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Table 2 Estimated uncertainties for input variables

From: Transient Uncertainty Analysis in Solar Thermal System Modeling

Input variable Source Standard random uncertainty Standard systematic uncertainty
I diff Hourly values given in TMY3 1% of maximum daily 10%
I beam Hourly values given in TMY3 1% of maximum daily 16%
T amb Typical uncertainty in temperature sensors 1 °C 1 °C
q LD Estimation (engineering judgment) 5 W 5 W