Why Personal Cooling?
The ability to cool large environments where people could cool off has been around for thousands of years, most notably by the Romans. The need for cooling just an individual when they are in a hot environment developed in the last century when humans went into space. Only then did the need, science, and technology come together to provide personal cooling of one individual at a time.
Personal Cooling Systems
Based on NASA research for astronauts on spacewalks, personal cooling systems have developed for dozens of applications, but they all focus on cooling a person's core body. From surgeons working in a hot OR, to racecar drivers steering a fireplace on wheels, and to firefighters and welders working in volcano like environments, many reasons went into developing personal cooling systems. All of these systems focus on cooling a person's core body.
Cooling a Person's Core Body
To cool a person's core body, ice-cold water is circulated over the chest and back through tubing sewn on a shirt. The shirt is connected to a cooler (most often with a hose) and the cooler has a pump that circulates water that has been cooled by ice in the cooler.