8/12/2019 Design 2 Solution 27th Edition

1/4

Plant Name: ____________________________ Elevation: _________ Date: ________________

Location: _______________________________ Temp: ____________ Drawing #.:___________Department: ____________________________+ Factor: ___________ Designer: _____________

1 Duct Segment Identification Ab bc cd ef Fan SP

2 Target Volume Flowrate, Q = V*A- Chap 13 cfm 390.0 390.0 390.0 390.0 Note: De

3 Min. Transport Velocity, V Chap 13 fpm 4000 3000 3000

4 Maximum Duct Diameter (D= ((4*144*Q)/(pi* inches 4.23 4.88 4.88

5 Selected duct diameter inches 4.00 4.50 4.50

6 Duct Area (pi*(D/12)2/4) sq. ft 0.0872 0.1104 0.1104

7 Actual Duct Velocity fpm 4471.3 3532.9 3532.9

8 Duct Velocity Pres, VP = (V/4005)2

"wg 1.2464 0.7781 0.7781

9 H Maximum Slot Area = (2/11) sq ft10 Slot area selected sq ft

11 O S Slot Velocity, Vs Chap 13 fpm

12 O L Slot Velocity Pres, VPs=(Vs/4005)2

"wg

13 D O Slot Loss Coefficient - Chap 13, Chap 5

14 T Acceleration Factor 0 or 1

15 S S Slot Loss per VP (13+14)

16 U Slot Static Pressure (12*15) "wg

17 C Duct Entry Loss Coefficient Chapter 13 0.650 0.490

18 T Acceleration Factor (1 at hoods) 1 or 0 1 1

19 I Duct Entry Loss per VP (17 + 18) 1.65 1.49

20 O Duct Entry Loss (8 * 19) "wg 2.057 1.15921 N Other Losses "wg 2.000

22 Hood Static Pressure SPh (16+20+21) "wg 2.057 1.159

23 Straight Duct Length ft 15.0 1.0 10.0

24 Friction Factor (Hf) 0.0709 0.0628 0.0628

25 Friction Loss per VP (23 * 24) 1.0635 0.0628 0.6280

26 No. of 90 degree Elbows

27 Elbow loss coefficient (bottom of page)

28 Elbow Loss per VP (26*Loss Factor)(bottom of page)

29 No. of branch entries (1 or 0)

30 Entry loss coefficient

31 Entry Loss per VP (29*Loss Factor)(Branch)32 Special Fittings Loss Factors

33 Duct Loss per VP (25 + 28 + 31 + 32) 1.0635 0.0628 0.6280

34 Duct Loss (8*33) "wg 1.3256 0.0489 0.4887

35 Duct Segment SP Loss (22 + 34) "wg 3.382 2.000 1.208 0.489

36 Other losses "wg

Velocity Pressure Method Calculation Sheet

Velocity Pressure Method Calculation Sheet

8/12/2019 Design 2 Solution 27th Edition

2/4

36 Other losses "wg

Plant Name: ____________________________ Elevation: _________ Date: ________________

Location: _______________________________ Temp: ____________ Drawing No.:___________

Department: ____________________________+ Factor: ___________ Designer: _____________

1 Duct Segment Identification

2 Volume Flowrate, Q = V* A (Chap 10) cfm

3 Min. Transport Velocity Chap 10 fpm4 Maximum Duct Diameter (D= ((4*144*Q)/(pi*V)) inches

5 Selected Duct Diameter inches

6 Duct Area (pi*(D/12)2/4) sq. ft

7 Actual Duct Velocity fpm

8 Duct Velocity Pres, VP = (V/4005)2

"wg

9 H Maximum Slot Area = (2/11) sq ft

10 O Slot area selected sq ft

11 O S Slot Velocity, Vs Chap 10 fpm

12 O L Slot Velocity Pres, VPs = (Vs/4005)2

"wg

13 D O Slot Loss Coefficient -Chap 10, Chap 3

14 TAcceleration Factor 0 or 115 S S Slot Loss per VP (13+14)

16 U Slot Static Pressure(12 * 15) "wg

17 C Duct Entry Loss Factor F5-14, Chap 10

18 T Acceleration Factor (1 at hoods) 1 or 0

19 I Duct Entry Loss per VP (17 + 18)

20 O Duct Entry Loss (8 * 19) "wg

21 N Other Loss "wg

22 Hood Static Pressure SPh (16+20+21) "wg

23 Straight Duct Length ft

24 Friction Factor (Hf)

25 Friction Loss per VP (23 * 24)

26 No. of 90 degree Elbows

27 Elbow Loss Coefficient (Bottom of Page)

28 Elbow Loss per VP (26*Loss Factor)(bottom of page)

29 No. of Branch Entries ( 1 or 0)

30 Entry Loss Coefficient

31 Entry Loss per VP (29*Loss Factor)(Branch)

32 Special Fittings Loss Factors

33 Duct Loss per VP (25 + 28 + 31 + 32)

34 Duct Loss (8*33) "wg

35Duct SP Loss (22 + 34)

"wg36 Other Losses "wg

37 Cumulative Static Pressure "wg

38 Governing Static Pressure (at TO location) "wg

Velocity Pressure Method Calculation Sheet

Velocity Pressure Method Calculation Sheet

8/12/2019 Design 2 Solution 27th Edition

3/4

39 Corrected Volumetric Flowrate cfm

40 Corrected Velocity fpm

41 Corrected Velocity Pressure "wg

42 Resultant Velocity Pressure "wg

PERTINENT EQUATIONS:

Other Information:

Branch Entry Elbow Loss Factors:

Loss Factors 60*elbow = 2/3 loss 45o

elbow=1/2 loss 30*elbow= 1/3 loss

Angle (*) Factor

10 0.06 R/D15 0.09 90

oelbow 0.5 0.75 1 1.5 2 2.5

20 0.12 Stamped 0.71 0.33 0.22 0.15 0.13 0.12

25 0.15 5-piece - 0.46 0.33 0.24 0.19 0.17

30 0.18 4-piece - 0.5 0.37 0.27 0.24 0.23

35 0.21 3-piece 0.9 0.54 0.42 0.34 0.33 0.33

40 0.25

45 0.28

50 0.32

60 0.44

90 1.00

see Fig 5-14Fig 5-15

Q QSP

SPcorr design

gov

duct

.

VP Q

QVP

Q

QVPr

1

3

1

2

3

2

2

21

21

)(*4005Pr

AAQQV

06.1079.0612.0

533.0

*

493.00307.0

DQQ

VHf

Pr( 313 VVPSPSP

FSP SP SP VPoutlet inlet inlet

FanTP SP SP VP VPout in out in

8/12/2019 Design 2 Solution 27th Edition

4/4