Abstract
The saving of fuel and energy resources is one of the most actual problems for our country. The most part of it consumed by the engineering systems of buildings. Each apartment connected to the district heating system consumes the heat needed to maintain the optimum temperature. Precise and reliable definition of the heat energy is one of the main priorities for increasing its efficiency. It is carried out by heat meters. Modern heat meters are based on tachometric, electromagnetic and ultrasonic measuring transducers of liquid phase flow rates. A comparative analysis of these classes of flow rate transducers and devices based on them allows us to choose ultrasonic flow meters because of their advantages. The classification of ultrasonic methods of flow measuring by ultrasonic wave propagation, the direction of the ultrasound beam relative to the flow, the method of placement of the piezoelectric transducer, the type of acoustic channel and the number of measuring channels is described.The possibilities of their application for heat quantity measuring are estimated. The requirements to the heat quantity units took into account. The requirements for the ultrasonic flow rate transducer in the measuring unit structure are formulated, which will increase its metrological reliability.The direction of further research is grounded in the assessment of the influence of the hydrodynamic parameters of the flow and the operating conditions of the ultrasonic transducer, such as the diameter of the measuring area, the Reynolds number, the presence of local resistances near the installation location and its spatial orientation, the measurement error
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