You will need a lot more copper tubing to make a difference with a fan. Even better if you can get a small radiator.
If you want to stick to a small amount of tubing consider a contact system such as a "cool shirt" which is nothing more than tubes that carry water attached to a t shirt. Since air isn't that great at heat transfer the contact based system takes that out. With the cool shirt you are basically cooling your whole core which allows the body to quicly get rid of excess heat.
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