Abstract
The hourly solar radiation data required for solar energy system design evaluation and performance studies is gener-ally not available for a number of sites especially in remote locations. As such accurate determination of hourly solar radiation data, is important both at horizontal; surfaces and inclined surfaces. A model to estimate global solar radiation using temperature and sunshine hour data has been developed (Chandel et al. [1]) which is used to calculate the hourly solar radiation Data. The hourly solar radiation has also been calculated using Gueymard [2] daily integration approach from the measured daily solar radiation data. These two predicted hourly solar radiation data values are compared with measured hourly values to test the accuracy of the models. The total solar radiation on the inclined surfaces and vertical surfaces for different orientations, have also been estimated. The estimated values are found to be in close agreement with measured values. The method presented can be used to estimate hourly, global, diffuse solar radiation for horizontal surfaces and total solar radiation on inclined and vertical surfaces at different orientations with greater accuracy for any location.
Highlights
The measured hourly values of solar radiation data are not available for large number of stations
The hourly solar radiation data required for solar energy system design evaluation and performance studies is generally not available for a number of sites especially in remote locations
Accurate estimation of hourly values of global and diffused solar radiation data is essential for the design and performance evaluation of solar energy systems
Summary
The measured hourly values of solar radiation data are not available for large number of stations. The hourly solar radiation can be estimated using Gueymard [2] daily integration approach It requires measured value of daily solar radiation, which is not available for most of the locations. The values of solar radiation obtained using this model are used to estimate hourly solar radiation following Gueymard [2] daily integration approach. In order to verify the accuracy of the results obtained, the hourly solar radiation is estimated from the measured daily solar radiation data for Delhi. This method is first used to predict hourly global solar radiation for Delhi [Latitude 28.58 ̊N, Longitude 77.2 ̊E, altitude 216 m (amsl)] for which 10-15 years measured data are available. The relation given by Klein [4] does not predict accurate results on north orientation, which is modified for the months with negative declination
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