TY JOUR TI EFFECTS OF MECHANICAL VIBRATIONS ON ICE FORMATION ON EVAPORATOR OF AIR HEAT PUMP KW evaporator KW air heat pump KW frostbite KW ultrasound KW piezoceramic emitters JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Orlov, P.A. AU Il'ina, T.N. AU Orlov, K.P. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov