By simulating the temperature change in the pipeline under different transportation conditions, it is known that the initial temperature of gas and supercritical medium in the pipeline is higher than the ambient temperature, so the heat is released to the environment. With the extension of the pipeline distance, the final temperature will be consistent with the pipeline temperature, and the temperature change value will be positive. However, the temperature of the medium in the liquid pipeline at the starting point is much lower than the pipeline temperature, so it will continuously absorb heat from the external environment until the temperature is consistent with the pipeline, so the temperature change is negative in contrast to the former two.
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