Selection of coil diameter in storage tanks

Shouldn’t this calculate the maximum heat dissipation from the external surface of the storage tank?

The last edit to this post was made by wiseboy on 2020-5-28 at 11:37. The issue isn’t as simple as it seems; it is necessary to 1. calculate the heat loss QL of the storage tank. For this purpose, it is required to determine the heat transfer coefficient K1 of the tank relative to its surroundings, and K1 depends on 1) the material and thickness of the tank’s shell； 2) Types and thickness of insulation materials ； 3) Related to the average local natural wind speed of the storage tank. 2. Calculate the flow rate of the heating medium based on QL and the temperature difference of the heating medium, select an appropriate flow velocity (with turbulence within the pipe as a guiding principle), and use this to determine the pipe diameter. 3. Calculate the heat transfer coefficient K2 of the tube to the liquid inside the tank, and use this value to determine the area (length) of the coiled tube. Calculate the heat transfer coefficient K2. Outside the tube, natural convection generally occurs; there are several forms of natural convection, and it is necessary to determine which type of natural convection is involved ； The pipe interior should fall within the turbulent region. 4. The coil diameter affects K2. . . . . . In short, conducting careful and responsible calculations is quite complex. If it’s an engineering issue, please take it seriously; if you’re a student, that’s all for now.

Insulation material, insulation thickness, heat transfer in the storage tank, ambient temperature… all of these factors have been taken into account. The calculated heat amount is very low, as there is already a heated storage tank; this one is a metering tank, and the coiled tubes serve only to provide insulation. Using the current DN25 coil diameter, the calculated flow velocity is extremely low

Calculations have been done: the storage tank is a metering tank with a volume of 10 cubic meters. Insulation material is used around the tank. There is a heating tank before it, and by the time the fluid reaches the metering tank, it only needs to maintain its temperature; therefore, the amount of heat required for heat dissipation from the tank walls is not very large. The reference manuals contain very little information on coil heating; instead, information on coiled tube heat exchangers and tank heating was consulted. There is even less information available on coil insulation. Looking for recommendations

After calculations, it was found that the amount of heat required for heat dissipation from the tank is very small. A initial diameter of DN25 was chosen; the coiled tubes inside the tank are used for hot water insulation, which means that the fluid flowing within these tubes (hot water) is in very small quantities. Therefore, I wondered whether it might be necessary to reduce the diameter of these coiled tubes further

Which source or standard is being referred to? Looking for recommendations

The energy calculation is complete; the pipe diameter and flow rate need to be specified by the user, after which the calculations can be carried out