System for energy consumption reduction and cost savings in a building

A method for making a building or structure engineered to have reduced energy consumption,

• the method comprising constructing, installing or engineering in the building or structure a system, wherein the system comprises:
• a room or a building space having a ceiling, or having at least one wall;
• at least one plenum space above the ceiling or behind the at least one wall, wherein at least one opening connects the at least one plenum space with the room or building space;
• and
• a first Phase Change Material (PCM) assembly, rack, tray or mat comprising a plurality of encapsulated, microencapsulated or packaged PCM, or a plurality of pouches comprising or having contained therein the plurality of encapsulated, microencapsulated or packaged PCM,
• wherein an outer face of the first PCM assembly, rack, tray or mat is open and exposes the plurality of encapsulated, microencapsulated or packaged PCM, or the plurality of pouches to the plenum space and surrounding air to improve convective heat transfer between the plurality of encapsulated, microencapsulated or packaged PCM, or the plurality of pouches, and the plenum space and surrounding air;
• and
• at least one additional PCM assembly, rack, tray or mat comprising a plurality of encapsulated, microencapsulated or packaged PCM, or a plurality of pouches comprising or having contained therein the PCM, and the outermost at least one additional PCM assembly, rack, tray or mat has an outer face,
• wherein the plurality of encapsulated, microencapsulated or packaged PCM, or the plurality of pouches, of the at least one additional PCM assembly, rack, tray or mat are exposed to the plenum space and surrounding air to improve convective heat transfer between the plurality of encapsulated, microencapsulated or packaged PCM, or the plurality of pouches, and the surrounding air in the plenum space;
• wherein the first PCM assembly, rack, tray or mat is disposed or positioned in the at least one opening between the plenum space and the room or building space, or the first PCM assembly, rack, tray or mat is positioned to cover an opening between the plenum space or opening and the room or building space, or the first PCM assembly, rack, tray or mat is positioned in the plenum space, and
• the at least one additional PCM assembly, rack, tray or mat is positioned above or in back of the first PCM assembly, rack, tray or mat within the plenum space or the at least one opening, and there is a space between the at least one additional PCM assembly, rack, tray or mat and the first PCM assembly, rack, tray or mat.