HBB5-e
Heat transfer coefficients α0 and normalized values of the heat flux at tube-side evaporation
Heat transfer coefficients α0 at p0* = 0,1, Ra0 = 1 · 10-6 m and normalized values of heat flux q0. |
||||||
|
Medium |
Formula |
Pc |
M |
q0 W/m² |
α0 |
|
|
Methane |
CH4 |
|
46,0 |
16,04 |
20000 |
8060 |
|
Ethane |
C2H6 |
|
48,8 |
30,07 |
20000 |
5210 |
|
Propane |
C3H8 |
|
42,4 |
44,10 |
20000 |
4000 |
|
n-Butane |
C4H10 |
|
38,0 |
58,12 |
20000 |
3300 |
|
n-Pentane |
C5H12 |
|
33,7 |
72,15 |
20000 |
3070 |
|
Isopentane |
C5H12 |
|
33,3 |
72,15 |
20000 |
2940 |
|
n-Hexane |
C6H14 |
|
29,7 |
86,18 |
20000 |
2840 |
|
n-Heptane |
C7H16 |
|
27,3 |
100,20 |
20000 |
2420 |
|
Cyclohexane |
C6H12 |
|
40,8 |
84,16 |
20000 |
2420 |
|
Benzene |
C6H6 |
|
48,9 |
78,11 |
20000 |
2730 |
|
Toluene |
C7H8 |
|
41,1 |
92,14 |
20000 |
2910 |
|
Diphenyl |
C12H10 |
|
38,5 |
154,21 |
20000 |
2030 |
|
Methanol |
CH4O |
|
81,0 |
32,04 |
20000 |
4980 |
|
Ethanol |
C2H6O |
|
63,8 |
46,07 |
20000 |
3690 |
|
n-Propanol |
C3H8O |
|
51,7 |
60,10 |
20000 |
3170 |
|
Isopropanol |
C3H8O |
|
47,6 |
60,10 |
20000 |
2920 |
|
n-Butanol |
C4H10O |
|
49,6 |
74,12 |
20000 |
2750 |
|
Isobutanol |
C4H10O |
|
43,0 |
74,12 |
20000 |
2940 |
|
Acetone |
C3H6O |
|
47,0 |
58,08 |
20000 |
3270 |
|
Fluorotrichloromethane |
CFCI3 |
(R 11) |
44,0 |
137,37 |
20000 |
2690 |
|
Difluorodichloromethane |
CF2Cl2 |
(R 12) |
41,6 |
120,91 |
20000 |
3290 |
|
Trifluorochloromethane |
CF3CI |
(R 13) |
38,6 |
104,47 |
20000 |
3910 |
|
Trifluorobromemethane |
CF3Br |
(R 13B1) |
39,8 |
148,93 |
20000 |
3380 |
|
Difluorochloromethane |
CHF2CI |
(R 22) |
49,9 |
86,47 |
20000 |
3930 |
|
Trifluoromethane |
CHF3 |
(R 23) |
48,7 |
70,02 |
20000 |
4870 |
|
Trifluorotrichloroethane |
C2F3CI3 |
(R 113) |
34,1 |
187,38 |
20000 |
2180 |
|
Tetrafluorodichloroethane |
C2F4Cl2 |
(R 114) |
32,6 |
170,92 |
20000 |
2460 |
|
Pentafluorochlorethane |
C2F5CI |
(R 115) |
31,3 |
154,47 |
20000 |
2890 |
Heat transfer coefficients α0 at p0* = 0,1, Ra0 = 1 · 10-6 m and normalized values of heat flux q0. |
||||||
|
Medium |
Formula |
Pc |
M |
q0 W/m² |
α0 |
|
|
1.1- Dichloro-2.2.2-trifluoroethane |
C2HCl2F3 |
(R 123) |
36,7 |
152,93 |
20000 |
2600 |
|
1.1.1.2- Tetrafluoroethane |
C2H2F4 |
(R 134a) |
40,6 |
102,03 |
20000 |
3500 |
|
I.1-Difluoroethane |
C2H4F2 |
(R 152a) |
45,2 |
66,05 |
20000 |
4000 |
|
Hexafluorochloropropane |
C3HF6CI |
(R 226) |
30,6 |
186,48 |
20000 |
3700 |
|
Heptafluoropropane |
C3HF7 |
(R 227) |
29,3 |
170,03 |
20000 |
3800 |
|
Cyclooctafluorobutane |
C4F8 |
(RC 318) |
28,0 |
200,03 |
20000 |
2710 |
|
Chlorodifluoromethane/ Chloropentafluoroethane-Aceotropic |
CHF2Cl/C2F5CI |
(R 502) |
40,8 |
111,6 |
20000 |
2900 |
|
Chloromethane |
CH3CI |
|
66,8 |
50,49 |
20000 |
4790 |
|
Tetrachloromethane |
CCI4 |
|
45,6 |
153,82 |
20000 |
2320 |
|
Tetrafluoromethane |
CF4 |
|
37,4 |
88,0 |
20000 |
4500 |
|
Helium I |
He |
|
2,275 |
4,0 |
1 000 |
2000 |
|
Hydrogen (Para) |
H2 |
|
12,97 |
2,02 |
10000 |
1220 |
|
Neon |
Ne |
|
26,5 |
20,18 |
10000 |
8920 |
|
Nitrogen |
N2 |
|
34,0 |
28,02 |
10000 |
4380 |
|
Argon |
Ar |
|
49,0 |
39,95 |
10000 |
3870 |
|
Oxygen |
02 |
|
50,8 |
32,0 |
10000 |
4120 |
|
Water |
H20 |
|
220,64 |
18,02 |
150000 |
25580 |
|
Ammonia |
NH3 |
|
113,0 |
17,03 |
150000 |
36640 |
|
Carbon dioxide |
CO2 |
|
73,8 |
44,01 |
150000 |
18890 |
|
Sulfur hexafluoride |
SF6 |
|
37,6 |
146,05 |
150000 |
12230 |
© Springer Verlag Berlin Heidelberg 2013
Cryogenic substances here are substances
with boiling temperatures < 180 K,
e.g. N2, H2, He.
Except: Methane, Ethane
CF Factor for horizontal tubes
|
Stoff |
H2 (Para) |
Ne |
Ar |
N2 |
H2O |
SF6 |
R22 |
R134a |
R12 |
R11 |
R116 |
|
CF |
0,79 |
0,95 |
0,93 |
1,67 |
0,72 |
2,07 |
1,23 |
1,67 |
1,06 |
1,87 |
2,46 |
© Springer Verlag Berlin Heidelberg 2013
s. Variable 67 – Reference heat flux
CF Factor for investigated substances in vertical tubes
|
Substance |
H2 (Para) |
He |
NH3 |
H2O |
N2 |
R22 |
R134a |
R12 |
R116 |
SF6 |
R113 |
|
CF |
0,35 |
0,86 |
1,24 |
0,72 |
0,8 |
1,2 |
1,67b |
1,21 |
2,49b |
2,07b |
2,2 |
|
Substance |
Methanol |
Ethanol |
n-Butanol |
Benzene |
Cyclohexane |
n-Pentane |
n-Heptane |
R11 |
|
CF |
0,918 |
1,013 |
1,151 |
1,168 |
1,191 |
1,143 |
1,249 |
1,36 |
b Local measurements for fully wetted vaporizer tube
© Springer Verlag Berlin Heidelberg 2013