# Need help in solving thermo problem

• Ossdon

#### Ossdon

Hi
The thermo problem is as follow:
I have a fireplace and I have an underfloor water pipe heating. currently the underfloor water is heated by gas burner.
I want that the water will also be heated by the fireplace, so I plane to place a chopper pipe inside the fireplace and run the underfloor water trough it.
I need to find out what should be the length of the chopper pipe inside the fireplace.
Here are the parameters:
Fireplace temperature = ~ 1000'C
Chopper pipe diameter: Inside = 11mm, Outside = 13mm.
water speed in the pipe = 2500L/hour.
water temp at the start of the pipe is 23'C.
water temp at the end of the pipe should be 55'C.

what should be the length of the chopper pipe inside the fireplace so water entering the pipe in 23'C exit the pipe in 55'C?

Whats I'm asking is, how long it takes for a 23'C water to heat up to 55'C in a 1000'C oven.

Please replay with the relevant equations and the way to solve the problem.

Tnx a lot
Ilan