| 摘要 |
Disclosed is a device for generating and measuring the flow of a gas, the device being particularly adapted for measuring the magnitude of air infiltration in a building and for locating sources of air infiltration. The device of the invention comprises a propeller-type fan for generating gas flow mounted in a gas flow guide, a drive for rotating the fan, an orifice plate located upstream from the fan, a damper or drive controller for varying the gas flow rate through the orifice, and one or more flow-directing vanes between the orifice plate and the fan, the plane of the orifice plate being approximately parallel to the plane of rotation of the fan, and the orifice and fan being generally concentric and spaced less than one fan diameter apart. The device further comprises a housing enclosing the space between the orifice plate and the fan, a pressure-sensing probe projecting into the housing and located near the orifice plate and between the orifice plate and the fan, and a pressure differential sensor for measuring either the pressure difference between the probe and the static air upstream of the orifice, or the difference in static air pressures downstream and upstream of the device. Also disclosed is a method for determining the magnitude of air infiltration in a building and locating air leaks which utilizes the above device.
|
