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T-shaped finned tube|Low fin tube

T-shaped finned tubes fins are rolled out of the wall of the plain tube by use of a pass roller. Tube and fin consist of same piece. T-shaped finned tube has good heat transfer effect, Which is cheaper than aluminum porous surface heat transfer tube.

Description

1. Principle of T-shaped finned tube:

T-shaped finned tube is a kind of high efficient heat exchange tube, which is formed by rolling the plain tube. The structure of T-shaped finned tube is characterized by forming a series of spiral annular T-shaped tunnels on the outer surface of the tube. When the medium outside the tube is heated, a series of bubble nuclei are formed in the tunnel. As the tunnel cavity is heated around, the bubble nucleus expands rapidly and fills the inner cavity. Continuous heating increases the pressure inside the bubble rapidly, prompting the bubble to eject rapidly from the slit on the tube surface. When bubbles are ejected, they have a large scouring force site and generate a certain local negative pressure, which makes the surrounding liquid with lower temperature flow into the T-shaped tunnel and form continuous boiling. In unit time, the heat taken away by unit surface area r} is much greater than that of bare tube, so this tube type has a higher boiling heat transfer capacity.

2. Characteristics of T-shaped finned tube:

T-shaped finned tube has good heat transfer effect. The boiling heat transfer coefficient of T tube in R113 medium is 1.6 times to 3.3 times higher than that of smooth tube. For conventional bare tube heat exchanger, only when the temperature of the hot medium is higher than the boiling point or bubble point of the cold medium by 12 ℃ - 15 ℃, the cold medium will bubble and boil. The T-type finned tube heat exchanger only needs a temperature difference of 2 ℃ - 4 ℃, and the cold medium can boil, and the bubble is fine, continuous and fast, forming a unique advantage compared with the smooth tube.

The single tube experiment with Freon 11 as the medium shows that the boiling heat transfer coefficient of T-tube can reach 10 times of that of bare tube, and the total heat transfer coefficient of small tube bundle experiment with liquid ammonia as the medium is 2.2 times of that of bare tube; The industrial calibration of reboiler of C3 and C4 hydrocarbon separation tower shows that the total heat transfer coefficient of T-tube is 50% higher than that of smooth tube at low load and 99% higher at high load.

T-shaped finned tube is cheaper than aluminum porous surface heat transfer tube.

As the gas-liquid disturbance inside the T-shaped finned tube tunnel is very intense and the gas is ejected at a high speed along the T-shaped slot, scaling is not easy to form inside the T-shaped slot or on the outer surface of the tube, which ensures that the equipment can be used for a long time without the heat transfer effect being affected by scaling.

3. Specification of T-shaped finned tube:

16 FINS / INCH   FIN PITCH M = 1.59mm

Plain section

 

 

Finned section

 

 

Code No.

External

Ø

Int.

Wallthickn.

Root dia.

Ø

Ext.

Ø

Wall-thickn.

Ext. surface

Radio outs.

to ins.

Weight

Inch

d1

d2

S1

Int. d3

Ext. d4

d5

BWG

S2

Aa

Aa/Ai

G Cu

 

 

mm

mm

mm

mm

mm

mm

 

mm

m²/m

 

ca. kg/m

16.1/2.19

16.1/2.18

1/2"

12,70

9,80

9,40

1,45

1,65

7,50

7,00

9,50

12,50

19

18

1,00

1,25

0,08

3,6

3,8

0,38

0,43

16.5/8.17

16.5/8.16

5/8"

15,90

11,90

11,60

2,00

2,15

9,70

9,40

12,70

15,70

17

16

1,50

1,65

0,11

3,6

3,7

0,65

0,69

16.3/4.17

16.3/4.16

16.3/4.14

3/4"

19,00

15,00

14,70

14,00

2,00

2,15

2,50

12,80

12,50

11,60

15,80

18,80

17

16

14

1,50

1,65

2,10

0,13

3,3

3,4

3,6

0,83

0,88

1,03

16.7/8.17

16.7/8.16

16.7/8.14

7/8"

22,20

18,20

17,90

17,20

2,00

2,15

2,50

16,00

15,70

14,80

19,00

22,00

17

16

14

1,50

1,65

2,10

0,16

3,1

3,2

3,3

1,00

1,06

1,25

16.1.17

16.1.16

16.1.14

1"

25,40

21,40

21,10

20,40

2,00

2,15

2,50

19,20

18,90

18,00

22,20

25,20

17

16

14

1,50

1,65

2,10

0,18

3,0

3,1

3,2

1,18

1,25

1,49

19 FINS / INCH   FIN PITCH M = 1.33mm

19.1/2.21

19.1/2.20

19.1/2.19

19.1/2.18

1/2"

12,70

10,30

10,10

9,90

9,50

1,20

1,30

1,40

1,60

7,90

7,70

7,50

7,00

9,50

12,50

21

20

19

18

0,80

0,90

1,00

1,25

0,10

4,0

4,1

4,2

4,5

0,32

0,34

0,38

0,42

19.5/8.21

19.5/8.20

19.5/8.19

19.5/8.18

19.5/8.17

19.5/8.16

5/8"

15,90

13,40

13,20

13,00

12,60

11,90

11,60

1,25

1,35

1,45

1,65

2,00

2,15

11,10

10,90

10,70

10,20

9,70

9,40

12,70

15,70

21

20

19

18

17

16

0,80

0,90

1,00

1,25

1,50

1,65

0,12

3,6

3,7

3,8

4,0

4,2

4,3

0,44

0,47

0,51

0,58

0,69

0,74

19.3/4.20

19.3/4.19

19.3/4.18

19.3/4.17

19.3/4.16

19.3/4.14

3/4"

19,00

16,30

16,10

15,70

15,00

14,80

14,10

1,35

1,45

1,65

2,00

2,10

2,45

14,00

13,80

13,30

12,80

12,50

11,60

15,80

18,80

20

19

18

17

16

14

0,90

1,00

1,25

1,50

1,65

2,10

0,15

3,5

3,6

3,7

3,8

3,9

4,2

0,61

0,63

0,72

0,83

0,88

1,03

19.7/8.19

19.7/8.18

19.7/8.17

19.7/8.16

19.7/8.14

7/8"

22,20

19,30

18,90

18,20

18,00

17,30

1,45

1,65

2,00

2,10

2,45

17,00

16,50

16,00

15,70

14,80

19,00

22,00

19

18

17

16

14

1,00

1,25

1,50

1,65

2,10

0,18

3,4

3,5

3,6

3,7

3,9

0,80

0,89

1,00

1,07

1,26

19.1.18

19.1.17

19.1.16

19.1.14

1"

25,40

22,10

21,40

21,10

20,50

1,65

2,00

2,15

2,45

19,70

19,20

18,90

18,00

22,20

25,20

18

17

16

14

1,25

1,50

1,65

2,10

0,21

3,4

3,5

3,6

3,7

1,05

1,19

1,27

1,50

26 FINS / INCH   FIN PITCH M = 0.97mm

4. T-shaped finned tube material:

Material

ASTM

DIN

German  Mat.-No.

BS

Grade

Carbon Steel

Carbon Steel

Carbon Steel

Carbon Steel

A 179

A 192 / A 161 Gr. LC

A 210 Gr. A1

A 210 Gr.C

ST 35.8/I

ST 35.8/I

ST 45.8/I

17 Mn 4

1.0305 1.0305 1.0405

1.0481

3602/1

3059/2

3602/1

3602/1

CFS 360

CFS/HFS 360

CFS/HFS 410

CFS/HFS 460

Low Alloy Steel

Low Alloy Steel

Low Alloy Steel

Low Alloy Steel

Low Alloy Steel

A 209 T1

A 213 / A 199 T11/T12

A 213 / A 199 T22

A 213 / A 199 T5

A 213 / A 199 T9

16 Mo 5

13 CrMo 44

10 CrMo 910

12 CrMo 195

X12 CrMo 91

1.5423 1.7335 1.7380 1.7362

1.7386

3606

3604

3059

3604

3059/3604

245

621

622-440 625

629-470

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

A 213 / A 269 / A249 TP 304

A 213 / A 269 / A249 TP 304L

A 213 / A 269 / A249 TP 321

A 213 / A 269 / A249 TP 316

A 213 / A 269 / A249 TP 316L A 213 / A 269 / A249 TP 347

A 213 / A 269 / A249 TP 316Tl

A 789 / A 790 UNS S 31803 B 677 Alloy 904L

X5 CrNi 189

X2 CrNi 189

X10 CrNiTi 189

X5 CrNiMo 1810

X2 CrNiMo 1810

X10 CrNiNb 189

X10 CrNiMoTi 1810 X2 CrNiMo 11225

X2 NiCrMoCu 25205

1.4301 1.4306 1.4541 1.4401 1.4404

1.4550

1.4571

1.4462

1.4539

970

970

970

970

970

970

970

–––

–––

304 S 15

304 S 12

321 S 12

315  S 16

316  S 12

347 S 17

320 S 17

Nickel

Nickel

B 161 UNS No 2200

B 161 UNS No 2201

Ni 99,2

Ni 99,2

2.4066

2.4068

3074

3074

NA 11

NA 12

Nickel-Copper

B 163 N 04400

NiCu30Fe

2.4360

3074

NA 13

Nickel-Chrom-Iron

Nickel-Chrom-Iron

Nickel-Chrom-Iron

Nickel-Chrom-Iron

B 163 6600

B 161 8825

B 468 08020

B 163 08800

NiCr15Fe

NiCr21Mo

––– X10 NiCrAlTi 3220

2.4816 2.4858

1.4876

3074

3074 ––– 3074

NA 14

NA 16

NA 15

Copper Alloy

Copper Alloy

Copper Alloy

Copper Alloy

Copper Alloy

Copper Alloy

Copper Alloy

B 75 / B 111 UNS C12200

B 75 / B 111 UNS C14200 B 111 UNS C44300

B 111 UNS C68700

B 111 UNS C60800

B 111 UNS C70600

B 111 UNS C71500

Sf-Cu

CuAsp

CuZn28Sn1

CuZn20Al2

CuAl5AS

CuNi10Fe1Mn

CuNi30Mn1Fe

2.0090 2.1491 2.0470 2.0460 2.0918 2.0872

2.0882

2871

2871

2871

2871 ––– 2871

2871

C 106

C 107

CZ 111

CZ 110

CN 102

CN 107

Aluminium Alloys

Aluminium Alloys

Aluminium Alloys

Aluminium Alloys

Alloy 1050 / 1050A

Alloy 5754

Alloy 3003

Alloy 5083

Al 99,5

AlMg3

AlMnCu

AlMg4,5Mn

3.0255 3.3535 3.0517

3.3547

1050A (1B)

(N5)

––– 5083 (N8)

 

Titanium

B338 Gr. 2

Ti2

3.7035

 

 

5. Applicable scope of T-shaped finned tube:

As long as the shell side medium is clean, free of solid particles and gums, T-shaped finned tubes can be used as heat exchange elements to form T-shaped finned tube high efficiency heat exchanger to improve the boiling heat transfer effect at the shell side. T-shaped finned tube is applicable to the working conditions of shell side boiling heat transfer in petrochemical, energy and other industrial fields. It is not applicable to the medium with solid dust and easy coking in the shell.

T-shaped finned tube

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