Thermal Performance Improvement of Solar Parabolic Dish System Using Modified Spiral Coil Tubular Receiver

Table 3

Design parameters, material properties, and dimensions of collector and modified absorber.

Description	Value (all dimensions in mm)
Diameter of PD	1400.0
Focal length of the PD	272.2
Depth of the PD	450.0
Rim angle	45°
Material of PD	Anodized aluminium
Collector reflectivity	0.82
Intercept factor	0.98
Length of spiral tube	2286.0
Diameter of spiral tube	10.0
Inner diameter of copper coil	76.2
Outer diameter of copper coil	152.4
Emittance value for absorber	0.11
Absorbance value for absorber	0.836
Tube material	Copper
Thermal conductivity of copper	385 W/mK