Latent heat stores and phase change materials - an extensive area for thermal 
analysis, calorimetry and chemical thermodynamics

Kniep, R.; Laumen, M.; Zachos, A.

doi:10.1016/0040-6031(85)85547-7

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Latent heat stores and phase change materials - an extensive area for thermal analysis, calorimetry and chemical thermodynamics

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Kniep, R., Laumen, M., & Zachos, A. (1985). Latent heat stores and phase change materials - an extensive area for thermal analysis, calorimetry and chemical thermodynamics. Thermochimica Acta, 85(APR), 131-134. doi:10.1016/0040-6031(85)85547-7.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-B5C2-7

Abstract

Standard thermoanalytical techniques such as TG, DTA and DSC are used in search of suitable Phase Change Materials (PCMs) for high-capacity latent heat storage. We investigated eutectic mixtures of the ternary system NaOH-NaOH·H2O-KOH·H2O (ref.1) and found them excellent storage media in the low-temperature range 46–62°C with storage capacities between 482 and 526J/cm3. Reinvestigation of the proposed (ref.2) reversible reaction Ba(OH)2·8H2O + 2KNO3⇌2KOH + Ba(NO3)2 + 8H2O (65°C;ΔH=445J/cm3) revealed the system not to react in the sense of a double conversion; generally, reciprocal salt pairs seem to be less suited for thermal energy storage. The main problems of static latent heat stores are prevented by a new dynamic concept (ref.3): the system works with an auxiliary PCM (liquid⇌vapour) ensuring optimized conditions of heat transfer and homogenization of the storage material.