Multi-stage variable type waste heat storage and recovery apparatus and method thereof

A waste heat storage and recovery apparatus comprising:

• a phase change material storage unit for separating and arranging a plurality of phase change materials having different melting points, and arranging them in stages on a path of the waste heat so that a phase change material having a higher melting point is located closer to an inlet side of the waste heat;
• a use place registration unit for registering a plurality of heat energy use places;
• a temperature range storage unit for storing a required temperature range of each of the heat energy use places registered in the use place registration unit;
• a phase change material selection unit for selecting a phase change material of a corresponding melting point among a plurality of phase change materials stored in the phase change material storage unit according to the temperature range of each of the heat energy use places stored in the temperature range storage unit;
• and
• a heat energy supply unit for supplying heat energy by a latent heat of the phase change material selected by the phase change material selection unit to a corresponding heat energy use place among a plurality of heat energy use places, and
• wherein the use place registration unit registers at least one of a heater and an air conditioner corresponding to a place,
• wherein the temperature range storage unit stores temperature range required by the heater or the air conditioner, and
• wherein the heat energy supply unit supplies heat energy by the latent heat of the selected phase change material to a corresponding to the heater or the air conditioner.