Interesting Helmet
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Demo_Nic
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Quo Vadimus
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Rusty J
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If you have the power to spare...
The way to go is with a solid-state Peltier Effect device, tied into a liquid-cooling loop.
The common use for them is in portable electric ice chests/warmers. Given an efficient heat sink, they're capable of producing a 67ºF temperature drop/rise relative to ambient temperature.
They are rather inefficient, but useful where simplicity is the priority.
Start with a helmet two sizes too large, make a inner liner of parallel neoprene tubing (I'd suggest the surgical tubing used for model airplane fuel line), connect the tubing to a coolant heat-exchanger on the cold-side of the Peltier device, and heat-sink the living daylights out of its hot side. Mount the heat exchanger/Peltier device/heat sink assembly on the side of the helmet, add a small electric pump to circulate the water, and plug it into the bike for power.
Probably won't be terribly quiet what with the pump noise and turbulence around the fins of the heat sink while in motion, but ought to work. Move the cooler and pump to the bike and make the water lines dis-connectable to reduce the noise level. I'd considered using something like this with a Veskimo cooling vest, but it could work with a helmet as well. If not mounted to the helmet, you could use a water-cooled heat-sink arrangement on the hot side (including a fan and radiator) for increased efficiency and effectiveness.
The common use for them is in portable electric ice chests/warmers. Given an efficient heat sink, they're capable of producing a 67ºF temperature drop/rise relative to ambient temperature.
They are rather inefficient, but useful where simplicity is the priority.
Start with a helmet two sizes too large, make a inner liner of parallel neoprene tubing (I'd suggest the surgical tubing used for model airplane fuel line), connect the tubing to a coolant heat-exchanger on the cold-side of the Peltier device, and heat-sink the living daylights out of its hot side. Mount the heat exchanger/Peltier device/heat sink assembly on the side of the helmet, add a small electric pump to circulate the water, and plug it into the bike for power.
Probably won't be terribly quiet what with the pump noise and turbulence around the fins of the heat sink while in motion, but ought to work. Move the cooler and pump to the bike and make the water lines dis-connectable to reduce the noise level. I'd considered using something like this with a Veskimo cooling vest, but it could work with a helmet as well. If not mounted to the helmet, you could use a water-cooled heat-sink arrangement on the hot side (including a fan and radiator) for increased efficiency and effectiveness.