Jiyun,
For some reason, the combination of your settings caused a floating point problem in the Steam subroutine. We have identified the problem, have fixed it, and are now testing it. When that process is complete, we will release it in an updated version of TRNSYS 18. Our apologies for the bug.
As for your second question. The feedwater heaters can be cascaded without issue. Simply connect the outlet steam flow from the feedwater heater to the inlet steam flow to the next feedwater heater.
Jeff
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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@tess-inc.com
On 07/24/2018 11:16 am, qin.jiyun--- via TRNSYS-users wrote:
Dear Someone,I'm using TESS library to build a 300 MW subcritical regenerateive Rankine cycle power plant with seven closed Feedwater heater and one deaerator. I have a problem for simulating the feedwater heater system of power plant. I found that when I add the Type622 component in the model, the model woule be got stuck, and if I delete the Type622 component, the model can be run. I find that there are no linking or setting problem of my model. What's the problem of my model? Please find attached model.I have another question about Type622. I found that there are no inputs for drain steam from higher pressure feedwter heaters. Is this means that TESS library can not be used to simulate the Rankine cycle power plant with more than one closed feedwater heaters?Best Regards,Jiyun Qin
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