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Salamander Ceramic Infrared Emitters Technical Manual Page 19

En Espaol

Water Evaporation Example (continued):

Warm-up Time:

                                Watt-Hour / in2
Warm-up Time =    __________________   x  60        Minutes
                                   Watt / in2

                       (22.6 x 10-3)
5/60 min. =   ________________   x  60
                          Watt / in2

Solve the "time" equation for Watt / in2:

                     (22.6 x 10-3)(60)
Watt / in2 =    __________________    =  16.27
                          (5/60 min)

The effective emissivity between two parallel plates is given by:

                    1                                      1
e =   __________________     =        ___________________
        ( 1/e1 + 1/e2 - 1)            ( 1/.9 + 1/.93 - 1)

   = .84


Stefan-Boltzmann Law:

R = (.84)(36.58072 x 10 -12 )( ( T1 )4 - ( T2 )4 ) = 16.27

Where:  T1 = Source Temperature
             T2 = Average Water Temperature = (65+212)/2 = 138.5 F (59 C)
                   = 332.5 K

Solve the equation for the source temperature.

wpe98728.gif (22968 bytes)

        = 858 K = 1084 F (584 C)

Results:
The surface temperature of the source must be at least 1084 F (584 C) to evaporate 4 grams of water within 5 seconds.

Page 18
Technical Manual Table of Contents
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