Abstract
This article presents a detailed study on the various stages involved in development of an industrial-scale latent heat storage (LHS) system. Preliminary studies are conducted in a lab-scale LHS prototype of 10 MJ storage capacity. The storage unit is a shell-and-tube type heat exchanger with embedded finned tubes. A ternary salt mixture comprising of potassium nitrate, sodium nitrate and sodium nitrite in the weight proportion of 53:7:40 is used as the phase change material (PCM) in the lab-scale LHS prototype. Hi-Tech Therm 60 is used as the heat transfer fluid (HTF). Performance parameters viz., melt fraction, charging/discharging time and energy storage/discharge rate were evaluated at different operating conditions. With the expertise and knowledge gained from the experimental and numerical investigations, the studies has been extended to develop an industrial-scale LHS system of 0.25 GJ capacity. A binary salt mixture comprising of sodium and potassium nitrate in the weight proportion of 60:40 is used as the PCM in the industrial-scale LHS module. The developed LHS module is then integrated with a commercial steam accumulator storage system of 1 GJ storage capacity. This combined storage system has been installed in the LFR based pilot-CSP plant in Vallipuram, Tamil Nadu, India.
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