Dataset on combined convective loss from a bicylindrical cavity receiver
Description
Tables B1 to B15 represent temperatures of the bottom wall and top wall of the cavity receiver as well as the base wall. The location of the temperature sensors is shown in Fig. 1(b). All temperatures are recorded under the constant surface heat flux of 1770 W/m2. The steady-state temperatures reported in the tables are obtained when the changes in recorded temperatures did not exceed 1°C per hour. For comparison, the wall temperatures for no wind condition (still air) are also provided. The locations where each temperature are recorded are included as dimensionless distance from the cavity base. Hence, a zero dimensionless distance represents the base wall and the dimensionless distance 0.9 is for the nearest temperature sensor to the aperture. In order to calculate heat losses due to the conduction in insulation layer, a total of 6 temperature sensors are used to record the outer surface temperature of insulation. The surface temperature in the wind condition has a considerably lower value than the no-wind case. Furthermore, the temperatures decrease along the cavity surface as wind speed increases in all wind directions. In all cases, a temperature jump is observed, which has a similar trend to that of the no-wind case. The flow instability is affected by the sharp corner between the two cylinders as well as the particular shape of the cavity. Additionally, passing the hot air out to the ambient is prevented by the sharp corner, hence causes a rise in temperature. Since the cavity base is unheated, another temperature rise can be seen near the base. Under the back-on wind, the surface temperature is higher compared to the other wind directions at all wind speeds. In this case, the wind suppresses the inlet air flow to the cavity, and thus, the temperature rises.