RE: Tank coils

i dont have the quick and dirty formula but here's how im going to approach the sizing of the tank coils
Assumption: Its helical coil, you h ave a mixing eductor inside the tnak and youre using a low pressure steam.
Heat and mass balance:
Heat given off by the steam is equal to the ehat absribed by the product inside the tank

Q=w(delta h). steam table will give the value of delta h Now Q is also =UA(delta t)
For coils, you may refer to chilton chem eng'r handbook Table 10-8. for the value of U.
Given the delta t, solve for A (surface area). also A=pi x coil dia x coil lenght L. Calc for L. If u know the dia of the helical coil, then u can solve for the no. of coil turns.

Please note that there are other factors to be considered such as the position of the coil, flow rate and the turbelence of the stream. Most of our heater in the tanks are either Shell and tube or haripin type - worth considering as an alternative.

> ----------
> From: A. M. Finke[SMTP:twobarb@yahoo.com]
> Subject: [PipingDesign] Tank coils
>
> Can anyone tell me a quick and dirty formula for sizing what the
> appropriate surface area of tank coils should be.
> probably based on outside air temp, surface area of the tank, and steam
> temp.
>
Received on Sat Oct 20 09:39:00 2001