Properties and heat transfer coefficients of four molten-salt high temperature heat transfer fluid candidates for concentrating solar power plants

2017 International Conference on New Energy and Future Energy System

Liu, T.L.^1 ; Liu, W.R.^1 ; Xu, X.H.^1

School of Mechanical Engineering and Automation, Harbin Institute of Technology (Shenzhen), Guangdong Province Shenzhen

518055, China^1

关键词: Chloride salts;    Concentrating solar power;    Concentrating solar power plant;    Critical component;    High temperature heat transfer;    Molten salt mixtures;    Operating temperature;    Operating temperature ranges;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/93/1/012023/pdf
DOI  :  10.1088/1755-1315/93/1/012023

来源: IOP

【 摘 要 】

Heat transfer fluid is one critical component for transferring and storing heat energy in concentrating solar power systems. Molten-salt mixtures can be used as high temperature heat transfer fluids because of their thermophysical properties. This paper studied the thermophysical properties of Li2CO3-Na2CO3-K2CO3eutectic salt and three eutectic chloride salts NaCl-KCl-ZnCl2with different compositions in the range of 450-600°C and 250-800°C, respectively. Properties including specific heat capacity, thermal conductivity, density and viscosity were determined based on imperial correlations and compared at different operating temperatures. The heat transfer coefficients of using different eutectic salts as heat transfer fluids were also calculated and compared in their operating temperature range. It is concluded that all the four eutectic salts can satisfy the requirements of a high-temperature heat transfer fluid.