Lab Project No.2

(Heat Exchangers)

Dr. Ho Sung Lee

Parallel Flow

Counter Flow

Surface Temperature for Parallel Flow

Double Pipe Surface temperature

0

20

40

60

80

100

120

0 10 20 30 40 50 60

Tube Length (in)

Te

mp

era

ture

(F

)

Fluent simulation

Experiments

Velocity Profiles for the Entry region

Parallel flow

Experiment MathCad Fluent Experiment MathCad Fluent MathCad Fluent

°K °K °K T T T %error %error

Inner inlet 290.9 290.9 290.9 T 5.06 4.83 5.00 4.40% 1.10%

Inner outlet 295.9 295.7 295.9

outer inlet 316.3 316.3 316.3 T 4.89 4.89 5.10 0.00% -4.32%

outer outlet 311.4 311.4 311.2

Effectiveness 0.191 Tlm 4.97 4.86 5.05 2.23% -1.57%

q (Watts) 2762 2543 2637 q (% error) 7.93% 4.53%

Counter flow

Experiment MathCad Fluent Experiment MathCad Fluent MathCad Fluent

°K °K °K T T T %error %error

Inner inlet 288.3 288.3 288.3 T 5.33 5.11 5.30 4.17% 0.62%

Inner outlet 293.6 293.4 293.6

outer inlet 314.8 314.8 314.8 T 4.89 5.11 5.40 -4.55% -

10.45%

outer outlet 309.9 309.7 309.4

Effectiveness 0.194 Tlm 5.11 5.12 5.35 -0.24% -4.74%

q (Watts) 2570 2655 2806 q (% error) -3.31% -9.18%

Shell and tube

Experiment MathCad Experiment MathCad MathCad

°K °K T T %error

Inner inlet 287.4 287.4 T 5.67 5.11 9.80%

Inner outlet 293.1 292.6

outer inlet 318.6 318.6 T 5.56 5.17 7.00%

outer outlet 313.0 313.4

Effectiveness 0.166 Tlm 5.61 5.14 8.41%

Correction factor 0.993

q (Watts) 2937 2705 q (% error) 7.90%

Results for Double Pipe and Shell and Tube heat exchangers