PFR Releases FRNC-5PC Version 9.3.0

On March 1, 2018, PFR Engineering released FRNC-5PC v9.3. Version 9.3 includes a number of enhancements, upgrades and new features. Following are some highlights:

  1. Introduced a new radiant model which includes refractory emissivity. Program will use a default emissivity of 0.8 or one input by the user.
  2. Changed the Peak Flux calculation to the second and third rows of Firebox and Shock coils. This will make them more accurate and less conservative for tube design.
  3. Added the option to input nominal pipe size. Based on the user input for this, the program will determine the average tube wall thickness to use.
  4. Added a new graphical output that shows the Flue Gas Temperature-Heat Duty curve with the Temperature-Heat Duty curve of each Convection Section coil below it. This flue gas-process temperature plot clearly identifies approach temperatures and pinch points.
  5. Added a new printout for firebox floor flux density. This firing rate density is a key variable in designing burner layouts and size of the firebox.
  6. Reduced the tolerances used to determine convergence in the various calculation loops. Thus, heat duties, bridgewall temperatures, etc. will be slightly more accurate.
  7. Changed the “Radiant Flux Multiplier” input from being a Peak flux to Average flux ratio to a direct multiplier to the radiant peak flux. In this capacity, the multiplier is essentially the same as the “Fl” parameter used by many engineers.
  8. Allowed negative values to be input for Stack or Convection damper resistances. This is a good way to simulate ID fans.

If you would like additional information about FRNC-5PC v9.3 or any of the other PFR Engineering software products, please email us at