Summer Peltier mini cooler for your back - V3

thingiverse

# Purpose This thing is V2 of the peltier back mount mini cooler. It clips itself onto any T-shirt at the back of your neck. - The battery was removed from the box, as it doesn't bring a lot of autonomy for the oversize it brings. - A 12V 5.5x2.1mm connector on the side is used to power the whole system using a battery pack. - A special 2x18650 cells battery pack was made for this purpose here: https://www.thingiverse.com/thing:3815531 It can be attached to your belt using clips that you can screw onto it. - Two peltier modules are mounted so that the cold part touches the back of your neck. I've covered the peltier module with aluminium tape to increase the cooling effect of the peltier. Inside the box, you will find 1 slim 41x100x8mm heatsink The heatsink is 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 5015 5 Volt fan. As the power input is 5V 3A from the power bank, the best in this case is to use a 5V fan The blower type fan allows air flow to be pushed through a thin surface and then redirected directly to the heatsink fins. Depending on the quality of your peltier modules, you can expect to draw 2.4-2.5A from the 5V power supply. So make sure your power bank can handle at least 3A. As the peltier modules are designed for 15V 6A, lowering the voltage to around 5V lowers the current drawn to around 1A each. Each module can be switched ON or OFF depending on which area you prefer to cool down. Of course both modules can be powered ON as each peltier module has a dedicated 3A rated switch. The system can run between 2-4H non-stop using the 2x18650 battery (2x3400mAh cells). Note: On this setup, the blower fan is always ON even if the switches are both OFF. This makes sure the fan is ON no matter what. If the fan stops or is not powered on when the peltier modules are ON, this could result in overheating the heatsink, melting your plastic enclosure, damaging your peltier modules and burning yourself in the process. So make sure it's always running! About the power cable that goes from your USB power bank to your Jack Peltier cooling module, you can either buy one that is already made or make one yourself using 1 USB cable + 1x5.5x2.1 female connector from a broken 12V Power supply adaptor. # Wiring Check the provided wiring diagram picture for more details # Parts required * 2x 12V TEC1-12706 peltier module * 5V 3A power bank power supply (https://www.thingiverse.com/thing:3815531) * 2x Rocker switch (3A KDC11-101) * 1x 12V panel mount connector (http://3dmodularsystems.com/fr/connectique/478-21x55mm-connecteur-d-alimentation-de-panneau-pour-prise-jack.html) * 14x M3x10mm thermoplastic screws (http://3dmodularsystems.com/fr/visserie/244-vis-m3x10mm-pozi-zingue-blanc-thermoplastique.html) # Special Note: Working great in areas with no wind during summer such as non-air-conditioned trains.... # Updates * 2019.08.28 - Added version for single 12712 peltier module (40x40x3.2mm) * 2019.08.23 - Original Post (for peltier 12706 : 40x40x4mm) 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