EXERGY AND CARBON CREDITS FOR SERIES CONNECTED N PHOTOVOLTAIC THERMAL - COMPOUND PARABOLIC CONCENTRATOR (PVT-CPC) COLLECTOR: AT CONSTANT OUTLET TEMPERATURE

In the present study, overall energy and exergy performance of partially covered N photovoltaic thermal - compound parabolic concentrators (PVT-CPC) (25% covered by glass to glass PV module) collector connected in series have been carried out at constant outlet temperature mode. Further, comparison in performance for partially covered N photovoltaic thermal - compound parabolic concentrators (PVT-CPC) [case (i)] and N compound parabolic concentrators (CPC) collector [case (ii)] connected in series have also been carried out by considering a fluid namely ethylene glycol for high thermal performance. It has been observed that [case (ii)] are most suitable for steam and space heating whereas [case (i)] for thermal along with electrical need on the basis of comparative study. The maximum net annual overall thermal energy and exergy for N-CPC collector [case (ii)] which are higher than for N PVT-CPC collectors [case (i)] by 1.5 and 1.3 times, respectively. The kWh per unit cost based on exergoeconomic parameter or exergetic cost for [case (ii)] and [case (i)] has been found to be 0.054 kW h/Rs. and 0.036 kW h/Rs. for 30 years lifecycle with 2% interest, respectively. It has also been observed the environmental cost of [case (ii)] for overall thermal energy is 673.35 $/tCO2e and for overall exergy is 115.89 $/tCO2e for 30 yrs.