# Steam consumption calculation on a steam exchanger

1. Apr 18, 2015

### saruvanan

We are having a steam heat exchanger. Its made up of finned tubes.
Tube id 22.7mm
Tube od 26.7 mm
Tube length 1310.0mm
Tube material ss304
Fin od 66.0 mm
Fin thk 1.5mm
No of fins on one tube 260
Fin material ss304
Total no of tubes 10

Supplied steam pressure 3.5 kg/sqcm

A inverted bucket trap is connected at the outlet
Material passed is fabric
Fabric temperature at inlet 68deg c
Fabric temperature at outlet 72deg c

What will be the steam consumption in terms of kgs on this stram heat exchanger

2. Apr 18, 2015

### rollingstein

Too little data but if I had to guess 20 to 100 kg/hr

3. Apr 18, 2015

### Staff: Mentor

Is this a homework problem?

Chet

4. Apr 18, 2015

### Staff: Mentor

How much heat does the fabric have to absorb to raise its temperature by 4C?

That'll be a start, but it is tough to know without seeing a design drawing if there is going to be a lot of heat lost to the air.

5. Apr 18, 2015

### Staff: Mentor

I think that the range of cold side temperatures in the problem statement is provided only to constrain the temperature driving force (i.e., the inlet and outlet temperature differences for the steam). I think the focus is going to be on the tube side of the system, with the OP required to estimate the overall heat transfer coefficient (including the effect of the fins), which will determine the heat load. Once the heat load is known, the required steam flow can be determined. At least that is how I would approach this problem.

Chet

6. Apr 20, 2015

### saruvanan

Thanks for the replies
I've a design drawing. This is no homework. This setup we are having in my company.