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Given: Estimate the amount of infrared radiation required to evaporate 4 grams of water per square foot every 5 seconds from a substrate material in a water based adhesive application. Assume the substrate to have a negligible mass.

Calculations:

Convert the grams of water per square foot to lbs. of water per square inch:
(4 g/ft²)(.0022046 lb./g)( 1/144 ft²/in²) = 61.24 x 10^-6 lbs./in²

The power required to heat the water is given by:

   Watt-Hour            (Weight)(Specific Heat)( T₁ - T₂ )
^{_______________}   =    ^{__________________________________________}
          in²                                        3.412

                               (61.24 x 10^-6)(1.0)(212 - 65)
                               =    ^{______________________________________}    =  2.64 x 10^-3
                                                 3.412

                                                 (965 Btu/lb.)(61.24 x 10^-6 lbs./in²)
Latent Heat of Vaporization  =  ^{______________________________________}
                                                                    3.412

                                            = 17.32 x 10^-3

Total Power Required  =  (2.64 x 10^-3) + (17.32 x 10^-3)

                                                               Watt-Hour
                                    = 22.60 x 10^{-3      _____________}
                                                                       in²

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