How to calculate the reduction in noise from an engine?

[Bhupinder1]

The exhaust gas from the engine is passed through, inlet duct, bundle of tubes, and outlet duct, in a smoke tube boiler. How can I calculate the reduction in noise level? Thanks.

 

[lilliput1]

Save yourself the trouble and possible blame. Put in the engine manufacturer recommended stock muffler. They can be mounted outdoors if there is no room indoor.

 

[Hoxton]

For gas engines with exhaust gas hear recovery we used to do precisely that. Ignore the noise reduction (if any) of the heat exchanger. For a start, getting a heat exchanger manufacturer to give the information, let alone a guarantee can be difficult.

Also, if the heat exchanger is removed, there needs to be no additional silencer.

At MW size of engine, the cost saving is marginal.