RC MARK II - A REFINED PROCEDURE FOR RATING THE NOISE OF HEATING, VENTILATING, AND AIR-CONDITIONING (HVAC) SYSTEMS IN BUILDINGS

摘要

Since the introduction in 1981 of the RC procedure for rating heating, ventilating, and air-conditioning (HVAC) system-related noise in buildings, 16 years of practical experience in applying the methodology to develop a relationship between objective measurements and the subjective response of room occupants has shown that certain refinements are needed to improve the correlation, These refinements include a modification to the shape of the RC reference curves in the octave-band centered at 16 Hz, an improvement in the procedure for assessment of sound quality, and the development of a scale to estimate the magnitude of subjective response as a function of spectrum imbalance, The refined methodology discussed in this paper is based on these refinements, and is identified as the RC Mark II procedure for rating the noise of HVAC systems in buildings, The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) has adopted this refined methodology, and plans to recommend it as the preferred procedure for HVAC system sound rating in the next edition of the ASHRAE Applications Handbook to be published in 1999. (C) 1997 Institute of Noise Control Engineering. [References: 9]