Abstract
This paper compares the result generated by the Regenerator technique and the Ideriah’s method for instantaneous solar radiation. It considered the generation of the actual power input from the regenerator. The actual power input to the photovoltaic panel was calculated from a power model derived from the regenerator’s standard power that is nominally provided, regenerator material and reflectivity of the material. The amount of visible radiation absorbable by photovoltaic plates was further derived in the model and a value of 0.386Pi was obtained. The Ideriah’s model was used to calculate global solar radiation from extraterrestrial solar radiation. It utilized the concept of transmittance to arrive at the amount of insolation received locally (i.e. at the point of interest). It also calculated the amount of insolation at optical thicknesses (Air mass values) representing top of the hour from 5.0am to 7.0pm. Comparison & result showed that the regenerator model gave 84% to 97% correctness or an approximated average correctness of 94% when compared to the Ideriah’s model. Chi-square was used to test the relationship between the results. Chi-square results showed a high level of significance in the similarity of the results obtained. Python software was used to simulate the results and graph presentation.
Highlights
Regenerator technique and the Ideriah’s method for instantaneous solar radiation
The ever growing desire to divert the utilization of energy by man and equipment to be derived from an amazing point of nature which has been found to be free and in relative abundance – the solar energy – cannot be over emphasized. This solar energy has been found to vary from place to place on the earth’s surface and according to environmental provision has a value of up to (4.0 – 6.5) Wh/m2/day in Nigeria [1]
The Regenerator model, utilizes the power model to calculate the amount of radiation absorbed by the photovoltaic panel and takes a record of the output of each of those absorbed energy since the power provided at the regenerator are standard power and posits that when the same panel is exposed to solar radiation, the panel output would generate the same value as it would, when the regenerator was in position [6]
Summary
Analytical method was used to derive the actual power input from the regenerator. A. Neglect distance of thermal source from all surfaces ii. Thermal source conforms to standard ratings in watts. Radiation on regenerator surface losses no energy This model tells us the amount of radiation released by the regenerator (ActualPi) and the amount of this radiation absorbed by the Photovoltaic panel (AbsorbedP) Let power input = Pi , total reflectivity = Rf, and Let power = P. Actual amount of input wattage (i.e. incident radiation):. If % Actual amount of radiation in the visible bandwidth be δ; Actual absorbed power by PV cell or Panel absorbed power:. This model is used as a validation tool for the hourly radiation estimation carried out with the photovoltaic panel. Considering that optical thickness is a function of the zenith angle which varies with the time of the day (ti),
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