TY JOUR TI INFLUENCE OF THERMAL PHYSICAL PROPERTIES OF BIOGAS COMBUSTION PRODUCTS ON THE THERMAL PARAMETERS OF WATER HEATING BOILERS KW biogas KW alternative fuel KW local gases KW natural gas KW properties of combustion products KW thermal conductivity KW viscosity JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Leonov, E.S. AU Trubaev, P.A. PY 2024 IS 9 PB Belgorod State Technological University named after V.G. Shukhov