Abstract
The solar cell junction is susceptible to performance degradation, due to internal temperature rise which is further perturbed by ambient temperature rise. The conversion efficiency of the solar module remarkably drops because of temperature rise. The diurnal module temperature hovers above 60 degrees C. It is possible to keep the conversion efficiency high by water-cooled or air blast equipment. This project is a preliminary study of the impact of temperature variation across seasons on the dynamic performance of photovoltaic power system. The photovoltaic (PV) module was mounted on a test rig at latitude 7 degree on top of physics building Obafemi Awolowo University campus. The output voltage of the PV module was applied to a resistive load and system efficiency performance measured over a period of time covering the dry and rainy seasons. Measurements of ambient temperature, PV junction operating temperature, wind speed, solar irradiance, and power delivered were carried out. A numerical algorithm was developed to analyse the data. The transport medium can store heat energy from the solar module, so that a large amount of hot water can be produced. The results show that this thermal transfer benefit, positions the PV system in good stead, for Microgrid: Cogeneration Energy Efficiency functionality. Keywords : Conversion efficiency, Photovoltaic power system, PV module, Water-cooled equipment, Cogeneration.
Highlights
Solar power could be the leading source of electricity if efficient harvesting of adequate amount of the energy delivered to the earth from the sun on a daily basis is possible
3.1 Temperature effects in dynamic PV system The solar cell junction is susceptible to performance degradation, due to internal temperature rise which is further perturbed by ambient temperature rise
The junction temperature of the prototype was monitored by optical temperature sensor; the operating temperature variation over seasons is shown in figure 2
Summary
Solar power could be the leading source of electricity if efficient harvesting of adequate amount of the energy delivered to the earth from the sun on a daily basis is possible. On the equator at noon 1000W/m2 of sun energy touches the ground. Only about 20 percent of this power can be transferred into usable energy (Anderson et al 2003). This inefficiency is directly related to the percentage of photons that are absorbed when sunlight impinges on the PV surface. All electromagnetic radiation, including sunlight, is composed of particles called photons, which carry specific amounts of energy determined by the spectral properties of their source. Photons propagate with wavelength , being related to the photon energy by
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