Ultrasonic heat meter uses ultrasonic time difference method to measure the flow rate of fluid, which is one of its technical cores. The basic principle of ultrasonic time difference method is that the propagation speed of ultrasonic signal in fluid will be affected by the flow rate of fluid. When ultrasonic signal propagates downstream in fluid, its speed will increase; and when ultrasonic signal propagates upstream, its speed will slow down.
In specific implementation, ultrasonic heat meter usually installs a pair of ultrasonic transducers (transmitter and receiver) in the fluid pipeline, which are located on both sides of the pipeline. During the measurement process, the ultrasonic transducer alternately emits ultrasonic signals and calculates the flow rate by measuring the time difference of signal propagation in the fluid. Then, according to the flow rate and the cross-sectional area of ​​the pipeline, the flow rate of the fluid can be calculated.
In addition to flow measurement, ultrasonic heat meter also needs to accurately measure the inlet and outlet water temperature in order to calculate the temperature difference. To this end, ultrasonic heat meter is usually equipped with a pair of high-precision temperature sensors, which are installed on the inlet and outlet pipes of the heat exchange system. These temperature sensors can collect and transmit water temperature data in real time to ensure the accuracy of heat calculation.
After obtaining the flow rate and temperature difference data, the ultrasonic heat meter uses the heat calculation formula in the thermodynamic principle to calculate the heat obtained by the heat exchange system. This formula usually involves parameters such as fluid density, thermal enthalpy value, flow rate and temperature difference. During the calculation process, the ultrasonic heat meter will also make some compensation and corrections as needed to ensure the accuracy and reliability of the heat calculation.
The integrator in the ultrasonic heat meter is a key intelligent processing component. It is responsible for collecting signals from flow sensors and temperature sensors, and performing preprocessing such as filtering, amplification and A/D conversion. Then, the integrator uses the embedded processor and the pre-stored heat calculation formula to perform real-time calculations to obtain the heat value obtained by the heat exchange system. At the same time, the integrator can also store the calculation results and transmit and exchange data with the host computer or other devices through the communication interface.
Ultrasonic heat meters are widely used in various heat exchange systems due to their advantages such as accurate measurement, flexible installation and convenient maintenance. It can be used to measure heat consumption in heating systems, heat transfer in industrial cooling systems, and cooling capacity in air-conditioning systems. In addition, ultrasonic heat meters also have the characteristics of waterproof, dustproof and corrosion-resistant, and can work normally in harsh environments.