HAB3-e
Heat transfer coefficients α0 at p0* = 0.1, Ra0 = 1 · 10-6 m and reference values of the heat flux q0
|
|
|||
|
Fluid |
Formula |
Crit. pressure |
α0 |
|
Pc |
α0,exp |
||
|
bar |
W/(m²K) |
||
|
Methane |
CH4 |
45.99 |
7200 |
|
Ethene |
H2C=CH2 |
50.42 |
4200 |
|
Ethane |
CH3CH3 |
48.72 |
4600 |
|
Propene |
H2C=CHCH3 |
45.55 |
4200 |
|
Propane |
CH3CH2CH3 |
42.51 |
4300 |
|
n-Butane |
C4H10 |
37.96 |
3600 |
|
i-Butane |
C4H10 |
36.29 |
3700 |
|
n-Pentane |
C5H12 |
33.70 |
3300 |
|
i-Pentane |
C5H12 |
33.78 |
3200 |
|
n-Hexane |
C6H14 |
30.34 |
3200 |
|
Cyclohexane |
C6H12 |
40.75 |
3000 |
|
n-Heptane |
C7H16 |
27.36 |
2900 |
|
Benzene |
C6H6 |
48.94 |
2900 |
|
Toluene |
C7H8 |
41.26 |
2800 |
|
Diphenyl |
C12H10 |
38.47 |
2100 |
|
Methanol |
CH3OH |
82.16 |
5150 |
|
Ethanol |
CH3CH2OH |
61.31 |
4350 |
|
n-Propanol |
CH3CH2CH2OH |
50.50 |
3750 |
|
2-Propanol |
CH3CHOHCH3 |
47.60 |
3950 |
|
n-Butanol |
CH3CH2CH2CH2OH |
44.10 |
2600 |
|
i-Butanol |
CH3CH3CHCH2OH |
42.95 |
4500 |
|
2-Butanol |
CH3CHOHCH2CH3 |
41.94 |
3400 |
|
Ethanal |
CH3CHO |
55.50 |
3500 |
|
Acetone |
CH3COCH3 |
47.0 |
3300 |
|
|
||||
|
Fluid |
Formula |
ASHRAE |
Crit. pressure |
α0 |
|
Pc |
α0,exp |
|||
|
bar |
W/(m²K) |
|||
|
Trifluoromethane |
CHF3 |
R23 |
48.32 |
4800 |
|
Difluoromethane |
CH2F2 |
R32 |
57.82 |
5000 |
|
Pentafluoroethane |
CHF2CF3 |
R125 |
36.18 |
4400 |
|
1,1,1,2-Tetrafluoroethane |
CH2FCF3 |
R134a |
40.59 |
4200 |
|
1,1,1-Trifluoroethane |
CH3CF3 |
R143a |
37.61 |
4700 |
|
1,1-Difluoroethane |
CH3CHF2 |
R152a |
45.17 |
4600 |
|
2,3,3,3-Tetrafluorprop-1-en |
H2C=CFCF3 |
R1234yf |
32.18 |
3000 |
|
Heptafluoropropane |
CHF2CF2CF3 |
R227ea |
29.25 |
4100 |
|
R125/R143a, aceotropic |
(s. R125 & R143a) |
R507 |
37.05 |
4200 |
|
Cyclooctafluorobutane |
C4F8 |
RC318 |
27.78 |
4200 |
|
Tetrafluoromethane |
CF4 |
R14 |
37.50 |
4750 |
|
1,1-Dichloro-2,2,2-trifluoroethane |
CHCl2CF3 |
R123 |
36.62 |
3000 |
|
Fluorotrichloromethane |
CFCl3 |
R11 |
44.08 |
2800 |
|
Difluorodichloromethane |
CF2Cl2 |
R12 |
41.36 |
4000 |
|
Trifluorochloromethane |
CF3Cl |
R13 |
38.79 |
3900 |
|
Trifluorobromemethane |
CF3Br |
R13B1 |
39.70 |
3500 |
|
Difluorochloromethane |
CHF2CI |
R22 |
49.90 |
3900 |
|
Trifluorotrichloroethane |
CF2ClCFCl2 |
R113 |
33.92 |
2650 |
|
Tetrafluorodichlorethane |
CF2ClCF2CI |
R114 |
32.57 |
3800 |
|
Pentafluorchlorethane |
CF2CICF3 |
R115 |
31.29 |
4200 |
|
R22/R115, aceotropic |
(s. R22 & R115) |
R502 |
40.17 |
3300 |
|
|
|||
|
Fluid |
Formula |
Crit. pressure |
α0 |
|
Pc |
α0,exp |
||
|
bar |
W/(m²K) |
||
|
Chloromethane |
CH3Cl |
66.79 |
4400 |
|
Tetrachloromethane |
CCl4 |
45.60 |
3200 |
|
Sulfur hexafluoride |
SF6 |
37.55 |
3700 |
|
Water |
H2O |
220.64 |
5600 |
|
Ammonia |
NH3 |
113.33 |
7000 |
|
Oxygen |
O2 |
50.43 |
9500 |
|
Nitrogen |
N2 |
33.96 |
10000 |
|
Carbon dioxide |
CO2 |
73.77 |
5500 |
|
Argon |
Ar |
48.63 |
8200 |
|
Neon |
Ne |
26.79 |
20000 |
|
Hydrogen |
H2 |
12.96 |
24000 |
|
|
|||
|
Fluid |
Formula |
Crit. pressure |
α0 |
|
Pc |
α0,exp |
||
|
bar |
W/(m²K) |
||
|
Helium |
He |
2.27 |
2000 |
© Springer Verlag Berlin Heidelberg 2013
s. Variable 35 – Heat transfer coefficient (reference value) alpha0
au is
calculated by additive superposition of the heat transfer coefficient aone,nb and the convective contribution aone,conv, both for a single tube, that is,
au = aone,nb + f · aone,conv
where the factor f depends on the size of the tube bundle and the anticipated inlet flow velocity, where 0.5 ≤ f ≤ 1.