User talk:Nuel261

ANuel261 (talk) 17:46, 16 March 2017 (UTC)N EMPIRICAL STUDY OF GLOBAL SOLAR RADIATION VIA CORRELATION WITH SATELLITE METROLOGICAL DATA IN IKEJA, ENUGU, SOKOTO AND MAIDUGURI authours: Oluwaleye Olufemi Emmanuel*, Kolebaje Olusola**, Arowojolu Adewale*** Correspondence Author: E-mail: oluwaleyeolufemi@gmail.com The monthly average global solar radiations in ikeja, enugu, Sokoto and Maiduguri are estimated. The regression and correlation analyses were performed between the metrological data, extraterrestrial radiation, the maximum and minimum temperature data, air temperature, atmospheric pressure, relative humidity, Insolation Clearness Index, Insolation Incident on a Horizontal Surface. Model validation was performed by using the Mean Bias Error (MBE), Root Mean Square Error (RMSE), and Mean Percentage Error (MPE). The proposed equations showed a good agreement with the measured radiation data obtained using pyranometer. keywords- Gunn Bellani, radiometer, albedo, estimation, pyranometer Nuel261 (talk) 17:46, 16 March 2017 (UTC)
 * Department of Physics, University of Benin, Benin city, Nigeria

INSTRUMENTATION FOR A THESIS TITLED ESTIMATION OF GLOBAL SOLAR RADIATION
At the Nigerian meteorological agency, global solar radiation is measured through the use of the Gunn-Bellani radiometer (GB), which is a simple, cheap and easy to maintain instrument commonly used in solar radiation estimation and evaporation studies [8]. The instrument provides a time-integrated assessment of radiation falling on a black body by measuring the volume of liquid distilled by the radiation. It is available in two forms: water filled for daily radiation of up to 6.28MJm-2 and alcohol filled for daily radiation of up to 37.68MJm-2. It requires neither powering nor any special skill to operate and has been found suitable for field estimation of daily total radiation. The liquid is contained in a thin walled copper sphere blackened externally. Sealed into this, with its upper end above liquid level, is the distillation tube. The latter collects liquid distilled from the bulb in its lower section, which is graduated in 0.1 ml divisions. The bulb holds about 42 ml of the working fluid. Initially, the liquid is transferred to the copper sphere by inverting the instrument, and the level remaining in the graduated receiver is noted. When exposed to solar radiation, the fluid in the blackened copper sphere vaporizes and condenses in the graduated receiver. Periodically, or at the end of each day, radiation level is recorded. Folayan (2000) calibrated GB readings with pyranometer readings and came up with a conversion factor, which may be mathematically expressed as: 1〖ml:_GB=1.357(±0.176)MJm^(-2) Nuel261 (talk) 17:52, 16 March 2017 (UTC)