I am looking to maybe buy a Fridge Deodorizer Freshener Air Purifier using ozone:
from zapalas
Have you ever used one? Are any good?
Any advice or comment will be appreciated…
Thanks
Cris
Ozone Based Fridge Deodorizer Freshener Air Purifier - Anyone Using?
cristtos on 27/02/2017 - 09:59
Comments
Thank you for your comment.
Aren't the ozone generators widely used in swimming pool water conditioners?
http://www.directpoolsupplies.com.au/ozone-generators
I would have expected those would be banned if there was some sort of legal issue…
just because something isnt banned doesnt mean it isnt/cant be harmful
Think cigarettes
known cause health issues but not bannedor alcohol or junk food or list goes on
Not sure about the restrictions. I'm sure I read something about them being restricted (not necessarily banned) but not sure which state (or maybe even country) I was reading about (sorry, I realise this is a fairly useless contribution).
The health risks are more clear though. I notice on your link to the pool ozone generators it says:
However, as ozone is also toxic, all traces must be used or removed prior to reaching the pool.
Not sure I'd want the same substance in my fridge.
Yeah, Ozone is not a good idea to add to your food.
Heaps of reasons why it's a bad idea..
1) Ozone makes the air smell burnt.
2) It will also ozidise EVERYTHING.. So any metal components will be corroded, rubber and plastics will yellow and become brittle over time, and your food will go off faster.In short it's a terrible idea with way more negatives than benefits..
Why is your fridge so smelly that you're even considering this "solution"?Clean your fridge if smells are truly a problem.
Warning Terrible Maths ahead!
Just looking at the specs, I can't see how a 4400mAH battery could generate Ozone for more than a few hours.. And certainly not the claimed 35 days.
Even then it's not going to produce very much. Ozone is pretty energy intensive.
Assuming that 4400mAh battery is rated as such at 5V (in reality, probably actually only at 3.7V), 22Wh of power available to completely drain the battery.
According to http://www.science.uwaterloo.ca/~cchieh/cact/applychem/ozone…
the enthalpy of formation of ozone is 142.7 kJ / mol.
142kJ = 39.4Wh (according to http://convertilo.com/142-kilojoules-to-watt-hours )
So the battery is theoretically capable of creating a bit over 0.5 mole of Ozone if it could convert 1:1 which is not possible.
Assuming the system is only 50% efficient (likely way less), that's 0.25 mole of Ozone from a charge.
It's bad to discharge Lithiums completely, so let's recharge at 30% like we ought to, so we get 0.175 moles/charge.1 mole of gas at 25C and at sea level = 22L
A standard fridge is 500L = 23 moles of air.
16% of air is Oxygen = 3.7moles oxygen..
Let's aim at 1% ozone = 0.0368 moles Ozone at any time in the fridgeNow every time we open the door the Fridge air is replaced 50% with fresh air..
ie every time we open the door, we need to generate 0.0184 molestherefore I think the unit is capable of generating Ozone at 1% in a 500L fridge
1 time initially (0.0368 moles)
and subsequently no more than for 8 further door openings.
Assuming that Ozone doesn't deplete over time - which it will, and quite rapidly.If you open your fridge door less than 8 times in a 35 day period.. maybe the stated battery life might hold!
It's a '4400mAh' battery (who knows how much capacity it really has), and has to operate in a cold environment, further reducing battery life.
1% Ozone appears to be WAY too much…
This EPA document talks about antibacterial effect of ozone at 6 to 10 PPM.
my2cIt's not completely clear, but my 1% is 1% of the Oxygen, so only 0.16% of the total volume or, assuming all air molecules are the same mass (VERY rough assumption) 16000ppm.
I'm also assuming that the Ozone won't rapidly deplete (which it most certainly will). According to here
http://www.lenntech.com/library/ozone/decomposition/ozone-de…
it has a half life of around 5-6 days in dry air. that's also assuming it's not reacting with anything, which is will quite freely.
Sounds like a terrible idea. Not really comparable to using ozone in a pool as the ozone is removed before it hits the pool. Having ozone swirling around your fridge, oxidising any metal (and your food) and then having a huff of it when you open the fridge doesn't sound ideal. Clean your fridge and put an odour absorber (activated charcoal I assume) in there if it is still bad.
Wikipedias entry:
In the U.S., air purifiers emitting low levels of ozone have been sold. This kind of air purifier is sometimes claimed to imitate nature's way of purifying the air without filters and to sanitize both it and household surfaces. The United States Environmental Protection Agency (EPA) has declared that there is "evidence to show that at concentrations that do not exceed public health standards, ozone is not effective at removing many odor-causing chemicals" or "viruses, bacteria, mold, or other biological pollutants". Furthermore, its report states that "results of some controlled studies show that concentrations of ozone considerably higher than these [human safety] standards are possible even when a user follows the manufacturer’s operating instructions".
"Atongm KT-6830 Fridge Deodorizer helps you remove the undesirable odor, pesticide residues and reduce the level of bacteria in the fridge."
Pesticide residues? Honestly, if your fridge is contaminated with pesticides, I suggest a thorough cleaning rather than installing a tiny ozone generator.
This device looks like snake oil for the gullible.
Thank you for all your comments.
The observation about oxidising everything is probably the most powerful.
I believe plastics (polymers) are sensible to this kind of stuff as well and will become fragile and crumbly because of that.Based on this discussion I have decided to forego this planned purchase.
I know this is a post from 2017, but the EPA regulation of Ozone for plant use is it has to be less than 0.065 PPM over an 8 hour period.
Are you legally allowed to use them in Oz? I thought there were restrictions as ozone has adverse health effects: http://www.health.nsw.gov.au/environment/factsheets/Pages/oz…
Though maybe a fridge sized one isn't big enough to cause concern.