Steam Jet Refrigeration ??

[hvacfella]

I remember in Trade School, having to give a short 10 minute speech on Steam Jet Refrigeration for comfort cooling. These were around during the 1930-1940's for comfort cooling, and, looks like they are still around for process cooling now. Was wondering if any of you have worked on these and can share the pros and cons to this type of unique system ? What sort of vaccuums are typically run in the evaporator to achieve say... 44 f. chilled water ?

Thanks.

http://www.jmpedroni.com/Pedroni/images/refrigeracion.gif

[cool frog]

i've only read about steam jet cooling. so with that said i'll give my opinions for what there worth. the pros are i would think is ease of operation-little or no moving parts. and if waste steam is available it's for free. the cons are its not efficient. you need to use alot of energy for the end result.yes , i did say if waste steam is available its for free. but absorbers i would think are more efficient. as for the pressures- they work almost like an absorber. water or r718 is used as a refrigerant and must be boiled off at about 42 deg.f for 44 or 45 deg.f cilled water. so look up a p.t. chart for water,mine is in my truck right now with my wet bulb indicator. so it runs down into a pretty low vacuum to achieve this.and the steam jet creates this vacuum. hope this helps, i would love to see one.

[coolwes]

I have never worked on them but understand that the railroad used them back in the steam engine years to cool the cars.
The jet pump could produce very low pressures in the range of 6 to 7 mm Hg. which resulted in 40 to 45 evap. temp.