| 摘要 |
A device and method for cooling chemical smoke for creating a low lying fog effect comprises first and second chambers arranged in heat exchange relationship, the first chamber comprising an open-ended conduit adapted for maintaining a flow of chemical smoke therethrough, the second chamber adapted for receiving liquid CO2 under pressure and including vent openings for venting gases from the second chamber into the first chamber for maintaining the second chamber at ambient pressure, the liquid CO2 transforming to dry ice in situ, and a liquid CO2 supply system for connecting a source of liquid CO2 under pressure to the second chamber, whereby the chemical smoke flowing through the first chamber is cooled by the dry ice in the second chamber. Thermal sensor means sense the temperature in the second chamber and control a liquid CO2 flow control valve in the liquid CO2 supply system.
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