건물 기계실에서 발생하는 설비소음의 특성에 관한 연구

Abstract

Noise degree that happen in equipment device that is situated in building machine room has measured. Result that grasp noise source speciality and examine noise estimation standard are as following. Noise degree was measured by C characteristic and A characteristic. All Pass of equipment appliance appeared by each 67.7~102.7dB(C), 62.0~103.0dB(C). All Pass of measured transmission loss result in central unit appeared by each 54.2~72.8dB (C), 41.3~71.7dB(C). Noise degree of equipment appliance was evaluated by N value that propose in architectural institute of Japan. Emergency generator appeared most greatly by N-85, and electric transformer appeared as is smallest by N-60. In central unit transmission loss application result by N-40~N-70 appear. This exceeds architectural institute of Japan permission standard, can speak that countermeasure need. Noise degree of equipment appliance was evaluated by NR value that propose in ISO. Emergency generator appeared most greatly by NR-95, and electric transformer appeared as is smallest by NR-60. In central unit transmission loss application result by most NR-40 appear, and this is satisfying do acceptable level of large scale office. Noise degree evaluated by appliance NC curve. Refrigerating machine, Water supply pump, Emergency generator, Cooling tower appeared most greatly by NC-70. Air conditioner and electric transformer appeared as is smallest by NC-60. Can speak that countermeasure need transmission loss department in reply because exceed acceptable level of office by an application a result NC-30~NC-60 in center watch department. Above result can know that noise degree of equipment appliance is decided in most 1kHz frequency band. This is being expose by other result according to estimation method as well as exceed valuation basis of room noise. Therefore, noise of equipment appliance need to evaluate after choose suitable valuation basis. Specially, noise of equipment appliance that happen in machine room is judged that reduction countermeasure in 1kHz that is central frequency need.