DuctSIM is a simulation program designed for both the mining and tunnelling industries to assist engineers and planners with the design and modelling of fan and duct systems. It provides a new user-friendly, cost-effective tool to quickly design, model, and analyze proposed or existing duct systems ranging from small secondary fan/duct installations to large series-fan systems.

According to input data, the user is able to construct models and optimize them by considering duct type and diameter, shock losses, and the number, type and spacing of fans. The program may be used for initial design, or to help troubleshoot and improve existing duct installations. It is useful in showing personnel the reasons behind a poor installation and ways to improve the system, resulting in safer working conditions. 

Applications and Uses

In any type of subsurface excavation, auxiliary ventilation systems represent a critical component of the overall ventilation scheme. Without adequate secondary ventilation it is impossible to provide sufficient air to dead-end headings, no matter what the quantity or quality of air at the duct inlet. In modern mining and tunneling, face ventilation problems are compounded by the large amounts of mechanized diesel equipment, and longer overall development. The increased use of diesel engines results in heat, gas and diesel particulate matter, and the generally deeper excavations leads to higher strata heat loads. A properly designed auxiliary ventilation system helps to alleviate these safety concerns.

DuctSIM allows engineers to visualize the auxiliary system, the airflow trend, and the pressure trend along the entire duct profile. This is extremely useful in identifying problem areas or leakage paths, and in properly locating fans based on the duct profile to maximize airflow where it is desired. Design an optimum system, or show managers or shifters where an installation is sub-standard and could be upgraded to improve working conditions.

Key Features

  • Data entry through dialogue boxes and/or table views.
  • Simple, straightforward duct entry dialogues follow a logical progression to set up the system. Select the length, duct diameter, duct material, resistance based on the construction or quality of duct installation, and set up "zones" based on transitions in the duct.
  • The Shock Loss dialogue box is completely automated - no need to look up coefficients or perform calculations. Options are given for selecting entries and exits, smooth elbows, elbow miters, dampers, screens, and fixed resistances.
  • Fan input allows the importation of fan curves from VnetPC fan file (.fdb) format, or standard table-style data input. Fan curve and operating point are plotted on the fan results view.
  • Complete design manual integrated with the program help files and user's manual. Includes formulas, shock loss coefficients, and the theory behind auxiliary system design, integrated with the complete explanation of program functions.
  • Graphical representations of the fan/duct system, flow and pressure profile, and fan curves.
  • Offered in dual units, Imperial and SI, including a conversion utility.
  • Printing of all input, results, and graphical views.


SRK North America