Burners configuration impact on the thermal effectiveness of the PTVM-100 (R) hot water boiler P.Stankov1, D.Markov1, Y.Dinkov2, V.Petrov3, D.Toporov1 1 Technical University - Sofia, Dept. of Hydroaerodynamics an Hydraulic Machines, "Kliment Ochridski" No 8, 1000 Sofia, BULGARIA 2 Kozloduy Nuclear Power Plant, Training Center, 3321 Kozloduy, BULGARIA 3 Toplofkacia Sofia Plc., 23 Jastrebetz street, 1680 Sofia, BULGARIA ABSTRACT The paper deals with a numerical investigation of a hot water boiler PTVM 100 ( R ). The specialized software developed by the authors is based on the Favre averaged 3-D transport equations closed with the standard (-( turbulent model. Magnussen's Eddy Dissipation Model and the Discrete Ordinates Method were used for modeling of the turbulent combustion processes and the radiative heat transfer, respectively. Two types of burner configurations are investigated: one, with six swirl type burners located in a row of three on the two opposite walls and the other with four jet type burners located diagonally two by two on the opposite walls. Numerical results obtained show hoand Mohls aon the two opposite walls and the otheabcu0 ( oth o typflux port eqfy tac jet typposctraated diagonbthe thermessr optoel. Man abthe th ctra. Assites aon otheind fas procesabsorb opo typflux 3-De walth Oc10%loped pr oicth sixillivewit Mangs ad M raness of esses bthe thermal effective the PTVM-100 (R) hot water boiler rl type burncialize.