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Figure 4.17 shows the temperature distribution in the receiver area and the conduction heat loss from the aluminium extrusion solid components for two different boundary conditions.
Figure 4.17: Temperature contours in the receiver area (a) adiabatic all side walls (b) convection boundaries, showing heat loss from the aluminium extrusion
= ∑ other loss Other loss Glass top cover 31 Glass side cover 30 Base surface 3 Side aluminium extrusion 1 Aluminium extrusion top corner 2 Silicon adhesive top 6 = ∑ other loss 73
Streamlines near the receiver are shown in Figure 4.21 and indicates the hot fluid flow rising up near the aluminium extrusion surface and spreading mainly under the top glass cover.
The end walls and aluminium extrusion side walls were modelled as convection boundaries with external heat loss
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