An evaluation of microencapsulated PCM for use in cold energy transportation medium

Conference · Tue Dec 31 00:00:00 EST 1996

OSTI ID:435610

Yamagishi, Yasushi; Sugeno, Tomohisa; Ishige, Takashi ^[1]; Takeuchi, Hiromi; Pyatenko, A T ^[2]

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1. Daido Hoxan Inc., Chitose (Japan). Chitose Lab.
2. Hokkaido National Industrial Research Inst., Sapporo (Japan)

For cold energy applications, the feasibility of microencapsulated phase change material (PCM) and their slurry have been investigated experimentally; thermal properties, rheological properties and the structural integrity of PCM microcapsules (MCs) have been evaluated. The paraffins of two types, n-Tetradecane and n-Dodecane (melting point 5.5, {minus}13.5 C), were microencapsulated as PCMs. MCs samples of four different size-distributions ranging from 5 {micro}m to 1,000 {micro}m were prepared for this work. The supercooling of microencapsulated PCM induced by the smallness of MCs was detected through differential scanning calorimetry (DSC) and the heating/cooling temperature variations of slurry. Structural stability of the MCs had a dependence on their diameters. Smaller size MCs withstood the stress from the slurry flow and the volumetric expansion of phase change. Slurry which contained a high concentration of small size MCs had high apparent viscosity. Ionic surfactants were effective additives to reduce viscosity. The large reduction of slurry friction due to the turbulent drag reduction was observed during pressure drop measurements.

• OSTI ID: 435610
• Report Number(s): CONF-960805-; TRN: IM9710%%268
• Resource Relation: Conference: 31. intersociety energy conversion engineering conference, Washington, DC (United States), 9-14 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 31. intersociety energy conversion engineering conference. Volume 3: Policy impacts on energy, renewable energy resources, energy systems, environmental impact; Chetty, P.R.K.; Jackson, W.D.; Dicks, E.B. [eds.]; PB: 684 p.
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
PHASE CHANGE MATERIALS
COLD STORAGE
HEAT TRANSFER FLUIDS
ENCAPSULATION
THERMODYNAMIC PROPERTIES
RHEOLOGY
MECHANICAL PROPERTIES
DODECANE
ALKANES
PARTICLE SIZE
THERMAL CYCLING