HVAC暖通空调外文文献.pdf

Measuring Sound Power in Ducted Heating, Ventilating, and Air-conditioning . (HVAC) Systems for Use in Verifying Acoustical Prediction Methods d e v r e s e Steven R. Ryherd and Lily M. Wang r s t h g i r l Architectural Engineering Program, University of Nebraska—Lincoln, PKI, 1110 S. l a ; y 67th St., Omaha, NE 68182; PH (402) 554-2065; FAX (402) 554-2080; email: l n o e sryherd@mail.unomaha.edu s u l a n o s r e p r Abstract o F . E C S This paper discusses issues regarding in-situ methods of obtaining sound A t h power at a point in a heating, ventilating and air-conditioning (HVAC) duct system. g i r y Such a method is being used as part of a larger investigation on acoustical prediction p o C 3. methods to allow for comparison of measured data to results from attenuation 1 / 6 predictions of individual duct elements, such as elbows or dampers. Sound 2 / 2 1 propagation in HVAC duct work is complex. Any measurements of sound energy in n o y the duct must address the characteristics of sound propagation in ducts, end g o l reflections, and air turbulence. Investigations are being conducted to understand the o n h c extents to which these acoustical issues affect measurement