| Title |
Analysis on Cross-contamination between Outside Fresh Air Inlet and Exhaust Opening of Heat Exchanger in Apartment House |
| Authors |
금하영(Kum, Ha-Yeong) ; 손유라(Son, Yu-Ra) ; 양정훈(Yang, Jeong-Hoon) |
| DOI |
https://doi.org/10.5659/JAIK.2021.37.5.141 |
| Keywords |
CFD; Total Heat Exchanger; Ventilation cap; Out side Fresh Ait Inlet; Exhaust vent |
| Abstract |
The purpose of this study is to analyze cross contamination between the outdoor fresh air inlet and exhaust of the heat exchanger in apartme
nt house using CFD. According to the current rules, the degree of cross-contamination according to the shape of the ventilation cap, external
wind speed, and wind direction installed was defined as the recirculation rate. As a result, the recirculation rate was up to 30% when a cap
of adverse wind prevention was used. In the case of using a round wall-mounted ventilation cap, the recirculation rate was low with less tha
n 10%. Both ventilation caps were analyzed to have a high recirculation rate from a specific area for each wind direction. In the case of the
frontal wind, the recirculation rate was high at both ends of the building, the center of the building in the case of the rear wind, and the ri
ght side of the building in the case of the lateral wind. According to CRP2 analysis, wind speeds (0.5 m/s, 1 m/s) that caused the most cro
ss-contamination are affected by air currents emitted from exhaust located just above not the outside airflow. In the improvement plan, the ef
fect was shown in the form of an exhaust vent protruding alone or both the outdoor fresh air inlet and exhaust protruding. Each confirmed a
reduction of up to 70 to 60 per cent. |