Overall Loss Coefficient in Solar Energy Systems Formulas

Overall loss coefficient is defined as the heat loss from collector per unit area of absorber plate and temperature difference between absorber plate and surrounding air. And is denoted by U_l. Overall Loss Coefficient is usually measured using the Watt per Square Meter per Kelvin for Heat Transfer Coefficient. Note that the value of Overall Loss Coefficient is always positive.

Solar Energy Systems formulas that make use of Overall Loss Coefficient

fxHeat loss from collectorGo

fxCollection efficiency when heat removal factor is presentGo

fxCollector heat removal factorGo

fxCollection efficiency when average transmissivity-absorptivity product is presentGo

fxCollection efficiency when collector efficiency factor is presentGo

FAQ

What is the Overall Loss Coefficient?

Overall loss coefficient is defined as the heat loss from collector per unit area of absorber plate and temperature difference between absorber plate and surrounding air. Overall Loss Coefficient is usually measured using the Watt per Square Meter per Kelvin for Heat Transfer Coefficient. Note that the value of Overall Loss Coefficient is always positive.

Can the Overall Loss Coefficient be negative?

No, the Overall Loss Coefficient, measured in Heat Transfer Coefficient cannot be negative.

What unit is used to measure Overall Loss Coefficient?

Overall Loss Coefficient is usually measured using the Watt per Square Meter per Kelvin[W/m²*K] for Heat Transfer Coefficient. Watt per Square Meter per Celcius[W/m²*K], Joule per Second per Square Meter per Kelvin[W/m²*K], Kilocalorie (IT) per Hour per Square Foot per Celcius[W/m²*K] are the few other units in which Overall Loss Coefficient can be measured.

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