Diesel exhaust fumes

[Customer]

Hi, 

I'd like to model exhaust fumes from underground trucks and machines? Do I add the exhaust as fixed gas sources, or is there a better way?

[Martin Griffith]

Diesel engines can be added to a ventilation model as a Heat Source and will have an effect in both Heat Simulations and Diesel Simulations.

 A diesel engine will act as a heat source during a Heat Simulation, factoring in the engine efficiency (default value 35%). Therefore, a heat source of Diesel Engine 150 kW will produce 150 / 0.35 = 429 kW of heat. The diesel efficiency can be changed in Settings -> Heat -> Diesel Efficiency.

A Diesel Simulation will model throughout the mine, the concentration of diesel exhaust fumes and particulate matter coming from the diesel engines. The emission yield rates of CO, NOx and DPM (diesel particulate matter) will be set from the values in Settings -> Diesel. However, engine emissions can vary from engine to engine, so you may wish to enter in different emission rates for different engines.

To use different yield rates for different engines, you need to define the diesel engines in the Presets, under the Heat, Moisture, Diesel tab. When you set a diesel engine, you have the option of leaving the yield rate blank, in which case Ventsim will use the values in Settings -> Diesel. Alternatively, you can provide a yield rate per engine.

The emissions rates for diesel engines are often available from the engine manufacturer, or at least the EU or US EPA standard to which the engine is rated against is given.