Energy analysis of a CHP plant with internal combustion engines, for a district heating system, based on the information from the annual databaseGabriel Mărcuş, Vlad Iordache, Florin Iordache and Anica IlieE3S Web Conf., 85 (2019) 01012DOI: https://doi.org/10.1051/e3sconf/20198501012