Riding motorcycles in winter is painful, especially to delivery men and women who drive for many hours a day. Many of them said in an interview that driving bikes in winter is too cold that they're glad to see red lights since it's the only time to get their bodies warmer. Some of the bike riders get their hands and feet closer to the engine and warm their bodies up using engine heat.

B-Heat is a hot air fan for motorcycles that recycles exhausted engine heat. While riding, it self-generates and reserves electricity using headwind. Then, while stopped to wait for a signal, it sucks and conveys heat up to the driver. 

Double-wall structure and soundproofing material inside for insulating heat and wind noise

Bakelite plastic used for enduring high temperature of the engine

A small battery of 3.7V 100mAh is installed only for 30 seconds while waiting for traffic signals

The wind passed via engine is purified going through the filter, removing oil smell and fine dust

When a motor rotates faster than its rated rotation speed, electricity is generated. Assuming driving at 60km/h, 17m/s of strong headwind turns the motor more quickly than rated rotation speed to create and save battery power. When bike stops and no more overcurrent/overvoltage occurs, the motor starts to rotate around lower speed and suck heat from engine to rider's body.

Normally, perpendicular to the direction of progress means a negative state (off, locked), and conversely, the parallel direction means a positive condition (on, unlocked). Examples are stop signs, shipping container locks, gas pipe valves, and door lock systems. Applying this signifier to the B-Heat, the rotary switch is designed to provide intuitive control. Drivers don't have to think about controlling fan speed during their cautious driving.

An underbone is one of the motorcycles styles that uses structural tube framing with an overlay of plastic body panels. They are most popular in the southeast and middle Asia for daily and business purposes. The underbone has an engine under the main body, and there are holes for maintaining it on the front faring. Using these holes, B-Heat fits on almost every underbone bike. High-resilience band and clipping frame structures make it easy to be installed, disassembled, and stored when unused.

A prototype was made of acrylic pipe, 45° PVC elbow, and lathe-processed mono cast nylon. Motors and batteries were installed inside. Transistors and reed switches were used to implement rotate-to-switch fan speed. Steel stick was welded for hooking/clipping frames, and high-resilience band and Velcro were sewed for tightening.

In the prototype test, air temperature rose by 81.8% compared to the outside while passing B-Heat. (increased by 6.5°C while getting through B-Heat, when the outside temperature was 16.5°C)