Effect of Parametric Uncertainties, Variations, and Tolerances on Thermohydraulic Performance of Flat Plate Solar Air Heater

Table 1

Range and baseline values of various design parameters.

Parameter	Values
Transmittance-absorptance product for the absorber plate-glass cover combination,	0.8 (single glass cover)
Gap between the absorber plate and glass cover,	40–80 mm [10]
Collector slope,	40° (winter),; 25° (year round operation),; 0° (summer)
Insulation	Foamed polystyrene or glass wool
Thermal conductivity of insulation material,	0.037 Wm^−1K^−1
Insulation thickness,	≥50 mm
Glass thickness,	≥4 mm
Thermal conductivity of glass,	0.78 Wm^−1K^−1
Long wave emissivity
Glass cover (window glass),	0.88 [20]
Absorber plate,	0.95 (black paint), 0.1 (selective coating)
Duct surface	0.9
Absorber plate (duct side)	0.9 [21]
Length of the collector duct,	Baseline value = 2 m
Duct height,	5–20 mm, baseline value = 10 mm
Width of duct,	1 m