| Title |
Evaluation of Air filter Performance in Building Air Conditioners through Field Measurements |
| Authors |
Jung Yong-Ho ; Park Byung-Yoon ; Sohn Jang-Yeul |
| Keywords |
Air Handling Unit ; Air filter ; Arrestance ; Pressure loss ; Microorganisms ; Maintenance guideline |
| Abstract |
In this study, arrestances, pressure losses and microorganisms were measured with digital dust indicators, a micro manometer and blood agar plates. The results of this study is as follows. Arrestance increased depending on whether the input of outdoor air was added. Pressure loss decreased depending on whether the input of outdoor air was added to AHUs which have built-out type return fans and vice versa in the built-in type. In contrast, the colony counts of microorganisms increased in the downstream of air filters. The rates of increase dropped depending on the addition of the input of OA. Arrestance increased, pressure loss decreased and the rates of increase of microorganisms dropped after washing out prefilters. Medium filter replacement is the main factor for arrestance, prefilter replacement or washing is the main factor for microorganisms but the range of fluctuation in differential pressure was hard to recognize as 1∼4mmAq. As for the results, proper maintenance??for air filters,??periodical washing out prefilters are important and development air filter performance test methods, standards or guidelines of dust concentration and microorganisms in AHUs are required. |