Inside a medical room, at a temperature of 77°C, you have equipment for the treatment of inflammation in the kneecap. The equipment consists of two concentric emitter and receiver disks (grey bodies) with a diameter of 10cm. The disks are separated by a distance of 5cm.
The power of the emitter is 300W. The surfaces not seen between both disks are isolated.
To determine the temperature of the emitter, we need to know the emissivity of the emitter, which is given as 0.8.
We also need to determine the temperature of the receiver, the transmission of net radiative heat to the surroundings per unit time, and the net radiative heat transfer per unit time between the emitter and receiver.