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Calculation Quantities to Turbo Ventilator


Turbo Ventilator Calculation

Calculation – Secltion Procedure.

Determine volume of space to be ventilated

Volume (ft3) + L x W x H, where L + Length, W = width, H=Ht. of building 

Select Air changes par hour inside working area from Table A

Calculate required   ventilator   rate  Q (cfm)

Q (cfm)=(Volume (ft3)  X Air change )/60

Determine number of ventilators=(ventilation Rate Q)/(Exhaust capacity)

                                                                

EXAMPLE: 

Building dimensions with L = 100ft, W=60ft, H=20ft, 

Volume (ft3) =120000 ft3.

Air change rate selected = 12 times per hour. (From table - A)

Calculation   required ventilation rate Q (cfm)                                      

Q (cfm)=(Volume (ft3)  X Air change )/60

Ventilators rate Q (cfm)=(120000 X 12)/60=24000 CFM

 Refer table B , select  suitable  model from table  is AV - 500

Exhaust capacity = 1084,  1 ventilator par hour. 

Under wind velocity of 5 mph , temp. diff. of 5 degrees, stack height = 20 ft

Air ventilator require Quantity =24000/1084=22 Nos


Selection is 22 nos. of AV -500



Table – A: Recommended Air Change Rate

Type of  building  Air change par hour  Type of  building  Air change par hour 
Assembly  hall  6-12 Factories (heavy)  10-30
Auditorium  4-12 Laundry  12-30
Bakeries  12-20 Paper mill 8-30
Boiler room  15-60 Textile mills  4-12
Brewery  8-30 Packing  room  8-30
Class room  10-15 Transformer room 12-30
Engine room   12-30 Paint shops  10-30
Factories (light)  6-12 Warehouse  4-6

Table – B : Performance Data

Wind Velocity (Mph) 5 8 10
Temp. Diff C 10 5 3 10 5 3 10 5 3
Throat Size (inc) Stack Height Exhaust Capacity in CFM
21 10 939 1000 1102 1436 1498 1600 1792 1854 1958
20 1005 1084 1216 1503 1582 1714 1859 1938 2070
30 1058 1154 1314 1556 1652 1812 1915 2010 2168
40 1107 1216 1398 1605 1714 1896 1961 2070 2252
24 10 1163 1252 1400 1763 1852 2000 2187 2276 2424
20 1257 1372 1564 1857 1972 2164 2282 2396 2586
30 1339 1476 1704 1939 2076 2304 2363 2500 2728
40 1407 1564 1826 2007 2164 2426 2428 2586 2850