Cooling Coasters with Fan

A Thermoelectric Cooling Coaster

Dimensions: Upper diameter 80mm, lower diameter 100mm, height 40mm

Function: Place a disposable cup of hot water on the coaster before drinking; the fan beneath will rotate, theoretically accelerating the cooling process

Principle: The coaster incorporates a thermoelectric cooling module. When a temperature difference exists between the module's surfaces, a small voltage is generated across its terminals, based on the Seebeck effect. This voltage powers a miniature hollow-cup motor.

Demonstration:

Required Components

No	Name and Model	Quantity	Image
1	Thermoelectric Cooler TEC1-12706 (40*40mm)	1
2	0.7mm Shaft Hollow Cup Motor 0412	1
3	60*45mm Thermoelectric Cooler Heatsink	1
4	M3x12mm Countersunk Screws	2
5	M3 Nuts	2
6	Adhesive Thermal Compound	1

Wiring Diagram

Assembly Instructions:

1. Secure the thermoelectric cooler to the heatsink using thermal compound.

2. Remove the central fin of the cooling module (I used a flathead screwdriver) to prevent motor contact.

Notes:

1. In a 12°C ambient temperature, with a disposable cup of freshly boiled water, the fan ran continuously for 20 minutes—sufficient time for the water to become drinkable.

2. Cups with flat bottoms ensure optimal contact with the thermoelectric cooler, maximizing fan operation.

3. While termed a cooling coaster, the cooling rate is comparable to simply resting a cup on a table. However, observing the thermoelectric generation powering the fan adds an intriguing element.

Model recommendation

Regular Polyhedron Generator