Chapter 3 - environmental controls

Question 1

Describe dehumidification.

Answer 1

Dehumidification is the process of removing moisture vapour from the air to lower its dew point.

Question 2

When planning enclosures, the following minimum requirements should be considered?

Answer 2

Must be large enough to contain the whole work area.
It be larger than the performance capabilities of the dehumidification equipment.
Be sturdy enough to hold up to intended work activities, potential loads, and possible inclement weather..
Have minimal leakage to maintain proper environmental conditions and ensure the dehumidification system operates efficiently.

Question 3

Describe air turns ( air changes).

Answer 3

The air turnover principle eliminates air stratification, or layering, in large open spaces by recirculating the hot air that becomes trapped in the higher spaces.
The number of times it does this per hour is called air turns.

Question 4

At and below what relative humidity does corrosion virtually ceases?

Answer 4

40%

Question 5

Describe two ways to reduce the relative humidity of the boundary layer.

Answer 5

Increase the surface temperature.

Reduce moisture content by dehumidification.

Question 6

Types of dehumidification equipment include.

Answer 6

Refrigeration and desiccant.

Question 7

Describe several benefits of dehumidification.

Answer 7

Dries the air. Lowers the dew point. Permits blasting the entire surface. Holds the blast with dry air. Helps in cleaning the surface. Holds the surface during coasting application.