Example
If you eat 2,000 calories per day, that is equivalent to about 100 joules per second or about 100 Watts - which must be emitted.
Let’s see how much radiation you emit when the temperature is comfortable, say 75oF=24oC=297K, and pick a surface area, say 1.5m2, that is at a temperature of 93oF=34oC=307K: Pemitted = ??AT4 =
(5.67x10-8W/m2K4)*(.97)*(1.5m2)*(307K)4 = 733 Watts emitted!