Combined wall-to-fluidized bed heat transfer. Bubbles and emulsion contributions at high temperature

Dense suspension of solid particles as a new heat transfer fluid for concentrated solar thermal plants: On-sun proof of concept

“…The mean heat transfer coefficient obtained at low temperature (about 250 1C) being about 400 W/m 2 K, a higher heat transfer coefficient can be expected at 700 1C and more so because Flamant and Ménigault (1987) have shown previously a large increase of wall-to-fluidized bed heat transfer coefficients with temperature. At this moment, only general trends can be drawn to compare DSP and molten salts that is the more developed HTF technique in central receiver solar power plants.…”

On-sun demonstration of a 750 °C heat transfer fluid for concentrating solar systems: Dense particle suspension in tube

“…For the same solid circulation and solar irradiation, the heat transfer coefficient increases by almost 30% when the temperature increases from 220°C to 580°C. As underlined by Flamant and Ménigault (1987) and Pitié et al (2013) the combination of two factors can explain this. First, the radiation heat contribution, which is negligible at low temperature when the wall maximum temperature is around 450°C, becomes important at high temperature when the wall front temperature goes over 800°C.…”

Monte Carlo advances and concentrated solar applications

“…Fluidized beds are commonly used as thermal exchangers for high temperature processes. A gap toward the improvement of thermodynamic cycles for solar electricity production will be the finding of a technological solution for direct gas heating within solar receivers (with the objective of reaching temperature levels higher than 1000 K at the turbine entrance) and the use of solid fluidized particles directly submitted to the concentrated solar flux is an extensively explored foreseen solution (Flamant and Menigault, 1986;Haddad and Elsayed, 1988;Muller et al, 2003;Trommer, 2005).…”