Cogeneration for Dummies
#6

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



Attached Files
.rar   chp_bp_cond.rar (Size: 89.89 KB / Downloads: 0)
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Messages In This Thread
Cogeneration for Dummies - by sld - 22-02-2012, 12:07 AM
Cogeneration for Dummies - by Antti-L - 22-02-2012, 08:27 AM
Cogeneration for Dummies - by sld - 23-02-2012, 09:11 AM
Cogeneration for Dummies - by Antti-L - 23-02-2012, 01:16 PM
Cogeneration for Dummies - by sld - 23-02-2012, 11:46 PM
Cogeneration for Dummies - by sld - 10-03-2014, 08:31 PM
Cogeneration for Dummies - by Antti-L - 11-03-2014, 06:38 AM
Cogeneration for Dummies - by sld - 11-03-2014, 08:05 AM
Cogeneration for Dummies - by sld - 12-03-2014, 02:00 AM
Cogeneration for Dummies - by Antti-L - 12-03-2014, 07:17 AM
Cogeneration for Dummies - by sld - 12-03-2014, 07:58 AM
Cogeneration for Dummies - by Antti-L - 12-03-2014, 08:20 AM
Cogeneration for Dummies - by sld - 12-03-2014, 08:52 AM
Cogeneration for Dummies - by sld - 12-03-2014, 08:58 AM
Cogeneration for Dummies - by Antti-L - 12-03-2014, 10:47 AM
Cogeneration for Dummies - by sld - 12-03-2014, 11:09 AM
Cogeneration for Dummies - by sld - 30-03-2014, 10:01 AM
Cogeneration for Dummies - by Antti-L - 31-03-2014, 06:54 AM

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