8 Measuring Solar Radiation on a Tilted Surface

The real question now at issue is simply the variability of daily or quite frequent observed values of solar intensity...

Charles F. Marvin

(1858–1943)

8.1 Introduction

When evaluating the performance of a solar energy conversion system, it is necessary to know the irradiance incident on the collector. The incident solar irradiance either can be estimated from the direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI) values, or the incident irradiance can be measured. For concentrating solar power systems (CSP) the DNI is the only irradiance measurement or model estimate needed to represent the energy input to the collector. The global tilted irradiance (GTI) is needed for nonconcentrating ...

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