NUMERICAL DATA FOR MICROWAVE
WATER HEATER
For a WR 340 heat transfer of height b with a liquid slab
of thickness e, ß or be/ß is the physical constant
which governs the microwave water heating process [4], [7] :
ß = 7.35 e 230 dB.° C/m = 1.690 e
dB.° C/mm = 0.194 e °C/mm where e is in mm.
be/ß = 222,5 mm3/°C
Using experimental data To and DT, the
values of z*, V* and Dz/z* can be deduced through
the data given in Figs.1 and 2 in conjunction with the above
formulae. d is a fraction
of the total temperature variation DT.
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Fig. 1
Approximate conjugate d ratio along the
length of the heat tranfer.
For d =
0.990
z* = 4.6 To/2ß, V* = 4.6 v = 4.6 beTo/2ß
For d =
0.999
z* = 6.9 To/2ß, V* = 6.9 v = 6.9 beTo/2ß
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z* in unit of To/2ß
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Fig. 2
d ratio
dependence on the relative error.
For d =
0.990
Dz/z* = DV/V* = 0.78 DT/To
For d =
0.999
Dz/z* =DV/V* = 0.85 DT/To
DT is related
to the process parameters with the formula :
DT ° C =
3.79 (KW required)/GPM
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Dz/z*
in unit of DT/To
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