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 Posted: Mon Nov 26, 2012 2:00 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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As the title really. I'm doing my final year project for uni. I'm designing a remote controlled de-icer for the front windscreen. I'm looking at using resistive wires and would like to know whats used on the back window.
Any help is much appreciated 
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Posted: Mon Nov 26, 2012 2:09 pm |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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I think that's a difficult one.
The shape and type of metal used for the element is calculated to get the right resistance and power (heat) dissipation.
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Mon Nov 26, 2012 2:14 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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Yeah, the front will be different type of wire. Just thought knowing the rear swg would be a good start as I would then roughly know the distance of the elements so I can make some experiment models.
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Posted: Mon Nov 26, 2012 2:21 pm |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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The ords with the heated front screen have a wire that fine that you can hardly see it. The element itself is in with the laminate.
You used to be able to buy heated rear window kits. Not seen one for ages, but I think Linwood or Harry Moss used to do one
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Posted: Mon Nov 26, 2012 2:25 pm |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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You will need 'resistor-wire' of specific Ω/m.
Then, decide how many Watts of power you want say eg. 60W.
So at 14V (engine running) you would get 60/14=4.2 Amps and this would require 14/4.2=3.25 Ω roughly.
Divide this by the wire Ω/m rating of the wire and you get length in meters needed.
I still think it's a difficult one to implement in practice.
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Mon Nov 26, 2012 2:34 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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| macca1411 wrote: |
The ords with the heated front screen have a wire that fine that you can hardly see it. The element itself is in with the laminate.
You used to be able to buy heated rear window kits. Not seen one for ages, but I think Linwood or Harry Moss used to do one |
Thats the idea, have the element fixed in laminate and then that will fix to the windscreen. As a heated windscreen is nothing new, I'm concentrating on the wireless communication to activate it.
| V9977 wrote: |
You will need 'resistor-wire' of specific Ω/m.
Then, decide how many Watts of power you want say eg. 60W.
So at 14V (engine running) you would get 60/14=4.2 Amps and this would require 14/4.2=3.25 Ω roughly.
Divide this by the wire Ω/m rating of the wire and you get length in meters needed.
I still think it's a difficult one to implement in practice. |
It needs to be somewhat difficult to be able to get the marks for research and design. Its definitely achievable
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Posted: Mon Nov 26, 2012 2:39 pm |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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What about switching the vent fan on with an add-on electric heater resistor, all controlled by a relay-remote setup?
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Mon Nov 26, 2012 2:42 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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That is another of my solution choices. You are like a mind reader!  At the moment i am in the selection stage. I'm researching resistor wire to see how it could be implemented and what I would need. At the moment I am trying to find out what Ford use in their windscreens.
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Posted: Mon Nov 26, 2012 2:42 pm |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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The simple answer for the wireless communication would be a RF transmitter/receiver setup similar to the remote starter kits.
You would also have to look at a thermal cut off and a timed cut off for safety, and possibly a low battery voltage interrupter circuit so if the voltage drops below 12v it shuts down the heated screen and you are still able to start the car. Last thing you want is a defrosted screen but not enough juice in the battery to drive anywhere.
| V9977 wrote: |
| What about switching the vent fan on with an add-on electric heater resistor, all controlled by a relay-remote setup? |
I used to have a little 12v ceramic fan heater in my 205. I could do a 40 mile motorway run and the car temp never went up enough in freezing conditions to create any heat, so I kept warm with this heater. Damn crappy Peugeots
This is one similar to what I had, but it didn't have the cool air setting
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Last edited by macca1411 on Mon Nov 26, 2012 2:49 pm; edited 1 time in total
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Posted: Mon Nov 26, 2012 2:48 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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Yeah, got that kind of stuff on a brain storm thing. I was thinking about using a separate power supply. But I'm not that far into my research yet.
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Posted: Mon Nov 26, 2012 2:50 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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| V9977 wrote: |
| What about switching the vent fan on with an add-on electric heater resistor, all controlled by a relay-remote setup? |
| macca1411 wrote: |
I used to have a little 12v ceramic fan heater in my 205. I could do a 40 mile motorway run and the car temp never went up enough in freezing conditions to create any heat, so I kept warm with this heater. Damn crappy Peugeots
This is one similar to what I had, but it didn't have the cool air setting |
The heater in my old 205 was awful. It was nasty driving that thing in the winter. Temp turned right up with no effect!
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Posted: Mon Nov 26, 2012 2:53 pm |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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Separate power supply would need to be recharged somehow. You could take a feed from the alternator, but that would affect your normal battery, and you also have to find a position for the second power supply. Maybe look at solar charger. Normally when we have an icy night, we get a day of sunshine. You know how everyone likes to be "green" nowadays, maybe extra marks for being eco-friendly.
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Posted: Mon Nov 26, 2012 2:55 pm |
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Joined: Feb 08, 2010
Posts: 819
Trade Rating: +7
Location: Southampton
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I appreciate you guys helping out
Solar is a great idea, I hadn't thought of it! It's going in my logbook
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Posted: Mon Nov 26, 2012 8:22 pm |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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What is it you are studying mate?i have loads of good ideas/ inventions and i could put one or two your direction if i know what subject you specialise in....it would be pointless passing on ideas for lighting say,when your studying mechanical engineering.
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Posted: Tue Nov 27, 2012 5:12 am |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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My mind-reading is not very good today but I would say: 2nd year EEE?
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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