Abstract
Control of integral heat losses energy facilities during operation and fire tests are accompanied by an intensive heat transfer process in which the values of the surface heat flux reach about 200 kW/m2. Measurement of the heat flux is carried out using contact (heat flux sensors) and contactless (radiometers of measuring instruments) sensors, which must be calibrated in the appropriate range. The aim of the article is to analyze the ways of forming the thermal radiation heat flux in the range of values (1∙-200) kW/m2 and to determine the factors influencing the accuracy of reproduction of the unit of measurement. The main factors are the uniformity of the thermal field formed in the plane of the receiving surface of the measuring instrument, and the contribution of the convective component to the resulting heat flux.The analysis of the heat field homogeneity on the heat sink surface was performed by computer simulation in the ANSYS package. In simulation studied the heat radiation intensity in a closed cavity at the variation of the distance between the heat radiation source and the heat sink surface at fixed cavity widths. For verification of the computer simulations results, experimental studies of the heat field distribution on the surface of the heat sink were performed using a multi-section heat flux sensor.
Highlights
Research and modernization of heat and power facilities, energy-intensive technologies, introduction of new energy efficiency measures are closely related to the measurement, operational control and regulation of thermal processes, the informative characteristic of which is heat flux
Reliable heat flux values are important for reducing global energy consumption in the world, as they are a direct indicator of heat loss of facilities
Significant spread of surface heat flux direct measurement is appeared primarily due to its advantages such as the ability to measure, control and regulate the thermal processes of almost any object of any material, the condition of which can be assessed by uneven heat field distribution
Summary
Research and modernization of heat and power facilities, energy-intensive technologies, introduction of new energy efficiency measures are closely related to the measurement, operational control and regulation of thermal processes, the informative characteristic of which is heat flux. Significant spread of surface heat flux direct measurement is appeared primarily due to its advantages such as the ability to measure, control and regulate the thermal processes of almost any object of any material, the condition of which can be assessed by uneven heat field distribution. 200 kW/m2, which has a significant impact on the environment, accompanies the operation of energy facilities and fire tests [2, 3]. To control these parameters, measuring instruments are used, which must be calibrated in the appropriate range. It is important to ensure the reproduction of the unit of measurement of surface heat flux density at high-intensity heat transfer
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