According to page 1989 of the "Practical Heating and Air Conditioning Design Manual", when determining the calculation of the cold water volume of the pipe section, the superimposed calculation can be performed according to the rated flow of the terminal equipment (such as AHU, FCU, etc.) connected to the pipeline. However, it must be noted that when the total water volume is equal to the total system flow (water pump flow), the water volume of the main pipe should not be increased. When calculating the resistance along the pipeline, the friction pressure loss per unit length (specific friction resistance) should be controlled at 100 ~ 300Pa / m, usually the maximum should not exceed 400Pa / m
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