Hello,
Assume that we have a vertical water tank with a vertical flue gas pipe that is located right in the middle of it. Flue gas pipe is constantly supplied with a high temperature flue gas that is used to heat up the water inside the tank. Additionally, there are water coils swirled inside the tank, that are constantly supplied with colder water compared to the temperature of the water in tank. Therefore, as the flue gas is heating the water tank, the coils are taking up the heat.
In order to model this, I assumed two heat transfer processes to calculate the two overall heat transfer coefficients:
1) Flue gas to tank
- Forced external flow heat transfer coefficient on the flue gas side
- Pipe wall resistance
- Natural heat transfer coefficient on the tank water side
2) Tank to cold water
- Natural heat transfer coefficient on the tank water side
- Coil wall resistance
- Internal forced flow heat transfer coefficient on the water side in the coil
My question is:
Am I right by using the natural heat transfer coefficients for the tank water side? If so, how will the natural heat transfer coefficients on the flue gas pipe and the water coils differ?
Thank you in advance.
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