Advancements and challenges in enhancing salt hydrate phase change materials for building energy storage: Optimization methodologies and mechanisms

Special Topic: Energy Systems of Low Carbon Buildings

Open Access

Review

Table 7

Overview of microencapsulation technologies for various salt hydrate PCMs ^a

Type of PCMs	Encapsulation technique	Latent heat capacity (J/g)		Note	Reference
Type of PCMs	Encapsulation technique	Before cycling	After cycling	Note	Reference
Na₂SO₄·10H₂O	Interfacial polymerization in nanoparticle-stabilized inverse emulsions (91.5% encapsulation capacity)	~60	~60 (20 cycles)	−50 to 90°C	[86]
Na₂SO₄·10H₂O	Emulsion polymerization (59.3% encapsulation capacity)	125.6	100.9 (100 cycles)	−50 to 50°C	[88]
Na₂HPO₄·12H₂O	Interfacial polymerization combined with sol-gel process (75.3% encapsulation capacity)	177.0	176.2 (30 cycles)	−30 to 55°C	[87]
Na₂SO₄·10H₂O	Water-in-oil (W/O) emulsions (47.07% encapsulation capacity)	90.74	78.47 (100 cycles)	5 to 45°C	[89]
Na₂S₂O₃·5H₂O	Sol-gel method (71.09% encapsulation capacity)	149.82	123.99 (200 cycles)	Unclarified	[90]

a: Encapsulation capacity denotes the ratio between the latent heat of raw salt hydrate PCMs and the latent heat of microencapsulation PCMs.

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