TRANSIENT BEHAVIOUR OF VOLUMETRIC SOLAR RECEIVERS
Palavras-chave:
Volumetric solar air receiver, Transient modeling, Thermal non-equilibrium modelResumo
The transient behaviors of the volumetric solar air receiver are crucial for understanding
and optimizing the receiver characteristics. The present work numerically analyzes the transient
behaviors of the volumetric solar air receiver under various working conditions. Effects of inlet velocity,
and thermal conductivity ratio s f k / k
on equilibrium temperature was investigated. Higher inlet
velocities attain quicker stabilization times and decreases equilibrium temperature, Teq. In addition,
increasing s f k / k
increases stabilization time as well as equilibrium temperatures. The results are useful
in designing of volumetric solar air receivers and the thermal efficiency increases for lower inlet
velocities and higher thermal conductivity ratios, whereas η is reduced for more permeable structures
and higher porosities. Thermal efficiency (η) increases for lower inlet velocities and higher thermal
conductivity ratios.
