[TRNSYS-users] feedwater heater question

[Jeff Thornton]

Looking at your setup, you'll need to use the CLOSED feedwater heater
and not the open feedwater heater. In the open feedwater heater, the
steam mixes with the entering flow and there are only 3 streams; 2 in
and 1 out. In the closed feedwater heater, the steam does not mix with
the condensate and there are four streams; two in and two out. In your
simulation you should connect the outputs of the steam side into mixers
that then mix with the condenser - see the attached image. 

The definitions of the pinchpoints, the TTD and all other inputs and
parameters can be found by clicking the "More" button next to the name
in the proforma. 

Jeff 

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com

On 07/29/2014 8:23 am, 1112102005 at ncepu.edu.cn wrote: 

> Hi all， 
> 
> I would like to conduct a power plant simulation. The feedwater heater is coupled with drain cooler. Take the middle one FWH2 as an example: the feedwater from FWH3 was pumped into FWH2 and being heated by extraction steam from the steam turbine, afterwards, the hot feedwater will flow into FWH1. Besides, the drain water from FWH1 will flow into FWH2 to heat the feedwater, and finally, the drain water will have to go on heat FWH3. Could anyone tell me how to set the parameters ? I tried to connect the FWH2 with five lines: steam inlet and outlet, feedwater inlet and outlet, and drain water inlet but failed. 
> 
> As shown below, what does item 9 and 10 mean? And what does pinch point 1-3 means? 
> 
> Thanks 
> 
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