How to calculate pipe heat loss (cold loss)
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I wonder if the seniors here know how to calculate the heat loss (or cold loss) of pipes? I asked for help in the PROII section before; it seems that PROII cannot be used for simulation. . .
The chemical process design manual provides rough estimates for calculating insulation. I don’t have the manual with me right now; I remember there was a table that could be used for searching
This problem is actually a typical heat transfer calculation; for pipes, it can be calculated using the theory of heat transfer in circular walls – refer to the sections on heat transfer in chemical engineering principles.
Take a unit length of pipeline as the object of study (F_in, T_in, T_out are known or can be measured using instruments). Material balance: F_in = F_out. Heat balance: Q_in = Q_out + Q_loss. Q_in = F_in × H_in (H_in can be obtained from tables using T_in). Q_out = F_out × H_out (H_out can be obtained from tables using T_out). Q_loss = Q_in – Q_out. Total Q_loss = Q_loss × L
In the design of petrochemical pipelines, there are tables used for estimation; these tables determine heat losses based on the size of the pipelines and the temperature of the fluid flowing through them. You can look them up by yourself