Passive LED cooling

The obvious advantages of passive cooling in LED application are simplicity, cheapness and the lack of additional waste of energy for heat transfer away from LED fixture. Valuable feature also is the noiseless process of cooling,  unlike active cooling for example. read more …

We will provide some examples such design here. On practice, from many experiments and prototyping we know for sure that more successful thermal design with passive LED cooling  can provide  satisfactory efficiency (T*s = 60-80*C) in thermal management for LED fixtures with input electrical power  up to (15-20)W. Of course, you can increase input power without improving passive cooling system but increasing temperature (T*s) will affect the light output up to risk of catastrophic failure of LEDs itself. Any way   more powerful LED fixture will need active cooling system which is able to increase value h significantly by forcing air (or water) through fixture construction and dissipate heat effectively. Here are some examples of passive LED cooling design.

Example 1, Example 2Example 3Example 4, Example 5

Some of them could be very extraordinary …

Spiral- toroidal shape of heat sink has good cooling efficiency.

We can discuss why …

Example 6,  Example 7,  Example 8

News in the Passive LED cooling

2014/05/31

Here is example of good understanding of meaning of temperature gradient in the conductive component of heat transfer in the cooling of LED fixture.  Fortunately 3.9 *C/W is not limit for 13 W input electrical power at right convection component.

http://www.led-professional.com/products/led-thermal-management/new-product-and-advizes-from-mechatronix-to-improve-performance-of-passive-free-air-convection-heat-sinks-by-up-to-25

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