TY JOUR TI CALCULATION OF CAPACITY OF ADDITIONAL SOURCES OF HEAT FOR HEAT BIO-MASS IN BIOGAS REACTOR KW biomass KW biogas KW reactor KW Fourier heat equation KW heat sources KW temperature field KW boundary conditions of the first kind JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Vendin, S.V. AU Mamontov, A.Y. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov