toilet exhaust riser.pdf

Item

No. Identification

Length

(m)

No of Fittings

& Accessories

Air Flow

Rate (L/S)

Duct

Velocity

(m/s)

Velocity

Pressure

(Pa)

Loss

Coefficients

for Fittings

Equivalent

Dia (mm)

Pressure

Drop

(Pa/m)

1.00 Straight Duct Section

1.01 a-b 1150 550 1.00 6,707 10.60 67.69 855.1 1.49

1.02 b-c 1150 550 1.00 6,707 10.60 67.69 855.1 1.49

1.03 c-d 1150 550 2.45 5,967 9.43 53.58 855.1 1.19

1.04 d-e 1000 550 2.45 5,967 10.85 70.86 801.8 1.65

1.05 e-f 1000 550 2.45 5,311 9.66 56.13 801.8 1.32

1.07 f-g 900 550 2.45 5,311 10.73 69.30 763.4 1.69

1.08 g-h 900 550 2.45 4,641 9.38 52.92 763.4 1.30

1.09 h-i 800 550 2.45 4,641 10.55 66.98 722.0 1.73

1.10 i-j 800 550 2.45 3,910 8.89 47.54 722.0 1.24

1.11 j-k 700 550 2.45 3,910 10.16 62.09 677.1 1.72

1.12 k-l 700 550 2.45 3,204 8.32 41.69 677.1 1.17

1.13 l-m 600 550 2.45 3,204 9.71 56.75 627.8 1.72

1.14 m-n 600 550 2.45 2,472 7.49 33.78 627.8 1.04

1.15 n-o 500 550 2.45 2,472 8.99 48.64 573.1 1.65

1.16 o-p 500 550 2.45 1,782 6.48 25.28 573.1 0.88

1.17 p-q 400 550 2.45 1,782 8.10 39.50 511.1 1.57

1.18 q-r 400 550 2.98 1,054 4.79 13.82 511.1 0.58

1.19 r-s 250 550 2.98 1,054 7.67 35.37 397.7 2.04

1.20 s-t 250 550 2.28 261 1.90 2.17 397.7 0.15

1.21 t-u 150 550 2.28 261 3.16 6.03 298.8 0.61

1.22 u-v 150 550 1.00 261 3.16 6.03 298.8 0.61

1.23 v-w 2.00 #DIV/0! #DIV/0! #DIV/0!

Duct Fittings

2.00 Bends & Elbows

2.01 b-Bend-90 Degree 1150 550 1 6,707 10.60 67.69 0.18 855.1

2.02 i-Bend-90 Degree 350 200 1 187 2.67 4.30 0.24 286.4

2.03 m-Bend-90 Degree 350 200 1 6,707 95.81 5526.59 0.19 286.4

2.04 w - Bend-90 Degree 850 450 1 2,825 7.39 32.84 0.19 667.7

Duct Size

2.05

ab,ac - Bend-90

Degree 494 552 2 2,825 10.36 64.61 0.21 570.6

3.00 Tees

3.01 c - Tee - main 200 200 1 25 0.63 0.24 2.23 218.6

3.02 d- Tee - Main 200 200 1 48 1.20 0.87 0.99 218.6

3.03 e- Tee - Main 200 200 1 73 1.83 2.01 0.57 218.6

3.04 f- Tee - Main 250 200 1 98 1.96 2.31 0.25 244.1

3.05 f1- Tee - Main 250 200 1 114 2.28 3.13 0.38 244.1

3.06 h- Tee - Main 250 200 1 172 3.44 7.12 0.10 244.1

3.07 j - Tee - main 350 200 1 187 2.67 4.30 0.10 286.4

3.08 k- Tee - main 350 200 1 210 3.00 5.42 0.10 286.4

3.09 l - Tee - main 350 200 1 235 3.36 6.78 0.10 286.4

3.10 n- Tee - main 400 300 1 260 2.17 2.83 2.53 377.7

3.11 o- Tee - main 600 350 1 545 2.60 4.05 0.99 496.5

3.12 p- Tee - main 600 350 1 830 3.95 9.40 0.61 496.5

3.13 q- Tee - main 700 400 1 1,115 3.98 9.55 0.38 572.9

3.14 r- Tee - main 700 400 1 1,400 5.00 15.05 0.30 572.9

3.15 s- Tee - main 850 450 1 1,685 4.41 11.68 0.25 667.7

3.16 t- Tee - main 850 450 1 1,685 4.41 11.68 0.18 667.7

3.17 u- Tee - main 850 450 1 2,255 5.90 20.92 0.10 667.7

3.18 v- Tee - main 850 450 1 2,540 6.64 26.55 0.10 667.7

3.19 g- Tee - branch 250 200 1 172 3.44 7.12 1.72 244.1

4.00 Transition

4.01

f- Transition (200x200 -

250x200) 200 200 1 98 2.45 3.61 0.14 218.6

4.02

i- Transition (250x200 -

350x200) 250 200 1 187 3.74 8.42 0.21 244.1

4.03

n- Transition (350x200

- 400x300) 350 200 1 260 3.71 8.31 0.29 286.4

4.04

o- Transition (400x300

- 600x350) 400 300 1 545 4.54 12.42 0.30 377.7

4.05

q- Transition (600x350-

700x400) 600 350 1 1,115 5.31 16.97 0.18 496.5

4.06

s- Transition (700x400-

850x450) 700 400 1 1,685 6.02 21.80 0.20 572.9

4.07

x- Transition (850x450-

900x915) 850 450 1 2,825 7.39 32.84 0.49 667.7

4.08

x- Transition (900x915-

494x552) 900 915 1 2,825 3.43 7.08 0.07 992.0

5.00 VCD

5.01 Airfoil blade 350 200 1 260 3.71 8.31 0.18 286.4 -

6.00 Flexible duct

6.01 150 1.00 1 25 1.41 0.70

7.00 Disk Valve

7.01 LVS/200/G1 - - 1 25 - - - -

8.00 Sound attenuator

8.01

MSA200-105-3-

PF/915x900x1500

9.00 Discharge louver

9.01 Bird guard mesh 494 552 1 2,825 10.36 64.61 0.58 570.6 -

External Static Pressure of Toilet Exhaust Fan (Pa)

Add 20% safety factor

Total External Static Pressure of Toilet Exhaust Fan (Pa)

Design Data from ASHRAE Unit

page 34.2 Velocity Pressure = 0.602 x V2

Time- s

Velocity - ms-1

Velocity = Flow Rate / Area Flow Rate - m3s

-1

Area - m2

Loss Coefficient

900

Bends r/w=1.0

Flexible duct pressure drop calculation

Re=66.4*V*Dh (eq 23, page 32.7)

f'=0.11 * ( Ɛ / Dh + 68 / Re) ^ 0.25

if f'>=0.018; f=f'

if f'< 0.018; f=0.85f'+0.0028

Duct diameter (Dh) 150 mm

Ɛ 3 mm

Re ###

f' 0.04

f 0.04

ΔPf 0.35 Pa/m

Correction factor 2

ΔPf 0.7 Pa/m

Total Pressure

Drop (Pa) Remarks

1.49

1.49

2.92

4.04

3.22

4.14

3.19

4.23

3.04

4.21

2.87

4.21

2.55

4.05

2.16

3.86

1.72

6.08

0.34

1.39

0.61

0.00

12.18 H/W=1, θ=90°, page 34.54, ASHRAE 2009 HB

1.05 H/W=0.57,K=1, r/W=1, Page21.52, ASHRAE 2009 HB 0.571429

1050.05 H/W=0.5,K=1, r/W=1, Page21.52, ASHRAE 2009 HB

6.24 H/W=1.9, K=1, r/W=1, Page 21.52,ASHRAE 2009 HB

27.14 H/W=1, K=1, r/W=1, Page 21.52,ASHRAE 2009 HB

0.52 Qs/Qc=0.52, Page 21.58, ASHRAE 2009 HB

0.86 Qs/Qc=0.66, Page 21.58, ASHRAE 2009 HB 0.657534



1.19 Qs/Qc=0.80, Page 21.58, ASHRAE 2009 HB














12.25 Q1b/Qc=0.83, Table 14-13-I, SMACNA 1990

0.51 Refer ER4-1 page 21.58, ASHRAE 2009 HB







0.50 Refer Table 14-12-A page 14.27, SMACNA 1990

1.49 Refer CR9-4 page 21.57

0.70

calculated according to ASHRAE 1997 fundamentals, pg

32.7

10.00 Diagram 8, Type - LVS

39.00

37.47

n=0.7, A1/A0=1, Refer CR6-1 page 32.42, ASHRAE 2009

HB

1,333.05

266.61

1,599.66

1.66113 0.637105

toilet exhaust riser.pdf

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