Comparação entre a instalação de um biodigestor ou um sistema fotovoltaico em uma unidade produtora de leitões em Medianeira

Abstract

With the increasing cost of electricity, ways are being sought to reduce the cost of energy bills. This work aimed to compare the economic viability of installing two electrical energy generation systems, one through a system with a biodigester and engine generator group, and the other through a photovoltaic system, in order to 1reduce expenses in one piglet production unit (UPL) in the interior of the municipality of Medianeira - PR. The production of electrical energy from the waste from the matrices that UPL has been estimated (using the Biogás Invest website), first taking into account the daily generation of waste to be able to size the biodigester and the motor generator group. The designed system would be capable of generating 9908 kWh per month and has an approximate budget of R$300,000.00. Based on the budget for the biogas system, a budget of the same value was obtained (from a company in the region) for the photovoltaic system, consisting of 1 inverter, 200 panels, with an average monthly generation capacity of 12,000 kWh. Through financial engineering resources, it was found that the photovoltaic system achieved more satisfactory results more quickly, with Payback of 3.09 years, IRR of 38.3% and NPV of R$ 890,181.61. The system with biodigester obtained a Payback of 8.5 years, IRR of 17.69% and NPV of R$ 213,139.10. While the photovoltaic system has little maintenance, the main reason why the biodigester was not as interesting is its high cost with periodic maintenance. Therefore, the installation of the photovoltaic system was recommended for the case under study.