face velocity การใช้

• If this occurs, the face velocity could drop to an unsafe level.
• For industrial conditions, high face velocities are acceptable.
• For commercial applications like store entrances, user comfort dictates low face velocities, which reduce effectiveness of separation of exterior air from interior air.
• Generally, a thermal wheel will be selected for face velocities between, and with equal air volume flow rates, gross " sensible " efficiencies of 85 % can be expected.
• The most effective air door for containing conditioned air inside a building with an open door will have a high face velocity at the opening, generated by top-down flow, and air recovery by a recirculating air plenum and duct return to the source fans.
• The main cause of increased energy consumption lies with the fan, for the same face velocity, fewer coil rows will decrease air pressure drop and increase water pressure drop but the total energy consumption will usually be less than that for a greater number of coil rows with higher air pressure drops and lower water pressure drops.