The authors have manufactured heating devices using PCMs (phase change materials) for housing heating, and conducted various experiments. One with a built-in heater for midnight power has employed a PCM whose fusing point was 28 degrees centigrade. The other was for a solar air collector. The two devices have shown that theoretical values were very close to those gained from experiments. It has been found from experiments that the capacity of the PCM heating device for midnight power was insufficient to be used from early morning. It has also been discovered from simulation that the PCM heating device for a solar air collector was useful in raising room temperatures both in the daytime and at night.
