Veda2.0 Released!


Sector specific zero emissions
#1
Dear all,

I am want to set the Iron and Steel (IIS) sector of my model carbon neutral, which means this sector can rely on negative emissions generated by the sector itself. The problem is, I didn't think of disaggregating the emissions due to the IIS sector in the first place, so they are now aggregated into the commodity representing the industrial CO2 emissions (INDCO2N and INDCO2P), including those from cement, alumina, etc.
I a first attempt, I tried to set the attached UC which instructs every process of the IIS sector to emit zero CO2. But it's not what I want. What I want is that the emissions of the whole sector equal zero, so some emissions of certain processes can be offset by others.
My question is: are there some tricks in the declaration of UCs to instruct to model that the overall CO2 emitted by a specific sector equals 0 - but not necessarily for every single process of the sector?

If not, I'm afraid I will need to disaggregate the emissions of the IIS sector, unless you guys have a better idea.

Thanks,

Lucas


Attached Files Thumbnail(s)
   
Reply
#2
In TIMES models, one can build almost any kinds of linear constraints with user constraints, involving any combination of the standard model variables (VAR_ACT, VAR_FLO, VAR_IRE, VAR_NCAP, VAR_CAP, VAR_COMPRD, VAR_COMNET, VAR_CUMFLO, VAR_CUMCOM), over any user-defined set of processes and/or commodities.

GHG emissions are in TIMES models usually represented by process flow variables  VAR_FLO(r,v,t,p,c,s), where p is a process and c is an emission commodity.  In general, such emission flows can be either output flows or input flows, where an output flow would normally represent positive emissions and input flows negative emissions.  However, emission flows defined by FLO_EMIS may also have negative levels, in which case a negative output flow would represent negative emissions and a negative input flow would represent positive emissions.

Insofar as the sectoral emissions are represented by such process flows, within a known set of processes, they can be easily aggregated together and a bound can then be defined on the total (net) sectoral emissions.  In the aggregation, one should of course remember that input flows should be given a negative sign when aggregating the flows together. So we would get the following expression:

  SecEm(r,t) = SUM((v,p,c,s), ar,t,p,c × VAR_FLO(r,v,t,p,c,s))

It is straightforward to define the right hand side expression shown above as the LHS expression of a user constraint, where the ar,t,p,c multipliers are defined by using UC_FLO. And then one can define period-specific upper bound(s) for the aggregated total net sectoral emissions by defining the RHS constant. No tricks are needed.

Of course, you could also add a new commodity to represent the sectoral emissions.  But then again, you would need to define the balance for that new emission commodity, basically in the same way as done in the expression above and as can be done in a user constraint.
Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
  Issue in Demand Modelling for a specific sector and its results namrata9815 2 332 16-07-2024, 01:04 PM
Last Post: namrata9815
  One question of EU-TIMES: CO2 emissions for gas/oil production/transmission process [email protected] 1 434 30-05-2024, 02:58 PM
Last Post: Antti-L
  Technology emissions (upstream emissions) Burcu U. 0 317 08-02-2024, 10:05 PM
Last Post: Burcu U.
  Setting lower bound on sectoral emissions UKTM User 14 4,035 15-09-2023, 02:40 PM
Last Post: UKTM User
  Unexpected emissions ejin 6 2,692 13-04-2023, 03:56 AM
Last Post: ejin
  Growth on CO2 emissions LucasD 1 910 21-11-2022, 06:06 PM
Last Post: Antti-L
  Negative emissions LucasD 2 1,130 10-11-2022, 06:38 PM
Last Post: LucasD
  Defining processes in specific regions [email protected] 2 2,665 02-09-2021, 08:26 PM
Last Post: [email protected]
  Grandfathering concept on CO2 emissions MikkelBosack 7 6,645 31-05-2021, 06:40 PM
Last Post: MikkelBosack
  Modeling upper bound for cummulative emissions qzaus 3 3,071 09-04-2021, 09:45 PM
Last Post: Antti-L

Forum Jump:


Users browsing this thread: 1 Guest(s)