The present work deals with the energy end exergy analysis of a system which includes photovoltaic panels providing electricity to a bakery oven. The photovoltaic system （PV） on the bakery unit serves as a model for...The present work deals with the energy end exergy analysis of a system which includes photovoltaic panels providing electricity to a bakery oven. The photovoltaic system （PV） on the bakery unit serves as a model for the installation of PV systems in urbanized areas, which could play a major role in the energy self sufficiency, while at the same time playing a role in the reduction of greenhouse gas emissions. The technology of these systems will be analyzed, as well as the installation of such a system in the building of a bakery unit at the Prefecture of Argolida in Greece with coordinates： latitude 37°34′27″North and longitude 22°50′17″ East. The annual average energy production in horizontal level for 1 kW installed power is 1400 kwh. The Kilowatt peak （kWp） needed for the oven system in the specified area is 29.63 kW. This need of energy can be provided by a PV system that is comprised of 129 PV panels ES-200M60（＋） manufactured by EMMVEE Company at 230 Watts of peak power （Wp） each. The installation of a solar cell is studied with energy storage since the bakery shall be operational at 03.00 am. The exergy of the operating system using electricity from the grid was calculated for the oven temperature of 150 ℃ and up to 220 ℃. The exergy and energy efficiencies were also obtained. The heat lost during the time the oven is not operational was taken into consideration. It was found that 50% of the exergy is being lost, despite the fact that a big amount of heat is being recovered.展开更多
文摘The present work deals with the energy end exergy analysis of a system which includes photovoltaic panels providing electricity to a bakery oven. The photovoltaic system （PV） on the bakery unit serves as a model for the installation of PV systems in urbanized areas, which could play a major role in the energy self sufficiency, while at the same time playing a role in the reduction of greenhouse gas emissions. The technology of these systems will be analyzed, as well as the installation of such a system in the building of a bakery unit at the Prefecture of Argolida in Greece with coordinates： latitude 37°34′27″North and longitude 22°50′17″ East. The annual average energy production in horizontal level for 1 kW installed power is 1400 kwh. The Kilowatt peak （kWp） needed for the oven system in the specified area is 29.63 kW. This need of energy can be provided by a PV system that is comprised of 129 PV panels ES-200M60（＋） manufactured by EMMVEE Company at 230 Watts of peak power （Wp） each. The installation of a solar cell is studied with energy storage since the bakery shall be operational at 03.00 am. The exergy of the operating system using electricity from the grid was calculated for the oven temperature of 150 ℃ and up to 220 ℃. The exergy and energy efficiencies were also obtained. The heat lost during the time the oven is not operational was taken into consideration. It was found that 50% of the exergy is being lost, despite the fact that a big amount of heat is being recovered.
