DIY Passive cooling with PIN Heatsinks SST120 and SST140

robincnn

robincnn

Well-Known Member
140 and the new Prototype heatsink that replaces the 140. Both are almost the same weight.
I moved all the pins on my own in this Prototype. The production heatsinks will have pins spaced more evenly with machine and will be available soon. Should have 100+ samples in 1-2 weeks. and a lot more in 4 weeks.
Beats the 140mm.
I tested against Giga 100mm height (1.5Kg) but the new heatsink(0.8Kg) lost. Can't complain it is almost half the weight.
Will share data in few weeks.

upload_2016-10-20_11-56-59.png

Spreading the pins allows the air to move easily through the heastink. More cooling for same weight. and these look cute like sea urchin too

Splayed pin-fin heatsinks consist of a base and an array of embedded round pins splayed outwards (Fig. 1). Forged from aluminum or copper, they range in size from 0.27 by 0.27 in. to 2 by 2 in. and in heights from 0.3 to 1.1 in. Splayed pin fins are derivatives of traditional pin-fin heatsinks that contain an array of vertical round pins
Click to expand...
2 inches is 50mm. It is easy to do with low pin density small heastinks but is a time consuming process with bigger heatsinks with lots of pins.
The one i am working on in 120+mm. It takes several passes/iterations to spread out the pins on such a large heastink.
The Chinese factory took months to perfect the process and setup splay molds but it is still time consuming.

Compared to traditional pin fins, splayed pin fins generate superior cooling power in limited-airspeed environments as well as lower pressure drop in any given airspeed environment. In limited-airspeed environments, splayed pin fins offer up to a 20% cooling premium over traditional pin fins and significantly larger cooling premiums over most other existing heatsink technologies.
Click to expand...
The performance premiums offered by splayed pin fins come from the unique splay structure that produces larger distances between the pins while preserving large surface areas. The larger spacing enables airstreams to enter and exit the pin array more efficiently.
From a cooling perspective, the large surface area of the heatsink is exposed to a large air volume and therefore able to provide more effective cooling. From a pressure-drop perspective, the wider spacing enables more air to exit the pin array, reducing pressure drop.
Click to expand...
Source: http://electronicdesign.com/components/more-efficient-cooling-try-splayed-pin-fin-heatsinks

These are relatively new derivatives of the standard pin fin heat sink. Unlike standard pin fin heat sinks, which contain an array of vertically oriented pins, splayed pin fins features pins that gradually bend outward. Curving the pins in this way increases the spacing between the pins and allows surrounding airstreams to enter and exit the pin array more efficiently without sacrificing surface area.
Click to expand...
http://www.newelectronics.co.uk/electronics-technology/pin-fin-heat-sinks-point-the-way-to-more-efficient-cooling/18641/
 
Last edited:
nogod_

nogod_

Well-Known Member
How adaptable is the "splay machine" to other sizes?

Interested in splay-pin fins for 25w to replace your sst105's.

Thought I was ready to order from you then you dangle the deluxe ish....

robincnn said:
140 and the new Prototype heatsink that replaces the 140. Both are almost the same weight.
I moved all the pins on my own in this Prototype. The production heatsinks will have pins spaced more evenly with machine and will be available soon. Should have 100+ samples in 1-2 weeks. and a lot more in 4 weeks.
Beats the 140mm.
I tested against Giga 100mm height (1.5Kg) but the new heatsink(0.8Kg) lost. Can't complain it is almost half the weight.
Will share data in few weeks.

View attachment 3809683

Spreading the pins allows the air to move easily through the heastink. More cooling for same weight. and these look cute like sea urchin too


2 inches is 50mm. It is easy to do with low pin density small heastinks but is a time consuming process with bigger heatsinks with lots of pins.
The one i am working on in 120+mm. It takes several passes/iterations to spread out the pins on such a large heastink.
The Chinese factory took months to perfect the process and setup splay molds but it is still time consuming.





Source: http://electronicdesign.com/components/more-efficient-cooling-try-splayed-pin-fin-heatsinks


http://www.newelectronics.co.uk/electronics-technology/pin-fin-heat-sinks-point-the-way-to-more-efficient-cooling/18641/
Click to expand...
 
robincnn

robincnn

Well-Known Member
nogod_ said:
How adaptable is the "splay machine" to other sizes?
Click to expand...
Good question will look into it. I doubt it will work with round heastinks.

nogod_ said:
Interested in splay-pin fins for 25w to replace your sst105's.
Click to expand...
Splaying adds cost. The whole point of 105 was to have a lowest cost heatsink for underdriving cobs.
Then have to spend money to setup new mold for the plastic packing. SST105 not as popular.
I plan to just sell 120mm's and the new splay designs as main products
Got plenty of stock for 105's pre drilled for Vero 29/3590

nogod_ said:
Thought I was ready to order from you then you dangle the deluxe ish....
Click to expand...
There will be always something new. Got you keep DIY'ers busy o_O
 
You must log in or register to reply here.
Top