The application of array silencer performance curve in subway tunnel ventilation system

The noise-reducing acoustic design and calculation of ventilation systems have always been a shortcoming for most Heating, Ventilating and Air Conditioning (HVAC) engineers, and it is of practical significance to find a simple and effective solution for HVAC engineers. The application of array muffler in Metro environmental control ventilation system has been more than 10 years, and has been widely accepted and well received. The array muffler has been continuously developed and improved in the past 10 years, and the group standard has been promulgated. The selection method not only retains the traditional method of determining the silencing spectrum of the muffler according to the fan spectrum so as to select the muffler, but also innovatively puts forward the performance curve generated according to the fan spectrum and the silencing characteristics of the array absorber. With the array muffler, the number of rows and rows of sound absorbers can be adjusted freely and flexibly. After the sound source is determined, HVAC engineers only need to flexibly select different lengths on the muffler performance curve according to the silencing requirements, and make trade-offs according to the relationship between length, silencing effect and total pressure loss coefficient. This paper introduced the application method of array muffler performance curve and the method of adjusting the number of rows and columns of array muffler to meet different silencing requirements. If the technical conditions of the project change, the array muffler can select a more economical scheme through the flexible adjustment of the number of rows and rows of sound absorbers. Popularizing the use of array muffler in Metro environmental control ventilation system and promoting the use of performance curve for selection and optimization can not only greatly reduce the workload of HVAC engineers, but also further optimize the schemes according to the conditions after implementation. Under the premise of achieving the noise reduction goal, selecting the mode with the lowest ventilation resistance is conducive to energy conservation and carbon reduction, which is of great significance. © 2022, Central South University Press. All rights reserved.