Hi, I have some cost data for some cogeneration plants, but I don't know if they are for electricity only or for electricity and heat. I suspect they are only for electricity, though (yet I know they produce steam).
For that reason, to see how they behave with the costs data I have, I created 2 tiny RES with just one process each, one with a CHP backpressure, and one with a condensing CHP.
The Backpressure CHP model works as I expect. The Condensing one doesn't. It may be for lack of data and also because of how I specified it, which is not complete.
The only technical data I have is:
Electrical efficiency at maximum capacity=0.454, Thermal efficiency= 0.316. NCAP_CHPR= 0.696 (calculated using previous efficiencies).
So in the condensing CHP I included NCAP_CHPR_UP=0.696; NCAP_CEH=0
I get this message in the quality_assurance_log (Answer).
*** CHP process with zero CEH but only upper bound on CHPR.
*01 WARNING - Unusual CHP operation: R=WEU P=EWIN2
What other specification could I add with the data I have? I mean, what number can I use for NCAP_CHPR_LO?
Something that calls my attention is that the VAR_ACT is lower than the VAR_FLO_OUT (I defined the activity as the electricity produced), so I thought they should be equal.
I am doubting my little exercise will help me to realise what the cost data represents, but at least I get to learn how to specify a Condensing CHP in the right way J
Thanks!!
PS: I attach the files from the 2 runs.uploads/37/chp_bp_cond.rar