We are developing a pan for PhotonGrill that uses phase-change-material (PCM) for storing heat. When cloud coverage lasts for too long, the temperature in the pan starts to decrease, when this happens the phase change material will release heat to maintain the temperature.
How it works: When the PCM reaches a certain temperature it changes its state of matter from solid to fluid. The transmission requires energy that is “stored” as long as the material is fluid. When the temperature of the surrounding area falls below a certain threshold, the material will attempt to become solid again and thereby releases heat.