Summer Peltier mini cooler for your back - V1

thingiverse

This thing is V1 of the peltier back mount mini cooler. It clips itself on any T-shirt at the back of your neck. The 9V battery is a Lithium-Ion battery (1000mAh), rechargeable by USB, and can last about 15 minutes. The peltier module is mounted so that the cold part is touching the back of your neck. I've covered the peltier module with aluminum tape to increase the cooling effect of the peltier. Inside the box, you will find two standard 40x40mm heatsinks for nema 17 (http://3dmodularsystems.com/fr/electronique/139-dissipateur-radiateur-moteur-pas-a-pas-nema-17.html). They are touching the hot side of the peltier module and are connected only using thermal paste. You won't need much more as everything is kept together with plastic parts. The fan is a 15,000 rpm 12V fan (http://3dmodularsystems.com/fr/ventilateurs/391-15000rpm-ventilateur-40mm-12v-dc-1416-cfm.html). I'm using the 15,000 rpm model because we are using it with a voltage between 5-8.5V, so the speed will be much slower than this but the airflow will still be enough to keep the hot side of the peltier cold. About the "9V" 1000mAh lithium USB rechargeable battery, the real voltage output is around 8.4V, so don't expect 9V out of these. We are using a 12V 6A peltier module powered by 8.4V or less. At this voltage, this module will need about 1.6A to run, so expect the system to run for maximum 15 minutes before the battery needs to be recharged. On one picture I've added a side 2.1x5.5mm connector (http://3dmodularsystems.com/fr/connectique/478-21x55mm-connecteur-d-alimentation-de-panneau-pour-prise-jack.html). This connector is connected directly to the Fan + peltier module. When you run out of battery, you can still use your system using a USB power bank providing 5V 2A output. You will need to make your own cable for that. In this case, the peltier module will use around 1A only but it will cool a little bit less than before. Using a simple power bank with 2200mAh (5V 2A output), the system is consuming around 1.1 - 1.3A. With this setup I could achieve an 85-minute autonomy when running continuously. The internal 1000mAh 8.4V battery will provide you with 15+ minutes of use. We've got a list of parts you'll need to assemble the peltier back mount mini cooler: * 1 x 9V battery * 1 x Rocker switch (10A) * 1 x 9V battery connector * 6 x M3x20mm thermoplastic screws (http://3dmodularsystems.com/en/nuts-bolts/158-m3x20mm-screw-white-zinc-steel-thermoplastic.html) * 1 x 15,000 rpm 12V 40mm fan (http://3dmodularsystems.com/fr/ventilateurs/391-15000rpm-ventilateur-40mm-12v-dc-1416-cfm.html) * 2 x 40x40mm heatsink for Nema 17 (http://3dmodularsystems.com/fr/electronique/139-dissipateur-radiateur-moteur-pas-a-pas-nema-17.html) * 1 x 2.1x5.5mm connector (http://3dmodularsystems.com/fr/connectique/478-21x55mm-connecteur-d-alimentation-de-panneau-pour-prise-jack.html) Special Note: Working great in areas with no wind during summer, such as non-air-conditioned trains. Updates: * 2019.08.02 - Original Post * V3 is available here: https://www.thingiverse.com/thing:3825516 Enjoy hot summer! 3D Modular Systems Evolutive 3D Printers You enjoy it and want to help us with a donation, consider Thingiverse "tipping" http://www.3dmodularsystems.com Twitter: https://twitter.com/3dmodularsystem Youtube: http://www.youtube.com/c/3DModularSystems3DPrinters