alluminum block
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From: elahetal on 14 Jan 2010 15:02 Hello all, If I need an Al Block to heat up and I need the least possible dimensions but I need to increase its temperature from ambient temp(20 degree) to 60 degree. how many watts I need and what the dimensions should be? I do not know from which point I should start. Thanks
From: Tom Biasi on 14 Jan 2010 16:21 "elahetal" <elahetale(a)yahoo.com> wrote in message news:1cednUIyaMjf5dLWRVn_vwA(a)giganews.com... > Hello all, > > If I need an Al Block to heat up and I need the least possible dimensions > but I need to increase its temperature from ambient temp(20 degree) to 60 > degree. how many watts I need and what the dimensions should be? I do not > know from which point I should start. > > Thanks > > You need to start with more specific information.
From: Greg Neill on 14 Jan 2010 16:52 elahetal wrote: > Hello all, > > If I need an Al Block to heat up and I need the least possible dimensions > but I need to increase its temperature from ambient temp(20 degree) to 60 > degree. how many watts I need and what the dimensions should be? I do not > know from which point I should start. What parameters are fixed besides the material of the block? Or at least, what are their reasonable ranges? Some things you haven't specified: 1. How is the block heated? Is heat applied to one side, the inside? All sides? What's its efficiency in getting its consumed power into the block as heat? 2. What medium is the block in? What is the size of the ambient region? 3. Is the block in contact with anything else? 4. Is the block coated with anything? 5. What temperature scale are you using? 6. How long should it take to heat the block to 60 (C? F?) 7. How much heating power is available? Is the block supposed to remain at 60 (C? F?) for as long as heat is being applied, or is there a temperature controller?
From: Sjouke Burry on 14 Jan 2010 17:05 elahetal wrote: > Hello all, > > If I need an Al Block to heat up and I need the least possible dimensions > but I need to increase its temperature from ambient temp(20 degree) to 60 > degree. how many watts I need and what the dimensions should be? I do not > know from which point I should start. > > Thanks > > Check wirewound or power resistors. They come already sealed in an aluminium block. Problem solved.
From: bg on 14 Jan 2010 17:17
elahetal wrote in message <1cednUIyaMjf5dLWRVn_vwA(a)giganews.com>... >Hello all, > >If I need an Al Block to heat up and I need the least possible dimensions >but I need to increase its temperature from ambient temp(20 degree) to 60 >degree. how many watts I need and what the dimensions should be? I do not >know from which point I should start. > >Thanks > > Materials have a thermal resistance which is simply stated as watts per degree. For example if your block has a thermal resistance of 1 watt per degree, then 40 watts input will raise the temperature 40 degrees over ambient. As you can see there are watts, degrees and thermal resistance so any one of those quantities can be juggled to get the desired results. Thermal resistance will depend on several things such as the size and shape. It would be much easier to take a block of suitable dimmensions, dump power into it and measure the temperature rise. |