was 3.34 in the proposed system, 2.35 in Reference A, and 2.43 in Reference B. In summer, the average coefficient of performance of studied systems was 2.79 in the proposed system, 0.59 in Reference A, and 0.86 in Reference B, which is 4.73 and 3.24 higher than Reference A and Reference B. Because the proposed system is a decoupled sensible and latent cooling system using vacuum-based membrane dehumidifier and free cooling system (evaporative cooling), it is not required a thermally unwanted cooling and heating process; regeneration heat in Reference A and overcooling then reheating process in Reference B. Consequently, the proposed system reduced the total annual operation energy by 72.0% compared with Reference A and by 39.3% compared with Reference B.