N2 - The paper presents a modified algorithm for choosing the optimal coefficient of the share of cogeneration in district heating systems taking into account additional benefits concerning the promotion of highefficiency cogeneration and biomass cofiring. The optimal coefficient of the share of cogeneration depends first of all on the share of the heat required for preparing the hot tap water. The final result of investigations is an empirical equation describing the influence of the ratio of the heat flux for the production of hot tap water to the maximum flux for space heating and ventilation, as well as the share of chemical energy of biomass in the fuel mixture on the optimal value of the share of cogeneration in district heating systems. The approach presented in the paper may be applied both in back-pressure combined heat and power (CHP) plants and in extraction-condensing CHP plants. L1 - http://www.czasopisma.pan.pl/Content/94520/PDF/07_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/94520 PY - 2014 IS - No 1 March EP - 115 DO - 10.2478/aoter-2014-0007 KW - cogeneration KW - combined heat KW - combined power KW - district heating systems KW - guarantees of origin KW - biomass co-firing A1 - Ziębik, Andrzej A1 - Gładysz, Paweł PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2014 T1 - Influence of biomass cofiring on the optimal coefficient of the cogeneration share in a district heating system SP - 99 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/94520 T2 - Archives of Thermodynamics