I'm modelling cogeneration for the first time, and I'm not an expert in the field. For that reason, I first decided to create a tiny RES to see what happened when I changed each parameter. My aim is to understand well how it works, first technically, then add costs etc, and then add cogeneration into my model.
But I haven't been able to make my tiny model behave as I'm expecting. I mean, I have a solution value of zero, but I can't see the flows in and out of the different processes, which is what I'm interested in.
The RES contains coal imported, cogeneration (backpressure) using that coal, an electricity demand consuming the electricity, and a demand process consuming that heat.
If you can please see the attached files, I'd be more than grateful.
At first, I added an export process for the heat (so there was a demand process consuming electricity, with a COM_PROJ associated, and the heat was exported). I couldn't see the heat actually being exported, or any flows in and out of cogeneration or any other process. So then I tried with the demand for the heat in the internal region, but didn't input COM_PROJ for it, expecting the model to calculate it (which may be a mistake).
I think the cogeneration process is not well defined. I used ACT_EFF for the total efficiency (electrical + thermal), is this correct? I'm using the numbers from the example in Veda-Getting started doc.
Regarding units, is it possible to have ELEC in PJ, and HEAT in thousand tonnes?
Thank you very much, and sorry for such a basic and long question.
If you don't want to take the time seeing the files, but want to share a database that includes cogeneration (gams file or Times) that I can play with, it will also be a big help.
Thanks
Sara
uploads/37/chp_gams.raruploads/37/CHP_times_database.rar