The current research looks at the thermodynamic performance analysis of an infrared suppression (IRS) system for warships, battleships, and ocean liners. ansys fluent 15.0 is used to solve governing differential equations (Navier–Stokes equation, energy equation, and equation of turbulence). The results are then used to produce a more detailed and accurate system model. Relevant parameters vary, such as the Reynolds number (6.12 × 105 to 3.11 × 106), louver pattern, the temperature of the nozzle inlet (400–600 K), and the different types of shapes of the nozzle. The effects of nozzle exhaust fluid temperature and different funnel wall conditions (adiabatic, diabatic with and without surface radiation) on heat transfer and entropy production are considered in various quantities. The entropy generation study helps justify the proposed design of the IRS system and select the best model among the proposed designs. Both the thermal and frictional irreversibility are plotted along with the Bejan number plots and the entropy generation contours to elucidate the thermofluid behavior.