The Quantity for Installing Our Ventilators:
(References: The ventilating times of the different buildings)
The ventilating cube=the cube of the building × the ventilating times
Ventilating cube
Installing Quantity = ----------------------------------
ventilating cube/hr
For example:
There is a building which is 50M length, 12M width and 6M height. The difference in temperature between indoor and outdoor is 10, and the wind speed is 9.6KM/hr. Moreover the ventilating times of the casting factory according to the standard material is between 10 to 30 times per hour. So the ventilating cube is
(50×12×6) ×10 times/hr = 36000cube/hr .
3600cbm/hr
--------------------------------------------------------------2458cbm/hr(according to the different model 880/500/300)
=14.6(units)
So we'd better install 15 units' ventilators for the workshop.