A study on heat transfer characteristics of quinary molten salt mixture. (December 2018)

• Record Type: Journal Article
• Authors: Kim, Haneol; Kim, Hongsoo; Lee, Sangnam; Kim, Jongkyu
• Is Part Of: International journal of heat and mass transfer. Volume 127(2018)Part C
• Page Start: 465
• Page End: 472
• Publication Date: 2018-12
• Subjects: Solar thermal -- Molten salt -- Heat transfer -- Correlations -- Steam generator; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2018.08.029
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Experimental analysis of quinary molten salt mixture heat transfer characteristics. New convective heat transfer correlation suitable for molten salts was derived. Correlation accuracy was verified through comparison with Dittus & Boelter and Wu correlations. A concentric heat exchanger was used for steam production to use quinary molten salt. Abstract: In this study, experimental analysis of the heat transfer characteristics of a quinary molten salt mixture was carried out. This mixture was developed at Korea Institute of Energy Research as a heat storage material for a solar thermal power plant. Experiments were conducted to obtain the heat transfer coefficient in a vertical tube and to generate steam in a heat exchanger. To obtain the heat transfer coefficient, the temperatures of the outer wall, inlet, and outlet were measured in upward molten salt flow. Heat transfer correlations were proposed for the molten salt based on experimental data. The accuracies of the correlations were 60% and 88% for the transition and turbulent flow regions, respectively, with an error range of ±20%. A concentric heat exchanger was used for steam production to use the molten salt for power generation. Superheated steam at 100 bar and 400 °C was generated through heat transfer between the high temperature molten salt and water, with an efficiency of 81–91%.