Principle and Operation Instructions for Measuring the Shell Thermal Conductivity of Insulation Pipes

The insulation pipe shell thermal conductivity measurement device is based on GB/T 10296-2008 "Determination of Steady-State Heat Transfer Properties of Insulation Layers by Circular Pipe Method" and ISO 8497:1994 "Insulation - Determination of Steady-State Heat Transfer Characteristics of Insulation Layers of Circular Pipes". It is suitable for various rubber pipes, extruded pipes, rock wool, glass wool, and various insulation pipe shell materials. This instrument is used to test the heat transfer coefficient, thermal conductivity, and thermal conduction analysis of the surface of circular pipes, using virtual instrument technology for detection and analysis. 1. Principle The device consists of a heated test pipe and temperature control and measuring instruments. The instrument controls and measures the temperature of the test pipe and the surrounding air, as well as the average power consumed by the heater in the measurement section. Unless only the heat transfer rate needs to be determined, it also includes instruments for measuring the surface temperature of the insulation material. The test pipe is uniformly heated by an internal electric heater (the resistance wire is wound around a separate internal pipe). Calibration and calculation end devices (see Figure 2) use insulation caps at each end of the measurement section to minimize axial heat flow. The correction for heat loss from the end insulation caps is determined by direct calibration under test conditions. The internal electric heater provides uniform heating along the length of the measurement section. End heaters are used near the length of the measurement section. The end caps have the same cross-sectional area and similar heat transfer characteristics as the test specimen. Each end cap has a cavity that measures the radius of the test pipe. 2. Operation Instructions 1. Remove one end cap of the sample pipe and place the test sample over the sample pipe; 2. Attach the temperature sensor inside the sample bucket to the sample in a third of the way and secure the end cap; 3. Turn on the power of the instrument; 4. Open the testing software on the computer, set the test parameters, and click to start data collection; 5. Set the required test temperature and click to start heating; 6. Once the temperature reaches the set temperature, click to calculate; 7. The test can be concluded once the data stabilizes.

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