Experimental investigation into different selectively coated receivers and silver-coated selective surface compound parabolic reflector using regression modelling for industrial heating

Figures & data

Table 1. System parameters.

Parameter	Dimension
Compound parabolic trough collector length	182 cm
Compound parabolic trough collector width	103 cm
Concentration ratio	16.94 ~ 17
Focal distance of compound parabolic trough collector	22.1 cm
Glass cover thickness on compound parabolic trough collector	3 mm
Insulation thickness of tank	5 mm
Absorber tube inner diameter	1.7 cm
Absorber tube outer diameter	1.9 cm
Rim angle	134.52°
Storage tank capacity	100 L
Tank insulation material	Asbestos

Figure 1. Experimental set-up for evaluation of thermal performance.

Table 2. Uncertainty analysis.

Instrument	Accuracy	Uncertainty (%)
Pyranometer	±5 W/m^2	0.82
Thermocouples	±1 °C	1.3
Wind sensor	±1 m/s	2
Data logger	±1 units	0.5
Rotameter	±2 LPH	2.15

Figure 2. Variation of overall heat loss coefficient and total heat loss with temperature gradient for black Cu-coated Cu receiver.

Figure 3. Variation of overall heat loss coefficient and total heat loss with temperature gradient for black Cu-coated M.S receiver.

Figure 4. Variation of overall heat loss coefficient and total heat loss with temperature gradient for black Zn-coated Cu receiver.

Figure 5. Variation of the overall heat loss coefficient and total heat loss with receiver temperature for black Cu-coated Cu receiver.

Figure 6. Variation of the overall heat loss coefficient and total heat loss with receiver temperature for black Cu-coated M.S receiver.

Figure 7. Variation of the overall heat loss coefficient and total heat loss with receiver temperature for black Zn-coated Cu receiver.

Figure 8. Variation of collector efficiency and receiver temperature with the overall heat loss coefficient for black Cu-coated Cu receiver.

Figure 9. Variation of collector efficiency and receiver temperature with the overall heat loss coefficient for black Cu-coated M.S receiver.

Figure 10. Variation of collector efficiency and receiver temperature with the overall heat loss coefficient for black Zn-coated Cu receiver.