Table 4 Experimental measurement uncertainty and overall prediction value uncertainty.

From: Performance enhancement of solar air heater using V baffles

Parameter

Unit

Values

Measurements during study

Velocity uncertainty

m/s

± 0.20

Temperature uncertainty

˚C

± 2.86

Irradiance uncertainty

W/m2

± 0.40

Values predicted for air heater

Uncertainty in energy gain (useful power)

W

± 1.086 a

Thermal efficiency uncertainty

%

± 0.003 b

  1. aNominal value is taken to be 37.908 W.
  2. bNominal value is taken to be 0.12%.