▎ 摘　　要

NOVELTY - Multi-layer polymer encapsulated phase change material (PCM) bead system comprises a core and coating layers, where the core comprises PCM including a mixture of saturated fatty acids and/or waxes encapsulated by a first coating layer of polymer membrane with thermally conductive nano-additives forming a thermally conductive coating over the PCM core, a second water resisting polymeric coating layer and a third outermost coating layer comprising cement, fly ash, ground granulated blast furnace slag (GGBS) and other Pozzolanic material, the melting temperature of the bead core is 34-38°C and the core is made of first biopolymer, water-resistant polymer and outer layer in a weight ratio of 25-40:2-4:60-75. USE - Multi-layer polymer encapsulated phase change material bead system for use in buildings/structures/construction industry. ADVANTAGE - The multi-layer polymer encapsulated phase change material bead system improves the energy efficiency of new and existing buildings, reduces the amount of electricity required for cooling or heating of buildings to maintain thermal comfort for the occupants, is integrated directly into building envelops as a part of building construction material and is practically maintenance free and easy to repair during its service period. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a process preparing the multilayer polymer encapsulated PCM bead, which involves: a. preparing the core of PCM beads by preparing 4% biopolymer precursor sodium alginate aqueous solution and mixing with 300-350 ml PCM; b. adding the solution dropwise to aqueous solution of 7-10% calcium chloride dehydrate or calcium chloride hexahydrate using encapsulator or microencapsulator to obtain PCM core with calcium alginate and drying the beads in ambient temperature for 2-3 days; c. adding 0.05-0.4% sonicated thermally conductive material and the obtained beads to 4% sodium alginate solution and drying the beads in ambient temperature for 2-3 days to obtain PCM beads with thermally conductive biopolymer layer; d. dissolving water-resistant polymer in water organic solvent with 0.05-0.4% sonicated thermally conductive material and coating the beads to obtain a second moisture resistant coating of the beads; e. coating the beads with a third coating material comprising cement or fly ash and repeating the water-resistant polymer and cement fly ash powder coating process 2-3 times to yield a multilayer polymer encapsulated PCM beads; and f. drying the beads in ambient conditions for 48-72 hours to yield dried PCM beads.