Table 5

Inlet temperatures 0 °C
65 °C

Cold fluid flow rate (water pump)Flow rate3L min-1
0.00005m3 s-1
Density water999kg m3
Flow rate0.04995kg s-1
dot 0.04995kg s-1

Hot fluid flow rate (blower at average capacity) dot 2000m3 hr-1
Density air1.2kg m3
2400kg hr-1
dot 0.66667kg s-1

Specific heat capacities 4.19kJ kg-1K-1
1.004kJ kg-1K-1

Pipe properties (stainless steel) 0.02465m
0.02667m
Thickness0.00202m
16.3W m-1K-1

Heat transfer coefficients       1200W m-2K-1
50W m-2K-1

Heat capacity rates         209.2905W K-1
669.3333W K-1

Heat capacity ratio         209.2905W K-1

0.31269

Fouling capacity (standard) 0.002m2K W-1

Overall heat transfer coefficient  0.02
0.0009015
Wall0.0000644
Fouling inside0.0021637
Fouling outside0.002
39.7936W m2K-1

Pipe total surface area 7.96M2

NTU               NTU1.5135

             eqn top line0.6466
eqn bottom line0.8895
0.7270

Outlet temperatures       14.7750
50.2250 °C
47.2520
47.2520 °C

Energy balance check 9889.3897kW
50.2250ºC

Pipe length neededSurface area0.0838m2 m-1
Pipe length95.0036m