mw heating data
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7/27/2019 MW Heating Data
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Process Modelling & Simulation 314, Semester 1, 2013
Microwave heating experimental data
Equipment and material information
Microwave oven power: 900 W (Nominal output at 100% power se
Fraction of power on HIGH: 100 %
Fraction of power on MEDIUM: 55 % (From equipment specification sheFraction of power on LOW: 10 % (From equipment specification she
Batch vessel diameter: 95 mm
Batch vessel height: 110 mm
Batch vessel mass: 80 g (Including lid, but without water)
Batch vessel material: polypropylene
Batch vessel heat capacity: 1800 J/(kg C) (Approximate value over 15-95C)
Process fluid: water
Operational notes
Process fluid temperature was measured by an infra-red (IR) thermometer from the outside of the bat
The IR thermometer was calibrated against a standard thermometer at about 55C by adjusting the e
The measurement error was approximately 3C.
The batch vessel was placed in the same position in the apparatus for each test.
The oven wall temperature was measured from time to time during the experiment; linear interpolati
used to fill in missing values.
The lid rested lightly on top of the batch vessel, so that if any vapour was produced it was mostly cont
inside the batch vessel, and the vessel contents did not become pressurised.
Notation
t Time (min)
Tc Process fluid temperature (C)
Tinf Temperature of oven walls (C)
Data and plot
Experiment: 1 2
Mass of water: 235 g 240 g
Power setting: HIGH MEDIUM
t (min) Tc (C) Tinf (C) t (min) Tc (C) Tinf (C)
0 13 17 0 16.5 24
0.5 33 19 0.5 29 24
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1 52 20 1 37 25
1.5 68 22 1.5 42 25
2 84 24 2 52 25
2.5 97 25 2.5 60 25
3 66 26
3.5 76 26
4 81 27
4.5 90 275 95 28
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10
Processfluidtemperature(C)
Time (m
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tting; power absorbed by the water is likely to be less than this)
et, but unverified)et, but unverified)
ch vessel.
issivity.
n was
ined
3 4
240 g 430 g
LOW HIGH
t (min) Tc (C) Tinf (C) t (min) Tc (C) Tinf (C)
0 17 25 0 18.5 25
1 20 25 1 38.5 26
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2 22.5 24 2 60.5 28
3 26 24 3 80 30
4 29.5 24 3.5 87 31
5 33 24.5 4 96 32
7.5 43 24.5
10 52 25
12.5 59 26
15 66 26.517.5 71 26
20 76 27.5
12 14 16 18 20
in)
Expt 1
Expt 2
Expt 3
Expt 4
Expt 5
Expt 6
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5 6
440 g 435 g
MEDIUM LOW
t (min) Tc (C) Tinf (C) t (min) Tc (C) Tinf (C)
0 20 28 0 18 27.5
1.5 34 19 2.5 23.5 29
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3 49 30 5 29 29
4 58.5 30 7.5 34 28.5
5 70 31 10 38.5 28
6 81 32 13.2 44 27.5
7 87 33 15 48 27.5
8 96 35 17.5 52 28
20 57 28
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