We are working on a wearable headband device which gives cold therapy to specific locations on head using Thermoelectric Peltier element. We currently have a very reliable control circuitry for the level of cold when we use large heatsink at hot side of the Peltier. Since it will be a wearable device, it should be portable, lightweight and not too big in size. So, heatsink for the hot side should be as small as possible- if possible without fan.

Any suggestion is appreciated. Thanks

We are working on a wearable headband device which gives cold therapy to specific locations on head using Thermoelectric Peltier element. We currently have a very reliable control circuitry for the level of cold when we use large heatsink at hot side of the Peltier. Since it will be a wearable device, it should be portable, lightweight and not too big in size. So, heatsink for the hot side should be as small as possible- if possible without fan.

How do I make a good heat sink without a fan?