# Velocity Pressure Method Calculation Sheet - Excel - Excel

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```					                        Velocity Pressure Method Calculation Sheet
Plant Name: ____________________________ Elevation: _________ Date: ________________
Location: _______________________________ Temp: ____________ Drawing #.:___________
Department: ____________________________+ Factor: ___________ Designer: _____________

1    Duct Segment Identification                                   Ab          bc          cd             ef
2    Target Volume Flowrate, Q = V*A- Chap 10            cfm     390.0        390.0       390.0          390.0
3    Min. Transport Velocity, V Chap 10                 fpm       4000
0.5
4                                                    )
Maximum Duct Diameter (D= ((4*144*Q)/(pi*V)) inches          4.22                    4.50      4.50
5    Selected duct diameter                         inches        4.00                    0.11      0.11
2
6    Duct Area (pi*(D/12) /4)                          sq. ft    0.0870                3532.0000 3532.0000
7    Actual Duct Velocity                               fpm      4467.0                   0.8       0.8
2
8    Duct Velocity Pres, VP = (V/4005)                   "wg     1.2400
9     H       Maximum Slot Area = (2/11)                sq ft
10            Slot area selected                        sq ft
11    O S Slot Velocity, Vs Chap 10                     fpm
2
12    O L Slot Velocity Pres, VPs=(Vs/4005)              "wg
13    D O Slot Loss Coefficient - Chap 10, Chap 3
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 F5-14, Chap 5                 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      2.046                   1.160
21    N Other Losses                                     "wg                  2.000
22        Hood Static Pressure SPh (16+20+21)            "wg     2.046                    1.160
23   Straight Duct Length                                  ft     15.0                      1.0           10.0
24   Friction Factor (Hf)                                        0.0703                   0.0620         0.0620
25   Friction Loss per VP (23 * 24)                              1.0545                   0.0620         0.6200
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)                        1.0545                   0.0620         0.6200
34   Duct Loss (8*33)                                    "wg     1.3080                   0.0500         0.4800
35   Duct Segment SP Loss (22 + 34)                      "wg     3.350       2.000        1.210
36   Other losses                                        "wg     -3.350      -5.350       -6.560         0.480
37   Cumulative Static Pressure                          "wg
38   Governing Static Pressure (at TO location)          "wg
39   Corrected Volumetric Flowrate                       cfm
40   Corrected Velocity                                 fpm
41   Corrected Velocity Pressure                         "wg
42   Resultant Velocity Pressure                         "wg
Q1      Q
PERTINENT EQUATIONS:                                               VPr       VP1  2 VP2
Q3      Q3
SPgov .
Qcorr  Qdesign
SPduct                                         OR

V      
2
0.533
0.4937                                               Q1  Q2       

Hf  0.0307 0.612   0.079
Q       Q
V Pr                    
                * D1.066                                      4005*( A1  A2 )                                            Branch Entry
Loss Factors
FSP  SPoutlet  SPinlet  VPinlet                                                                                                      Angle (*)   Factor
Elbow Loss Factors:                                                                     10         0.06
FanTP  SPout  SP  VPout  VP
in           in                                                       45oelbow=1/2 loss
60*elbow = 2/3 loss                               30*elbow= 1/3 loss      15         0.09
SP3  SP1  (VP3  V Pr)                                                                                                                   20         0.12
R/D                                    25         0.15
o
90 elbow         0.5        0.75           1            1.5         2        2.5        30         0.18
Other Information:                                 Stamped          0.71       0.33         0.22           0.15      0.13       0.12       35         0.21
5-piece            -        0.46         0.33           0.24      0.19       0.17       40         0.25
4-piece            -        0.5          0.37           0.27      0.24       0.23       45         0.28
3-piece          0.9        0.54         0.42           0.34      0.33       0.33       50         0.32
60         0.44
90         1.00
see Fig 5-14
Fig 5-15
The final calculations:

The fan Sp = Spo - Spin - Vpin
0.48 - ( -6.56) - - 1.15
= = 0.499 - (-3.09)0.78
6.26 "wg
= = 2.439 fpm

The fan TP = SP o - SP in + VP o - VP in
= 0.499 (- 3.09) + 1.15 -1.15
= 0.48 - ( --6.56 ) +0.78 - 0.78
= 3.589
= 7.04 "wgfpm

BHP              =( Fan TP * Q)/(6362 * n)
(7.04) * 390) / 6362 * 0.9)
= = ( 3.589 * 1500) / ( 6362 * 0.9)
0.48 hp
= = 0.94
Velocity Pressure Method Calculation Sheet
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                      fpm
0.5
4 Maximum Duct Diameter (D= ((4*144*Q)/(pi*V)) ) inches
5 Selected Duct Diameter                            inches
2
6 Duct Area (pi*(D/12) /4)                            sq. ft
7 Actual Duct Velocity                                 fpm
2
8 Duct Velocity Pres, VP = (V/4005)                     "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
2
12 O L Slot Velocity Pres, VPs = (Vs/4005)               "wg
13 D O Slot Loss Coefficient - Chap 10, Chap 3
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 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
35 Duct SP Loss (22 + 34)                                "wg
36 Other Losses                                          "wg
37 Cumulative Static Pressure                            "wg
38 Governing Static Pressure (at TO location)            "wg
39   Corrected Volumetric Flowrate                      cfm
40   Corrected Velocity                                 fpm
41   Corrected Velocity Pressure                        "wg
42   Resultant Velocity Pressure                        "wg

PERTINENT EQUATIONS:

SPgov .
Qcorr  Qdesign
SPduct
Q1      Q
VPr       VP1  2 VP2
Q3      Q3
V0.533     0.4937

Hf  0.0307 0.612  0.079 1.066
Q  Q * D
      
FSP  SPoutlet  SPinlet  VPinlet                                                         2
    Q1  Q2         
FanTP  SPout  SP  VPout  VP                           V Pr                      
 4005 * ( A1  A2 ) 
in           in

SP  SP  (VP V Pr)
3    1     3

Other Information:

Branch Entry               Elbow Loss Factors:
Loss Factors                          60*elbow = 2/3 loss      45oelbow=1/2 loss            30*elbow= 1/3 loss
Angle (*)    Factor
10          0.06                                                     R/D
15          0.09        90oelbow            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 5-14
Fig 5-15

```
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