| Title |
An Analysis of the Humidity Reduction of Ventilation System Using Centralized Exhaust Fan in Condensation Prevention |
| Authors |
Suin Lee ; Gyeong-Seok Choi ; Yong Jun Lee ; Hyun-Hwa Lee |
| DOI |
https://doi.org/10.6110/KJACR.2021.33.2.055 |
| Keywords |
결로; 하이브리드 환기; 공용배기 활용 환기 시스템; 자연환기; 전산유체역학 Condensation; Hybrid ventilation system; Ventilation system using centralized exhaust fan; Natural ventilation; Computational fluid dynamics |
| Abstract |
In order to prevent condensation, it is necessary to remove water vapor through ventilation. In this study, we proposed a hybrid ventilation system in which natural ventilation and cen-tralized exhaust fan (VCE) ventilation systems are linked, and then compared the air flow of the natural ventilation system and the VCE system using a Computational fluid dynamics (CFD) model. The possibility of condensation was analyzed according to the systems’ chang-es in temperature and relative humidity, and the temperature and the humidity of the ventila-tion systems were directly measured within apartment houses. The results revealed that the ventilation volume of the whole household measured at 0.15 ACH when the natural ventila-tion was applied, and 0.50 ACH when the VCE system was applied. The average indoor air temperature only decreased by 1℃ when VCE was applied, indicating a very slight differ-ence when compared to the natural ventilation system. In addition, the result of analyzing the relative humidity distribution shows that the local relative humidity exceeded 100%, and that condensation conditions were formed when the natural ventilation system was applied. How-ever, the relative humidity distribution was even, and less than 100%, when the VCE system was applied, indicating a low probability of condensation. The results of analyzing the dif-ferences in average indoor air temperature with the VCE system shows that the air tempera-ture was measured to be 1.9℃ lower in the living room, and 2.27℃ lower in the laundry room, the balcony, and the evacuation space, than the air temperatures achieved with the nat-ural ventilation system. As a result of measuring the levels of absolute humidity, the average absolute humidity with the shared exhaust ventilation system was lower by 44.56% in the liv-ing room, the laundry room, and the evacuation space, when compared to the humidity of the natural ventilation opening case. Therefore, the results revealed that the humidity reduction performance was improved when the shared exhaust ventilation system was applied, when compared to the natural ventilation system, which could be effective in the prevention of condensation. |