Abstract
Sediments on the heat exchangers surfaces reduce the heat transfer coefficient and heat exchange efficiency, and lead to significant energy losses. The paper discusses the method of express control of the sediment thickness on heat-exchange surfaces. The method is based on the analysis of attenuation of free oscillations parameters of the controlled product. Studies were conducted on models of the heat-exchange equipment surface, namely steel plates of 400 mm long, 160 mm wide and 2 mm thick, with different sediments thicknesses of 0, 1.0, 1.5, 2.0, 2.5 mm. The Wilcoxon’s rank sum test was used to determine the dynamics of the spectra changes. Studies have shown that the free vibration method allows one to determine not only the presence of deposits on the heat-exchange surfaces, but also their thicknesses.
Highlights
The sediments formed on the heating surfaces of heat exchangers are referred to lowtemperature
In addition to reducing heat transfer, the deposition of scale on the wall leads to an increase in the temperature of the heat exchanger surface
Usage of contaminated heat exchangers in heat supply systems result in an increase in coolant flow rate and an increase in temperature in the reverse pipeline
Summary
The sediments formed on the heating surfaces of heat exchangers are referred to lowtemperature. Usage of contaminated heat exchangers in heat supply systems result in an increase in coolant flow rate and an increase in temperature in the reverse pipeline. This causes an increase in pump power consumption and heat losses in pipelines [2]. Widespread ultrasonic thickness gauges cannot solve the problem It happens because the structural heterogeneity of the sediments leads to a high attenuation of the ultrasonic signal with a significant level of structural interference making it difficult to perform measurements. Thickness determination should be performed from the outside of the heat-exchange surface during operation
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