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Disaster Advice Glossary
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Disaster recovery and restoration can be veiled in mystery to the many who have not undertaken specific training. This glossary explains technical terms to assist both report writing and the understanding of those technical terms so often misunderstood.
Definition
| Advection: |
In water damage mitigation, the transfer of cold, heat, moisture, particles and other properties in air by the horizontal motion of a movement of dynamic air. See Acceleration Velocity, Convection |
| Aeration: |
In water damage restorative drying the process by which dryer air is artificially introduced into wet building materials and contents, allowing some building materials and contents to dry faster. See Air Movement, Air Dynamics, Acceleration Velocity, Advection, Turbidity |
| Air Movement: |
Restorative Drying Note: In wet building drying the ability to move (force) large amounts of dryer air across wet surfaces, allowing liquid water to become moisture vapour, which is then exhausted or dehumidified. See Advection, Aeration, Airmover, Dynamic Pressure, Turbidity, Air Currents |
| Cyclone Effect: |
The air in a room which is forced through dynamic pressure to move in one direction. Mitigation Note: In water damage mitigation, it is the dynamic pressure of ambient air forced across wet walls in a room at about 45 degrees, resulting in the release of moisture on wall materials and flooring. The cyclone effect (winds moving around and towards the same direction) causes turbidity air currents. See Advection, Eddy Currents, Dynamic Pressure, Static Pressure, Turbidity Air Currents |
| Dynamic Pressure: |
Having to do with forced energy and motion, also known as kinetic pressure, or kinematics, the study of motion without reference to forces. Education Note: In water damage mitigation, dynamic pressure is the bulk flow of forcing trapped moisture in building materials from a liquid to a vapor. Once dynamic pressure can be accomplished, wet air in buildings should be exhausted and exfiltrated, through removal or dehumidification. See Advection, Exfiltration, Static Air, Turbidity Air Currents |
| Turbidity Air Currents: |
As wet buildings are concerned: Restorative Drying Note: a) The process of taking saturated wet building materials, with dynamic air and vaporizing moisture into the air through advection. b) One accepted method, is to use turbo fans (2,000 cfm fans or greater) forced across wet building materials that will release static-trapped moisture to an airborne vapor state. c) Turbo fans are to be placed in such a manner as to create a cyclone effect in a room. d) The use of dehumidifiers is almost always necessary to reduce the increased humidity rapidly. See Advection, Cyclone Effect, Dehumidification, Dynamic Pressure, Eddy Current, Static Pressure |
| Vapourization of Fire Department Water: |
During a building fire event, the fire department uses large amounts of water from fire hoses to reduce and eliminate the flame and the flammable source. Contractor Note: The heat from a fire in an enclosed atmosphere, will allow a stream or spray (fog) of water to expand up to 1,700 times its mass from the waters original dispersion size. This results in liquid water to turn into steam water droplets, then the droplets are changed into a moisture vapour state. (With extremely hot-heat, water from a fire hose immediately goes to the vapour state). With heat, vapourized water and cooler building material surfaces, the building materials absorb the water vapour rapidly, and often the water vapour is actually forced into porous cells of the building matrix through advection and conduction. Dehumidification of a wet building from a hot-fire is complicated by the radical dispersion of vapourized moisture molecules in building materials, along with the atmospheric stresses brought about from heated forces of increased air volume. See Absorption, Advection |
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