Phase-changing materials

A manufacturing technology to produce very small encapsulated phase-change materials has been developed (47). These encapsulated phase-change materials were appHed in a convective heat-transfer test section, and a 50—100% higher heat-transfer coefficient was reported. 

Fig. 17. Heat-transfer coefficient comparisons for the same volumetric flow rates for (A) water, 6.29 kW, and a phase-change-material slurry (O), 10% mixture, 12.30 kW and ( ), 10% mixture, 6.21 kW. The Reynolds number was 13,225 to 17,493 for the case of water.

HEAT STORAGE BY PHASE CHANGING MATERIALS AND THERMOECONOMICS... 

Adebiyi, G. A., 1991, A second law study on packed-bed energy storage systems utilizing phase change materials, ASME J. Solar Energy Eng. 113 146—156. 

Go, Z., Liu, H., and Li, Y., 2004, Thermal energy recovery of air conditioning system—heat recovery system calculation and phase change materials development, Applied Thermal Eng. 24 2511—2526... 

Setterwall, R, 2002. Advanced Thermal Energy Storage through Applications of Phase Change Materials and Chemical Reactions Feasibility Studies and Demonstration Projects, International Energy Agency (IEA), Annex 17. 

PHASE CHANGE MATERIALS AND THEIR BASIC PROPERTIES... 

Abstract. This section is an introduction into materials that can be used as Phase Change Materials (PCM) for heat and cold storage and their basic properties. At the beginning, the basic thermodynamics of the use of PCM and general physical and technical requirements on perspective materials are presented. Following that, the most important classes of materials that have been investigated and typical examples of materials to be used as PCM are discussed. These materials usually do not fulfill all requirements. Therefore, solution strategies and ways to improve certain material properties have been developed. The section closes with an up to date market review of commercial PCM, PCM composites and encapsulation methods. 

Physical, Technical and Economical Requirements on Phase Change Materials... 

Zalba B., J.M. Mann, L.F. Cabeza, and H. Mehling, 2003. Review on thermal energy storage with phase change Materials, heat transfer analysis and apphcations, Appl. Thermal Eng., 23, 251-283. 

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