What's New

CPU Cooler
VCool 2.0 
Waterfall Pro 
Current Tests 
Test Archives

UDMA Driver 
Windows 95
Windows 98
Windows NT

Way 2 Cool 
Compaq 1800T
1800T Temp Monitor
Going for 504
More on 504
Cheap Sandwich
BX6r2 Diode Fix
Lap that Slug
Celeron PPGA
Journey to 1080
Building an NT Box
Heat Pipe 1
Heat Pipe 2
Heat Pipe 2.2

Heat Sinks 
A&C Prototype Sink
Alpha P125
Alpha P521
CPU Cooler
Tom's Sink
Water Cooler 1
Water Cooler 2
Water Cooler 3
Water Cooler 4
Water Cooler 6
Water Cooler 7

Way 2 Cool
Thermometer 2
K-6 heat sink
Case Cooling
Heat Sink Tester
More Case Cooling
Klamath heat sink
Q500A Cooling
My Server Temps
Temp Calculators
CKS400 Rack Case
Fan Controller
Cooling Links
Downloads Page

Tips and Trix
Dual Boot Win95 / 98
Dual Boot Linux/NT4
D-B Linux/Win2k
Hot Flash your BIOS

Family Stuff
Prom / St. John

Email Jim

Attempt 2 
Taking a look at my results for the first attempt, I realized that a couple of things needed some attention.  First, I needed a larger and more efficient heat sink.  While the CPU Cooler heat sink worked well for keeping the Celeron cool before the adding the peltier, the additional heat generated by the TEC was too much for this unit (even with its dual fans).  I needed more mass and more surface area than this sink had to offer. The CPU Cooler sink weighs in at about 4 ounces and has a surface area of approximately 92 sq. inches.

Second, I needed some way to raise or regulate the low temperature achieved at idle.  Not only was I worried about frost and condensation, but I hoped to reduce the swing in temperature from almost freezing to the 90°F range is less than a couple minutes.  The accepted method for regulating temperature for peltiers is with a electronic circuit designed to vary the current to the TEC depending on temperature.  There are many circuit designs available for this and I may get around to building such a controller, but for now I was looking for a simpler method.  I was also looking for a way to increase the cooled mass so that when the processor was stressed, there would be a "reserve of cold" to draw from to lessen the temperature swings.  I settled on a mechanical means of accomplishing this. 

I began by using a pin-type heat sink made by Fullway that I had in my parts box.  This no-fan heat sink has a mass of about 5 ounces and a surface area of about 110 sq. in.  It performed pretty well in my heat sink tests considering it used no fan. During the tests, I thought it would been great with a couple of fans added to it.  I used the heat sink base as a template and traced and cut two pieces of 1/8" sheet aluminum, one to be used to increase the mass of the heat sink and one to be used for "cold storage" for the processor.  These aluminum plates were fairly flat and smooth to begin with, but I spent another couple of hours per plate lapping them with progressively finer grades of sandpaper until I ended up using 1000 grit paper for the final polishing.  Each one of these plates adds about one ounce and 25 sq. in. of surface area to the sink.  With all surfaces as flat and smooth as I could get them, I began assembly.

The peltier heat sink assembly was assembled by stacking the components as shown, sandwich style.  A thin layer of heat sink compound was used between each piece.  The exception was between the Celeron and the Aavid heat sink, which was insulated with duct tape so as not to short circuit the Celeron.

The whole assembly was held together with 4 -1½" 6-32 screws and nuts, with springs used so that equal force would be applied on the processor.


Adding the fans to this prototype was a mickey-mouse arrangement at best.  The lack of thickness of the heat sink's pins prevented drilling them to accept screws, and there wasn't enough room between the pins to add stand-offs.  My temporary solution works and the fans are not in any danger of falling off, but it looks like I don't know which end of a hammer to hit myself with.

It works better than expected =>

page 1
page 2
page 3
page 4
page 5
page 6
@ 504
page 7
page 8
page 9
page 10