| 摘要 |
A high-velocity plume of snow produced by mixing streams of a compressed medium, e.g., chilled compressed air and/or liquid nitrogen, and cold water is used as a washing stream, e.g., as a replacement for mechanical scrubbing elements in a car wash. A microprocessor monitors the relevant conditions in the car wash tunnel, e.g., the temperature, barometric pressure, and humidity, and controls the temperature and pressure of streams of water and compressed medium to ensure efficient production of snow; nucleating particles, detergent, and/or wax can also be supplied if necessary. In one preferred embodiment, a plurality of snow guns are mounted on posts extending up either side of and across the top of the wash tunnel, so as to reliably blast each square inch of the vehicle's surface. The posts may serve as manifolds for water, air, or both, and may be reciprocated along their axes and also rotated back and forth, to ensure full coverage. Preferably the water is recovered and used to chill the compressed air, which may also be fully or partially recovered. A cleansing snow blast produced according to the invention can be provided by a portable device.
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