Help me fix my window demister!

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Petebass
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Help me fix my window demister!

Post by Petebass » 13 Mar 2018, 12:06

You guys are a pretty smart bunch so maybe someone can help me out here.....

Long story short, one of my display freezers in my ice cream shop has a problem, and the quote I got to fix it "properly" would send me bankrupt. It still works, and for the most part I can work around the fact not isn't going to defrost as well as the other display freezers by making sure it's emptied and switched off overnight. No biggie there.

However, as far as my customers are concerned, the front glass will not "demist" itself properly at present. I have to wipe it down manually from the inside so the customers can see the ice creams properly. I tried installing a little fan to blow air onto the glass and that works, but it disrupts the airflow too much insode the freezer and the ice cream quality suffers no matter how I position it. Adding a timer so it's not constantly blowing helped, but it's still not working as well as what I'd like.

So I googled and googled and can upon a mob that sell aftermarket window defrosters. Their target market seems to be people with vintage cars which didn't originally come with a rear window defroster. You roll it onto the window, remove the backing paper, and what remains is the little orangey brown lines that make up a modern car rear window demister. I got to thinking about doing this to the inside window of my display freezer, then running a 12v power supply to if from a transformer plugged into a power point. Here's their link:-

https://www.frostfighter.com/clear-view ... -about.htm

I asked them via email if this would work, but they seem to be too busy to reply. Either that or they don't know. I can't see why it wouldn't? 12V is 12V isn't it? The only issue I can think of is that a car demister usually only has to operate for 10-15 mins but I'll have mine on all day. Is that going to be a problem? Do I need to adjust voltages to compensate? Or should I do like I'm doing now with the fan and just run the 12V power through a timer that turns it on and off periodically?

Your thoughts?
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Wrenn
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Re: Help me fix my window demister!

Post by Wrenn » 13 Mar 2018, 12:22

I don’t know if it’s applicable to you but I apply RainX with chalk eraser on the inside of my car windows and it works for weeks.
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Re: Help me fix my window demister!

Post by Petebass » 13 Mar 2018, 12:24

Wrenn wrote:
13 Mar 2018, 12:22
I don’t know if it’s applicable to you but I apply RainX with chalk eraser on the inside of my car windows and it works for weeks.
Tried that. It's not so invisible at -18 degrees as it is at more sane temps.
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Re: Help me fix my window demister!

Post by BazzBass » 13 Mar 2018, 12:35

Totally impractical, but put windscreen wipers on the inside . Would certainly be a talking point :)
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Re: Help me fix my window demister!

Post by tearalong » 13 Mar 2018, 12:56

Or should I do like I'm doing now with the fan and just run the 12V power through a timer that turns it on and off periodically?
this would be the way to go.
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Re: Help me fix my window demister!

Post by slowlearner » 13 Mar 2018, 13:09

Petebass wrote:
13 Mar 2018, 12:24
Wrenn wrote:
13 Mar 2018, 12:22
I don’t know if it’s applicable to you but I apply RainX with chalk eraser on the inside of my car windows and it works for weeks.
Tried that. It's not so invisible at -18 degrees as it is at more sane temps.
Shaving cream. ;)
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Re: Help me fix my window demister!

Post by Aussie Mark » 13 Mar 2018, 14:33

Soap works on the bathroom mirror

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Re: Help me fix my window demister!

Post by Petebass » 13 Mar 2018, 15:02

Aussie Mark wrote:
13 Mar 2018, 14:33
Soap works on the bathroom mirror
Tried that too with both soap and dish washing liquid. Doesn't work at -18.

Which reminds me, I have to get some isopropyl alcohol and make up a spray that'll melt the fluffy icicles that form inside the freezer now.
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Re: Help me fix my window demister!

Post by slowlearner » 13 Mar 2018, 15:14

Hmm, have you tried wiping it with a dead kangaroo tail?


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tearalong
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Re: Help me fix my window demister!

Post by tearalong » 13 Mar 2018, 15:25

This is listed as a hyrdophillic fluorosilicone polymer surfactant that lasts for 20 days

https://www.aliexpress.com/item/Automob ... 85494.html
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Petebass
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Re: Help me fix my window demister!

Post by Petebass » 13 Mar 2018, 15:32

tearalong wrote:
13 Mar 2018, 15:25
This is listed as a hyrdophillic fluorosilicone polymer surfactant that lasts for 20 days

https://www.aliexpress.com/item/Automob ... 85494.html
And the button is Humanised :)
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packrat
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Re: Help me fix my window demister!

Post by packrat » 13 Mar 2018, 18:03

One note. The demister things can burn out if you run them on dry glass where they're not gently boiling water droplets away to shed heat (burn out here, meaning melt plastic substrate). I'm not sure they work that well if there isn't lots of free air to take that water vapour, but they should work to get your glass warm enough that it won't condense water out of the cold air.

However, if you have nice warm glass, will the airflow in the freezer be pushing up and over it to the point where you end up heating the the air inside, or fighting against the freezer?

Another consideration (and I have no insights into their construction), these demisters are usually specced to go on the dry inside of the car, not out in the wet bit, but if you put them on the dry side of the glass, a child is going to put their finger on the hot wire sooner or later. This seems bad. They also look fragile for cleaning, maybe a problem in a food service thingy.

B>

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Petebass
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Re: Help me fix my window demister!

Post by Petebass » 13 Mar 2018, 19:03

packrat wrote:
13 Mar 2018, 18:03
However, if you have nice warm glass, will the airflow in the freezer be pushing up and over it to the point where you end up heating the the air inside, or fighting against the freezer?
The freezer itself already has a mechanism for heating the glass, but it went down when the faulty evaporator started causing the machine to constantly trip my safety swich / circuit breaker. I guess it burned out.

I just noticed one of my other display freezers (of a different brand) actually has thin orangey/white lines on the inside glass to heat it. They're very thin, but they're there.

So I guess the concept itself won't be a problem. I'm thinking that instead of a 12v power supply, I might use one of those variable voltage ones that I already have lying around. That way of 12v seems to get too hot, I can change the voltage to 9V, or 7v, 6v, 5v, 4v, or 3v to get a temp that works best.

I think I've just talked myself into it ...........................
packrat wrote:
13 Mar 2018, 18:03
They also look fragile for cleaning, maybe a problem in a food service thingy.
If this was going on the outside of the glass, then yes, those windows get very grubby very quickly (kids and their fingers)and are cleaned many, many times a day. The inside glass actually stays quite clean. Fingers never touch it. Food never touches it, other that the occasional unintentional spash upwards. They're rare, and are easily cleaned without any hard scrubbing. Just windex on a soft microfibre cloth. I'll have to make sure my staff know to be extra gentle.............
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Re: Help me fix my window demister!

Post by basshack » 13 Mar 2018, 19:29

Pete, can you find 2nd hand glass panes to match what you have. Those heated windows are usually current controlled so that they don't overheat when they are not needed to warm up the glass. Putting variable voltage heaters in will do a similar thing but how are you going to monitor it? It'll change with the amount of fresh, therefore wet, air going in.
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Re: Help me fix my window demister!

Post by brooksi » 13 Mar 2018, 19:56

slowlearner wrote:
13 Mar 2018, 15:14
Hmm, have you tried wiping it with a dead kangaroo tail?


...oh sorry. Wrong post. :D
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