Ultrasonic2 (muffy) has a calculator somewhere....
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Ah now those should be handy links. I already have Ultrasonics calculator I just wanted a slightly different perspective.
Originally Posted by ira-k  Just guessing you would be pulling around 6 -8 amp's at 6vdc, that would be around 36-48W for each TEC. Heres are the formulas for it if you want to do them..Device Performance Formulae ...And a cheat.Ohms Law Calculator Just look around and see if you can find his calc to find out for sure. |
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Heres the whole handbook those formulas came from .Melcor - Thermoelectric Handbook ..Its PDF, good info on the mechanics of mounts and all that also you might want to down load it.
Originally Posted by flak-spammer Ah now those should be handy links. I already have Ultrasonics calculator I just wanted a slightly different perspective. |
Heres the whole handbook those formulas came from .Melcor - Thermoelectric Handbook ..Its PDF, good info on the mechanics of mounts and all that also you might want to down load it.
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If your planning that for a chiller I have a suggestion and it's a bit cheaper at least !!!
get the 26316 units from Hebei I.T.:- http://www.hebeiltd.com.cn/peltier.d...C1-26316HT.pdf
If you want to know the figures go to:- http://www.ferrotec.co.uk/index.php?...ail&mod_id=118
These charts are for a 242 couple unit but you just need to adjust the figures by 263/242 = 1.0867 the easiest way is to first determine what voltage you plan to use then multiply the voltage by 1.0867 and then read all the stats from that voltage but actually run at the voltage you first thought of. Don't forget to adjust the hotside temp figure just under the charts.
If you really do plan to use 8 undervolt them to 7v - read off the stats for 8v (you'll be close enough for ballpark.) should be able to 560w pump for about just under 250w in. Coldside 10-15º for an ambient in low 20's.
or perhaps even run them at 6v.
I believe these are fairly conservative figures.
Originally Posted by flak-spammer What is the Qmax at 27C hotside? That's what I wonder. |
get the 26316 units from Hebei I.T.:- http://www.hebeiltd.com.cn/peltier.d...C1-26316HT.pdf
If you want to know the figures go to:- http://www.ferrotec.co.uk/index.php?...ail&mod_id=118
These charts are for a 242 couple unit but you just need to adjust the figures by 263/242 = 1.0867 the easiest way is to first determine what voltage you plan to use then multiply the voltage by 1.0867 and then read all the stats from that voltage but actually run at the voltage you first thought of. Don't forget to adjust the hotside temp figure just under the charts.
If you really do plan to use 8 undervolt them to 7v - read off the stats for 8v (you'll be close enough for ballpark.) should be able to 560w pump for about just under 250w in. Coldside 10-15º for an ambient in low 20's.
or perhaps even run them at 6v.
I believe these are fairly conservative figures.
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well i presume the 437 is a 360 so dont ask me
Originally Posted by flak-spammer What would the Qmax of 8 437w (w/e they actually are) TECs running at 6v? |
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I looked at the undervolting charts mentioned on here and it put them at 27w at 6v which on reflection is naff....the chart suggested by chielscape is pretty good at 6v and 5 amps you will get 25% qcmax which equals 77w but that is max...by the time you factor in inefficiencies you get down to about 50-55w...bit like Ira said.
The TEC's I suggested at 6v will give you a 50w Qc at 15-20ºC dT and they are half the price !!!
EdIT well $290 tops all in instead of $400+ plus shipping(you can check the stats on the ferrotec chart as I said use the 7v setting for 6v.)
If it were me I would prefer the 7v operating point 70-75w (total pump 560w for 225w power in.)
Run all 8 at 7v with one SE 320-15 (4 parallel pairs - total 14v 16amps.)
Originally Posted by flak-spammer Ah now those should be handy links. I already have Ultrasonics calculator I just wanted a slightly different perspective. |
The TEC's I suggested at 6v will give you a 50w Qc at 15-20ºC dT and they are half the price !!!
EdIT well $290 tops all in instead of $400+ plus shipping(you can check the stats on the ferrotec chart as I said use the 7v setting for 6v.)
If it were me I would prefer the 7v operating point 70-75w (total pump 560w for 225w power in.)
Run all 8 at 7v with one SE 320-15 (4 parallel pairs - total 14v 16amps.)
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