Mineral Oil Heat Dissipation

[Xittenn]

So this is a complimentary thread to Building a HV AC Capacitor. The capacitor being built in this thread was plexiglass with aluminum foil plates immersed in mineral oil in what I would assume to be a baby jar. So I thought hmm what a great way to try to do some physical chemistry maths. Here is the perfect opportunity to model heat transfer and dissipation for a practical purpose. I have all the equations and would like to give it a try. I have however none of the info on glass(I would have to assume a commonly used type,) mineral oil and plexiglass; aluminum is easy to find. So before I actually try to do this for the practical purpose of letting the composer of Building a HV AC Capacitor know how dangerous the heats produced by a 300watt capacitor are(if at all,) could anyone point me to an online database of heat capacities and transfer rates? Or whatever would be deemed sufficient in accomplishing this task, I have a lot of equations at my disposal.

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I can't find an ESR either hmmmmmmm I might have to equipartition and generalise. There has to be somewhere to find this stuff online?

 

http://www.engineeringtoolbox.com anything better?????

Edited February 13, 2009 by buttacup
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[CaptainPanic]

Those kinds of data are notoriously hard to find online, or even in literature. I run into such problems with work all the time.

 

I checked Perry's Chemical Engineers' Handbook for you, but I found nothing. There are specific heats and also heat transport coefficients in that book, but none for plastics or mineral oils.

 

To my surprise however, the wikipedia entry for polycarbonate (which is not plexiglass (plexiglass = PMMA), but might come close enough) is very good. It contains both heat transfer coefficient and heat capacity.

 

I didn't search for the oil. Is that silicon oil that you're planning to use?

 

[edit] If you stir the oil, then at least you know for sure that the heat will be distributed rather uniformly in the oil... might make your model a lot easier. If cooling is your goal, then I'd even recommend it.

Edited February 13, 2009 by CaptainPanic
adding the comment starting with [edit] :-)

[Xittenn]

 

I didn't search for the oil. Is that silicon oil that you're planning to use?

 

 

I'm not building it just replying to a gentlmen who posted with some details on what he's attempting to do..........but thanx a bunch anyway, much appreciated!

 

I'll try to post a reasonable model this weekend, maybe you could take a boo at it.

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Wow I expected this to be really easy. I assumed there would be databases upon databases of fifty varieties of glass with general compositions their specific and molar heat capacities, enthalpies, heat conductance etc. and yet nothing. I figured I could do a broad generalization but the best broad generalization would be mineral oils are good coolants just use Pyrex glass and all will be fine! I'm somewhat disappointed here.............. What's the normal approach buy the material and hope to God the data sheets contain all pertinent? I mean I guess this is what I do, if a coolant is needed that is no longer available I search for the next most similar and check the specs.......I just assumed this would all be compiled information generally and readily available to all.

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It would be knid of nice to see a model though............