Not quite 'Hints from Heloise' but someone in the lab had run out of Dust-Off (canned air). I offered my can of freeze spray and told him to just hold it upside down, give a quick spray to clear out the liquid from the pickup tube, and then it would just be gas. AFIK, it's the same HC134 fill used in both products. Only difference is that freeze spray has an internal pickup tube that dispenses liquid from the bottom of the can while Dust Off takes gas from the top of the can. Conversely, if you need circuit chiller and have only dust off, turn the can upside down...
yeh it is r134a, same as in your fridge or aircon, but for some reason there it has all kinds of regulations
considering is has global warming potential of 1300 it is strange that you can still get it for applications where it is just let out in the atmosphere
yeh it is r134a, same as in your fridge or aircon, but for some reason there it has all kinds of regulations
considering is has global warming potential of 1300 it is strange that you can still get it for applications where it is just let out in the atmosphere
-Lasse
_________________
You mean that if I buy a bunch of it and spray it all around, it will be a warmer winter?
R12 was far worse in terms of ozone damaging. R22 was not as bad and was still used long after R12 was banned. I can get HC134A tor my car A/C from the auto parts store no problem. Go to a refrigeration supply store and they can't sell it to you unless you produce an EPA license to handle refrigerants.
Be that as it may, freeze spray for circuit testing beats using butane or propane liquids.
A small CO2 fire extinguisher costs about the same as a bottle of freeze spray, and it's way, way colder. Plus it brings back memories of high school. ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Gee, my school had only the pressurized water extinguishers that you had to turn upside down and shake. I believe that there was baking soda (or another alkali) dissolved in the water and a cup of acid below the top that would mix and create the pressurizing CO2 when upended.
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Speaking of CO2, went by Whole Foods in White Plains, NY the other day and saw a tank truck unloading liquid CO2 to a pipe connection by the street. Wonder what they use it for?
"Oppie" wrote in news:07Twq.41685$ snipped-for-privacy@newsfe01.iad:
Dry ice;for food storage. some stores sell dry ice around Halloween,you put a small chuck in a bowl of water or the punchbowl,and it gives it the "vapors";spooky! makes it real cold and bubbly too.
bright idea;
you can buy small CO2 cylinders of various sizes marketed for paintball; there are some kits sold to use them for small air tools like brad nailers,for portability. just adapt a blow nozzle to the kit.they use standard connectors.
Hmm,you could also power one of those dental/hobby air grinders.
Then there was that day of boredom when I was using one of those propane weed burners that runs from a 20lb barbecue tank. After taking care of the weeds coming through my gravel driveway, I had the dumb idea to leave the burner on low pilot and INVERT the tank... Hit the lever and shot a flame of liquid propane 20 feet. Did it just once for effect. It scared the crap out of me!
It is extremely stupid that they will sell 134a to vent to the atmosphere, but put restrictions on it to charge your air conditioner. I heard that Ca lifornia may put restrictions on R134A sales at auto parts stores, yet you can still buy a can of freeze spray. It's OK to blast it out in the atmosp here, but it's NOT OK to put it into a sealed system where it MIGHT leak ou t, or if you do it right it can be recovered and recycled?
GM is actually testing out a new refrigerant, HFO-1,2,3,4-YF, and put it in most 2013 Chevy's. However, they are still ironing things out because the y did a test where a fireball shot out during an accident test! (probably the oil aspirated that caused this).
For a while they made this stuff called HC-12a, which is isobutane, butane, propane, etc. Great stuff, colder than R12, can be put in R12 systems w/o any retrofitting, more energy efficient, very "green" and a great refriger ant. However it was banned for use in refrigeration for obvious reasons (p ut it in your car, you get in an accident where the evaporator cracks and i t burns your face off for instance).
Dust off is actually difluoroethane, (R152A), and R134a is 1,1,1,2 tetraflu oroethane. I heard of someone charging their car w dust-off, and it worked great, however I am a little worried about putting it in my car as it has this bitterant in it, to keep kids from huffing it.
I live in Washington, and I have to say global warming has made the weather paradise here in the summer (great summer, 72 degrees average temp in Seat tle, sunny). Was always rainy and cloudy growing up. Destroying the rest of the world, but great weather here. No wonder they're building so many a partments, condos, and town houses as everyone want's to live here now :)
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