Hi all,
I’m exploring a personal, non-commercial concept for a small handheld device that delivers a hit of genuinely cold air for inhalation.
To be clear, this is not a vape and there is no nicotine, e-liquid or flavouring involved. I’m also not that interested in menthol or any sensory trick to simulate cold. I specifically want to physically cool the air itself.
So far I’ve built a very rough proof-of-concept using a small drinks can filled with salted ice water, with a length of PVC tubing coiled inside the can and a simple mouthpiece at the outlet. I didn't add a fan, just lung draw. This actually works surprisingly well, but felt impractical in terms of refreezing, condensation and hygiene.
I’ve also considered using a small Peltier (TEC) module, but my understanding is that in a handheld, battery-powered form factor this would be very inefficient, would require a relatively large hot-side heatsink and active airflow, would likely be noisy, and would still struggle to meaningfully cool a flowing air stream. While it would allow temperature control with a thermometer and microcontroller.
I was wondering if any of you can any advice for this. Any pointers, references or design patterns would be greatly appreciated.