| 摘要 |
A system for refrigerating a freezer room or tunnel by utilising a source of liquid carbon dioxide which is injected through a nozzle 56 to form a primary stream 66 within an elongate hollow enclosure 72. The enclosure is mounted with its inlet end spaced about the nozzle to define a circular opening 74 through which an annular stream of ambient gas from within the room is entrained by the primary stream. The ambient gas turbulently intermixes with the injected coolant for subliming any solid carbon dioxide or snow so that the resulting stream exhausting from the circular outlet 76 of the enclosure is free of snow. A predetermined relationship between the size of the enclosure inlet and nozzle orifice 64 is established to expand the coolant in an outwardly diverging pattern. A metering valve 36 controlling flow of the carbon dioxide is responsive to the temperature within the room and is pneumatically operated. <IMAGE> |
