11-11-2010, 11:17 PM
Antti, this is very interesting. I would not have expected that some (or most) of the variables in TIMES are declared as non-negative. In fact, I have not observed negative emissions in the supply sector, the electric sector, or any of the sectors. I have only seen them go to zero. I just assumed that the model was able to go below zero in some sectors but for some reason it tried to force emissions back to zero if emissions were not too far below zero. So what you've said makes very good sense. However, it would still be good to receive a bit more explanation on how to set a negative lower bound on sectoral emissions.
As of now, my I calculate emissions in each sector in my model. In other words, supply sector technologies produce supply sector emissions (SUPCO2), transport sector techs produce transport emissions (TRACO2), and so on for the electricity, industrial, commercial, agricultural, and residential sectors. Then, I use a ~COMAGG table to aggregate these sectoral emissions into a total emissions commodity (TOTGHG_IN). [The "_IN" stands for emissions within the state of California.] It is this total emissions category for which I set an upper limit emissions cap. I use the attribute "COM_BNDNET" to do this. Please see the file attachment. uploads/29/Scen_CO2_Cap.zip
Are you saying that I should (in this file or another) define a lower limit on "COM_BNDNET" for each of the sectoral emissions, thereby over-writing the default TIMES assumption that their lower limit is zero? In an earlier post, you mentioned the attribute "VAR_COMNET", but I think this is a VEDA-BE variable, and not a VEDA-FE variable, correct? If I am right in this way of thinking, then should I just specify the limit to be ridiculously low, so that it never binds (e.g., -1,000,000,000 ktons)?
As of now, my I calculate emissions in each sector in my model. In other words, supply sector technologies produce supply sector emissions (SUPCO2), transport sector techs produce transport emissions (TRACO2), and so on for the electricity, industrial, commercial, agricultural, and residential sectors. Then, I use a ~COMAGG table to aggregate these sectoral emissions into a total emissions commodity (TOTGHG_IN). [The "_IN" stands for emissions within the state of California.] It is this total emissions category for which I set an upper limit emissions cap. I use the attribute "COM_BNDNET" to do this. Please see the file attachment. uploads/29/Scen_CO2_Cap.zip
Are you saying that I should (in this file or another) define a lower limit on "COM_BNDNET" for each of the sectoral emissions, thereby over-writing the default TIMES assumption that their lower limit is zero? In an earlier post, you mentioned the attribute "VAR_COMNET", but I think this is a VEDA-BE variable, and not a VEDA-FE variable, correct? If I am right in this way of thinking, then should I just specify the limit to be ridiculously low, so that it never binds (e.g., -1,000,000,000 ktons)?