The finite element method is utilized to predict the insertion loss of plenums. Insertion loss is determined by comparing the transmitted sound power at the termination with and without a plenum inserted into the duct system. The boundary condition for the duct system on the source side is a diffuse or reverberant field, and a baffled termination is assumed. Simulation results are compared to published measurement results for HVAC plenums with good agreement. Additionally, the results are compared to the ASHRAE Handbook equations and a well-known energy based model. The approach is appropriate both above the plane wave cutoff frequency and at frequencies just below the cutoff, and is demonstrably superior to the Handbook.
Citation: ASHRAE Conference Papers, Dallas, TX.
Product Details
- Published:
- 2013
- Number of Pages:
- 8
- File Size:
- 1 file , 620 KB
- Product Code(s):
- D-DA-13-C024
