Module 10.13

This module will look at step seven. In this step you determine the number of extract points to satisfy the AvCv and this will depend on the co-efficient of the ventilator (usually 0.6) and the sizes available. For mechanical extraction you simply divide the total volumetric extract rate required by the rating of the fans. It may be necessary to add a fan if there is reason to believe a fan may be affected by the fire.

Exercise 44

Exercise 45

Exercise 46

Exercise 47

Exercise 48

Exercise 49

Exercise 50

Exercise 51

Exercise 52

Exercise 53

Exercise 54

Exercise 55

Exercise 56

Exercise 57

Exercise 58

Exercise 59

Exercise 60

Exercise 61

Exercise 62

Exercise 63

Exercise 64

Exercise 65

Exercise 66

Exercise 67

Exercise 68

Exercise 69

Module 10.14

This module will look at step eight. If the ventilators in a natural ventilation system are too far apart then the smoke may become stagnant and begin to lose its buoyancy prior to being extracted. To avoid this situation, ventilators should not be located too far apart. This may result in an increase in the number of ventilators being required over and above the quantity to satisfy the AvCv requirement

Module 10.15

This module will look at step nine. In the previous step we determined the minimum number of exhaust points within each reservoir to satisfy the extract requirements, however, this may have to be increased since for any specified layer depth, there is a maximum rate (MCRIT) at which smoky gases can enter any individual exhaust point. Any further attempt to increase the rate of exhaust through that exhaust point merely serves to draw air into the orifice from below the smoke layer. This is generally known as ‘plug-holing’.

Exercise 70

Exercise 71

Exercise 72

Exercise 73

Exercise 74

Exercise 75

Exercise 76

Exercise 77

Exercise 78

Exercise 79

Exercise 80

Module 10.16

This module will look at step ten. It is essential to ensure that provision is made to allow for make-up or replacement air to replace the smoke mass being vented by either natural or mechanical means.
The inlet air may be provided by automatic vents, doors or extract points in other reservoirs. These inlets must be located below the anticipated smoke layer depth and if usually closed, they must open on receipt of the same signal that operates the rest of the smoke ventilation system.

Exercise 81

Exercise 82

Exercise 83

Exercise 84

Exercise 85

Module 10.17

The final step is the post design considerations and is where you considered other issues that may have an effect on the smoke control system. You should consider the effects of the wind on the system along with the effect of tall buildings which may result in natural ventilation systems not being permitted.

Module 10.18

This module will look at the issue of fire loading being introduced into shopping malls.

Module 10.19

This module will look at the issue of Mall Commercialisation

Module 10.20

This module will look at the issue of Fire and Smoke Curtains