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Thermal energy storage is usually associated with ice. This article describes chiller retrofit project at a semiconductor manufacturing plant that uses artificial phase-change material (PCM).

The authors say the advantages of PCMs are lower melting points, faster energy transfer and negative expansion. This project is the first use of PCM combined with free cooling, VFD chiller and predictive algorithm control.

Citation: ASHRAE Journal, vol. 49, no. 7, July 2007