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Exergy Assessment of Roof Integrated Photovoltaic Thermal RIPvT System for Sub Saharan Tropical Regions

Ekoe A Akata Aloys Martial, Basant Agrawal, Donatien Njomo

Photovoltaic systems when integrated in the building structure can satisfy the world’s energy requirements at competitive cost by providing onsite electrical and thermal energies for domestic appliances. The energy yield of the photovoltaic system is affected by the intensity of the solar radiation, wind speed, tilt angle, orientation, geographical location, etc. This paper presents a thermal modeling of a Roof Integrated Photo Voltaic Thermal System (RIPVT). A methodology has been developed to optimize the tilted angle of the roof for higher exergy output including the intensity of solar radiation, wind speed, tilt angle, orientation, geographical location, cost of cleaning dust, etc. For a system installed in the city of Douala, Cameroon, it’s recommend that RIPVT should inclined at an angle between 10º to 20° South facing for economic output. The cost per unit electricity between the tilt inclination angles from 0° to 20° with South orientation is USD 0.04 per kWh. The cost of electricity loss due to 20° tilt inclination angle can be compensated with the labour cost and work required for cleaning the RIPVT system of the h orizontal roof. The system installed over an effective area of 8 m² is capable of producing annual net exergy of 2195.81 kWh/year at an efficiency of 11.8 percentile.