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Old 1st October 2003, 07:43 PM   #1
adirax is offline adirax  Romania
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Default Fan cooler for JLH 10W a-class

Fan cooler for JLH 10W a-class

Please, Can anybody help me?
I bought for my JLH amp (under construction) 4 coolers Cooler Master TP2-5020B2. It's a pentium 2 cooler, Rth=0.56C/w if fan turns at 4700 rpm.
I intend to use them at half speed in order to reduce the fan noise (32 dB at 4700 rpm).

Now my problem is: how can I calculate the new Rth when speed is only 2300 rpm?
I mean must I think to add passive heatsinks? (The dissipated power on each MJ15003 will be 40W.)

many thanks,
AR
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Old 14th May 2004, 05:18 PM   #2
Alex P is offline Alex P  Romania
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pentru 40W iti recomand un radiator de PC cat mai mare si ventilatoare >8cm la ~1800 rpm.
isi fac treaba excelent si sunt silentioase.
Ventilatoarele tale fac zgomot nu gluma
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Old 15th May 2004, 01:02 AM   #3
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I have had good results getting rid off 70Watt from a single pentium II cooler at just a fraktion of it's normal rpm.. My feeling is that you can get away with it....

Goodluck,
Thijs
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Old 15th May 2004, 10:21 AM   #4
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Maybe you can find a graph showing the Rth vs wind speed somewhere on the manufacturer's site?
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