China has built nuclear power plant main control room noise value agreed to 56dB (A) or so, after the noise control noise is 53dB (A) or so. However, according to relevant national standards, environmental noise limits for new projects main control room to achieve 45dB (A). Accordingly, the monitoring of operating nuclear power plants in the main control room noise, room sound field simulation and identify sound sources, found that: air HVAC system noise of the air distribution system to produce secondary duct itself radiated noise excitation is sound and solid the main source of indoor master acoustic environment. Studies have shown that: the main factors vent excessive noise muffler system design is unreasonable, the system calculation inaccurate flow noise, noise reduction equipment and system performance is not reasonable match and the lack of relevant engineering experience. In this paper, the problems identified, the system describes the different mechanisms produce noise with different noise reduction measures should be analyzed wind pipe itself radiated noise excitation and solid sound excessivecountermeasures, and from the HVAC system controls air distribution system starting noise, it made a similar noise reduction reference integrated HVAC systems solutions.%我国已建成的核电厂主控室内噪声值约定为56dB（A）左右，经噪声控制后噪声值为53dB（A）左右。但是根据有关国家标准的要求，新建项目主控室的环境噪声限值要达到45dB （A）。据此，监测在运行核电厂主控室内噪声，识别室内声场模拟及声源，发现：暖通空调系统之空气输配系统产生的风口噪声、风管本身辐射的二次激发噪声及固体声是主控室内声环境的最主要声源。研究表明：风口噪声超标主要因素有系统消声设计不合理，系统气流再生噪声计算不精确，消声设备性能与系统未合理匹配及缺乏相关工程经验等。本文针对问题，系统阐述了噪声不同产生机理应该采用不同降噪措施，分析了风管本身辐射的二次激发噪声及固体声超标解决对策，并从暖通空调空气输配系统控制噪声出发，提出了暖通空调系统综合降噪参考方案。
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