Question

1. Find out the specific heat and thermal conductivity of air at -12°C. Use the following table and show all work. Table A.4.4 Physical Properties of Dry Air at Atmospheric Pressure Volumetric coefficient Temperature of Specific Thermal Thermal Kinematic Prandti T Density (p) expansion (1) heat (c) (°C) (K) (kg/m³) (×10-3 K) (kJ/[kg K]) (W/[m K]) conductivity (k) diffusivity (2) Viscosity (μ) viscosity (v) number (x10m²/s) (x10- Ns/m²) (x10 m²/s) (Np.) -20 253.15 1.365 3.97 1.005 0.0226 16.8 16.279 12.0 0.71 0 273.15 1.252 3.65 1.011 0.0237 19.2 17.456 13.9 0.71 10 283.15 1.206 3.53 1.010 0.0244 20.7 17.848 14.66 0.71 20 293.15 1.164 3.41 1.012 0.0251 22.0 18.240 15.7 0.71 30 303.15 1.127 3.30 1.013 0.0258 23.4 18.682 16.58 0.71 40 313.15 1.092 3.20 1.014 0.0265 24.8 19.123 17.6 0.71 50 323.15 1.057 3.10 1.016 0.0272 26.2 19.515 18.58 0.71 60 333.15 1.025 3.00 1.017 0.0279 27.6 19.907 19.4 0.71 70 343.15 0.996 2.91 1.018 0.0286 29.2 20.398 20.65 -0.71 80 353.15 0.968 2.83 1.019 0.0293 30.6 20.790 21.5 0.71 90 363.15 0.942 2.76 1.021 0.0300 32.2 21.231 22.82 0.71 100 373.15 0.916 2.69 1.022 0.0307 33.6 21.673 23.6 0.71 120 393.15 0.870 2.55 1.025 0.0320 37.0 22.555 25.9 0.71 140 413.15 0.827 2.43 1.027 0.0333 40.0 23.340 28.2 0.71 150 423.15 0.810 2.37 1.028 0.0336 41,2 23.732 29.4 0.71 160 433.15 0.789 2.31 1.030 0.0344 43.3 24.124 30.6 0.71 180 453.15 0.755 2.20 1.032 0.0357 47.0 24.909 33.0 0.71 200 473.15 0.723. 2.11 1.035 0.0370 49.7 25.693 35.5 0.71 250 523.15 0.653 1.89 1.043 0.0400 60.0 27.557 42.2 0.71 Source: Adapted from Raznjevic (1978).

          1. Find out the specific heat and thermal conductivity of air at -12°C. Use the following table and
show all work.
Table A.4.4 Physical Properties of Dry Air at Atmospheric Pressure
Volumetric
coefficient
Temperature
of
Specific Thermal
Thermal
Kinematic Prandti
T
Density (p) expansion (1) heat (c)
(°C) (K) (kg/m³) (×10-3 K) (kJ/[kg K]) (W/[m K])
conductivity (k)
diffusivity (2) Viscosity (μ) viscosity (v) number
(x10m²/s) (x10- Ns/m²) (x10 m²/s) (Np.)
-20 253.15
1.365
3.97
1.005
0.0226
16.8
16.279
12.0
0.71
0 273.15
1.252
3.65
1.011
0.0237
19.2
17.456
13.9
0.71
10 283.15
1.206
3.53
1.010
0.0244
20.7
17.848
14.66
0.71
20 293.15
1.164
3.41
1.012
0.0251
22.0
18.240
15.7
0.71
30 303.15 1.127
3.30
1.013
0.0258
23.4
18.682
16.58
0.71
40 313.15
1.092
3.20
1.014
0.0265
24.8
19.123
17.6
0.71
50 323.15
1.057
3.10
1.016
0.0272
26.2
19.515
18.58
0.71
60 333.15
1.025
3.00
1.017
0.0279
27.6
19.907
19.4
0.71
70 343.15
0.996
2.91
1.018
0.0286
29.2
20.398
20.65
-0.71
80 353.15
0.968
2.83
1.019
0.0293
30.6
20.790
21.5
0.71
90 363.15
0.942
2.76
1.021
0.0300
32.2
21.231
22.82
0.71
100 373.15
0.916
2.69
1.022
0.0307
33.6
21.673
23.6
0.71
120 393.15
0.870
2.55
1.025
0.0320
37.0
22.555
25.9
0.71
140 413.15
0.827
2.43
1.027
0.0333
40.0
23.340
28.2
0.71
150 423.15
0.810
2.37
1.028
0.0336
41,2
23.732
29.4
0.71
160 433.15
0.789
2.31
1.030
0.0344
43.3
24.124
30.6
0.71
180 453.15
0.755
2.20
1.032
0.0357
47.0
24.909
33.0
0.71
200 473.15
0.723.
2.11
1.035
0.0370
49.7
25.693
35.5
0.71
250 523.15
0.653
1.89
1.043
0.0400
60.0
27.557
42.2
0.71
Source: Adapted from Raznjevic (1978).

1 find out the specific heat and thermal conductivity of air at 12c use the following table and show all work table a44 physical properties of dry air at atmospheric pressure volumetric coef 86697

Added by Lourdes C.

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