Please Help!!!
Please Help!!!
(OP)
Hello everyone,
I was hoping I could get some help with a project I'm making. I was wondering what components I would need to create a circuit that could heat polyurethane glass to a temperature of about 200-250 degrees. Ideally I would like the power source to be a small battery and have a switch that makes the circuit hot. I was wondering what size battery, what type of wire and the wire size, and how to construct the switch. I'm sorry I don't have any knowledge on the subject but was hoping someone might be able to give me an idea on how to begin. Thank you all and I hope to get some positive feedback.
I was hoping I could get some help with a project I'm making. I was wondering what components I would need to create a circuit that could heat polyurethane glass to a temperature of about 200-250 degrees. Ideally I would like the power source to be a small battery and have a switch that makes the circuit hot. I was wondering what size battery, what type of wire and the wire size, and how to construct the switch. I'm sorry I don't have any knowledge on the subject but was hoping someone might be able to give me an idea on how to begin. Thank you all and I hope to get some positive feedback.





RE: Please Help!!!
Gunnar Englund
www.gke.org
RE: Please Help!!!
RE: Please Help!!!
RE: Please Help!!!
Perhaps you were thinking of Pyrex? However, Pyrex is non-conductive, so it's completely unclear how you think your "circuit" is going to work.
TTFN
RE: Please Help!!!
You need to give us a much bigger, clearer picture of what exactly you want to achieve.
RE: Please Help!!!
My first concern first of all is using battery power. In general, heating things using a battery uses a lot of power and drains the battery exceptionally fast. I was looking into using batteries to simply power some resistive elements that would go in a jacket or boots, to make it so that you could be warm while you do work, and the batteries would not last long at all - a maximum lifetime no more than 3 hours for something like this.
Heat simply takes a ton of power. Tell us more about what you want to do, and why you can't use an AC power outlet to power whatever it is you want to build. An electric skillet/bowl? I'm intrigued.
Jim Goebel,
Electrical Engineer
Mid-West Forensics, Inc.
RE: Please Help!!!
For example, a coffee maker can heat 1,750 cubic mm of water up by 40 degrees C with about a half a million Joules assuming an 85% efficiency. Assuming your material heats up 4X faster (easier from the specific heat) than water and your sample size is 220 times smaller and you need to go 5X as far (200 degree C change instead of only 40) you might assume it takes 3000 Joules to get there. If a C-cell can store 10 Watt-hours (36,000 Joules), you should be able to build a device that heats up a very small sample and maintains a temperature of 250 degrees C a few times before the battery is empty.
Best Regards,
John Solar
RE: Please Help!!!
Glass is a container to drink a liquid from, may be made
of glass ( atransparent silicate ) or any number of plastic.
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Please Help!!!
Do we never learn...?
Gunnar Englund
www.gke.org
RE: Please Help!!!
RE: Please Help!!!
RE: Please Help!!!
Here we are talking about one thousand, five hundred degrees!
I would expect this task to take about 100AHrs for one cycle... That's a lead acid battery that takes two strong men to barely move.
RE: Please Help!!!
Now. Give us these facts:
1 Describe what you want to do. Is it to sterilize, analyze, process, or what?
2 Is it a piece of glass or polyurethane that we are talking about?
3 What are the dimensions? I think you said "a nickel" would that be a circular disk around ten millimetres and 1.5 mm thick?
4 What shall the end temperature be?
5 How fast do you need to reach that temperature?
6 For how long shall the temperature be maintained?
7 Surrounding temperature?
8 Will there be any winds or will it be in still air?
9 How many of these devices are you going to make?
10 Are batteries your only option? Or can gas, alcohol or a mains connection be considered?
11 How bulky may such a device be? Give acceptable dimensions and weight.
12 What about cost? Is it a ten dollar device? Or hundred or thousand dollars? Or more?
13 Shall it be used only once or shall it have a certain life-time? If so, how long? Number of uses?
14 Any other pertinent input?
If you take your time and answer these questions, and add information that I haven't thought about asking, then I'm sure that someone in here will help you. But starting the way you did will make many people (me for instance) question the maturity of the OP - or if you have a homework that you want someone else to do.
Student postings are a constant concern in here. For very obvious reasons.
Gunnar Englund
www.gke.org
RE: Please Help!!!
Well put my man!