High Temperature Mass and Heat Transfer Fluid-Solid Coupling

2002 ◽  
Author(s):  
Bruno Dubroca ◽  
Georges Duffa ◽  
Bernard Leroy
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Transfer Fluid ◽  
Mass And Heat Transfer

Thermal and Transport Properties of NaCl–KCl–ZnCl2 Eutectic Salts for New Generation High-Temperature Heat-Transfer Fluids

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Peiwen Li ◽  
Edgar Molina ◽  
Kai Wang ◽  
Xiankun Xu ◽  
Ghazal Dehghani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Transport Properties ◽  
Thermal Power ◽  
Engineering Application ◽  
Heat Transfer Fluid ◽  
Heat Of Fusion ◽  
Temperature Heat ◽  
New Generation ◽  
Halide Salts

Three eutectic salts from a system of halide salts NaCl–KCl–ZnCl2 were chosen for detailed study of thermal and transport properties with the objective of developing a next generation high-temperature heat-transfer fluid (HTF) for concentrated solar thermal power (CSP) technology. The acceptable range of the working temperatures for the HTF is from below 250 °C to at least 800 °C. The tested properties are presented here for the three candidate eutectic salts, including melting point, heat of fusion, heat capacity, vapor pressure, viscosity, density, and thermal conductivity. Data-fitted equations are provided for all the measured properties for convenience in engineering application. It is concluded that the three eutectic salts can satisfy the needs for a high-temperature HTF and thus are recommended as a new generation high-temperature HTF.

scholarly journals Containment materials for liquid tin at 1350 °C as a heat transfer fluid for high temperature concentrated solar power

Solar Energy ◽  
2018 ◽  
Vol 164 ◽  
pp. 47-57 ◽  
Author(s):  
Yunshu Zhang ◽  
Ye Cai ◽  
SungHwan Hwang ◽  
Gregory Wilk ◽  
Freddy DeAngelis ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Solar Power ◽  
Heat Transfer Fluid ◽  
Concentrated Solar Power ◽  
Liquid Tin

Experimental Investigation to the Properties of Eutectic Salts by NaCl-KCl-ZnCl2 for Application as High Temperature Heat Transfer Fluids

2014 ◽  
Author(s):  
Kai Wang ◽  
Edgar Molina ◽  
Ghazal Dehghani ◽  
Ben Xu ◽  
Peiwen Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Melting Point ◽  
Vapor Pressure ◽  
Mole Fraction ◽  
Heat Transfer Fluid ◽  
Test Facility ◽  
Vapor Pressures ◽  
Heat Transfer Fluids ◽  
Temperature Heat

A group of eutectic ternary halide salts were surveyed and studied for the objective of developing a high temperature heat transfer fluid with a freezing point below 250°C and a low vapor pressure, below 1.0 atm, at temperatures up to 800°C. The studied salts include: 1) NaCl-KCl-ZnCl2 with a mole fractions of 18.6%-21.9%-59.5% and a melting point of tm=213°C; 2) NaCl-KCl-ZnCl2 with a mole fraction of 13.4%-33.7%-52.9% and a melting point of tm=204°C; and 3) NaCl-KCl-ZnCl2 with mole fraction of 13.8%-41.9%-44.3% and a melting point of tm=229 °C. Vapor pressures of these salts at different temperatures were experimentally obtained using an in-house developed test facility. The results show that vapor pressures of all the three eutectic molten salts are below 1.0 atm at a temperature of 800 °C. The salt of ZnCl2-KCl-NaCl in mole faction of 44.3%-41.9%-13.8% has lowest vapor pressure which is only about 1.0 atm even at a temperature of 900 °C. Viscosities of these salts were measured in the temperature range from after melting to 850°C. At low temperatures near their melting points of the salts, the viscosities are about 16 × 10−3Pa s, while at high temperatures above 700°C the viscosities are around 4 × 10−3Pa s, which is satisfactorily low to serve as heat transfer fluid for circulation in a CSP system. Both the vapor pressure and the viscosities of the studied three eutectic salts demonstrated satisfaction to serve as high temperature heat transfer fluids. Other thermal and transport properties of these salts are expected to be reported in the future for screening out a satisfactory high temperature heat transfer fluid.

High Temperature Thermochemical Energy Storage Using Packed Beds

2016 ◽  
Author(s):  
Qasim A. Ranjha ◽  
Nasser Vahedi ◽  
Alparslan Oztekin
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Energy Storage ◽  
Solar Energy ◽  
Latent Heat ◽  
High Temperatures ◽  
Heat Storage ◽  
Three Dimensional ◽  
Heat Transfer Fluid ◽  
Latent Heat Storage

Thermal energy storage units are vital for development of the efficient solar power generation systems due to fluctuating nature of daily and seasonal solar radiations. Two available efficient and practical options to store and release solar energy at high temperatures are latent heat storage and thermochemical storage. Latent heat storage can operate only at single phase change temperature. This problem can be avoided by some of the thermochemical storage systems in which solar energy can be stored and released over a range of high temperature by endothermic and exothermic reactions. One such reaction system is reversible reaction involving dehydration of Ca(OH)2 and hydration of CaO. This system is considered in the present study to model a circular fixed bed reactor for storage and release of heat at high temperatures. Air is used as heat transfer fluid (HTF) flowing in an annular shell outside the bed for charging and discharging the bed. The bed is filled with CaO/Ca(OH)2 powders with particles diameter of the order 5μm. Three dimensional transient model has been developed and simulations are performed using finite elements based COMSOL Multiphysics. Conservation of mass and energy equations, coupled with reaction kinetics equations, are solved in the three dimensional porous bed and the heat transfer fluid channel. Parametric study is performed by varying HTF parameters, bed dimensions and process conditions. The results are verified through a qualitative comparison with experimental and simulation results in the literature for similar geometric configurations.

Corrosion of Nickel-Based Alloys in Ultra-High Temperature Heat Transfer Fluid

2017 ◽  
Vol 36 (3) ◽  
pp. 267-277 ◽  
Author(s):  
Tao Wang ◽  
Ramana G. Reddy
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Corrosion Rate ◽  
Energy Dispersive Spectrometer ◽  
Heat Transfer Fluid ◽  
Excellent Thermal Stability ◽  
Rate Analysis ◽  
Operation Temperature ◽  
Corrosion Mechanisms ◽  
Molten Salt System

AbstractMgCl2-KCl binary system has been proposed to be used as high temperature reactor coolant. Due to its relatively low melting point, good heat capacity and excellent thermal stability, this system can also be used in high operation temperature concentrating solar power generation system as heat transfer fluid (HTF). The corrosion behaviors of nickel based alloys in MgCl2-KCl molten salt system at 1,000 °C were determined based on long-term isothermal dipping test. After 500 h exposure tests under strictly maintained high purity argon gas atmosphere, the weight loss and corrosion rate analysis were conducted. Among all the tested samples, Ni-201 demonstrated the lowest corrosion rate due to the excellent resistance of Ni to high temperature element dissolution. Detailed surface topography and corrosion mechanisms were also determined by using scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS).

High-temperature corrosion of Sn–Bi–Zn–Ga alloys as heat transfer fluid

Rare Metals ◽  
2020 ◽  
Author(s):  
Qing-Meng Wang ◽  
Xiao-Min Cheng ◽  
Yuan-Yuan Li ◽  
Guo-Ming Yu ◽  
Zhi Liu
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
High Temperature Corrosion ◽  
Heat Transfer Fluid
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