Ship modelling for energy island

[frangb99]

Hello everyone, sorry for disturbing again but i have a question as general modelling of an activity in my model that i would like to think how would you approach it. 
I am modelling an energy island, and i am having troubles on how to model the ship transport of e-fuels from the island to land. In particular i gave the model the option to use ships to trnasport hydrogen, ammonia, methanol and jetfuel, to the countries of Denmark, norway, netherlands, germany, norway, uk and belgium. 
My approach of modelling this is basically creating the ship transport process as it is shown in the next image ( this example is for jetfuel to denmark), here the process takes kerosense and comes out with kerosen to export, with a certain cost ( in this case i believe that there is no need for investment in the ship, i think it could be better to approach it as a payment in variable cost on the amount of fuel you want to transport in MEUR/PJ but maybe i am wrong).
   

Then the commodity EXP_KRE_DK, which is the one that is exported is given a "profile" of export price everyhour, i am giving the same price every hour of the year as you can see in this image:
   

When it comes the difficult part is when i am trying to give a profile for the NCAP_AF of the ship process, where basically the NCAP_AF is 1 during the charging part and 0 when is out the port of the island as you can see here:  
   
every ship have a different profile ( depending on the country is going and also the e-fuel we are sending). I know that this approach is not how a ship wpuld work, but is the only one I have been able to come up with for hourly timeslice. I was wondering if someone could have an idea of how to do it better, specially the fact that i want a full ship completly loaded before being sent to land, but this is not what is happening right now, as it can be seen in the results i am getting: 
   
where the activity is 0.48 PJ FOR THE HOLE YEAR when a ship of this characteristics is 1.9 PJ. 
Any idea on how to model this on VEDA?

[Antti-L]

I am not quite able to follow your modeling problem, but to me the final sentences would seem to suggest that maybe you would like to see the activity for the whole year being 1.9 PJ, instead of 0.48 PJ, because you say that the "ship of this characteristics is 1.9 PJ"?  If so, would you consider accomplishing that by multiplying your NCAP_AF values by 1.9 / 0.48 ?

[frangb99]

I am not quite able to follow your modeling problem, but to me the final sentences would seem to suggest that maybe you would like to see the activity for the whole year being 1.9 PJ, instead of 0.48 PJ, because you say that the "ship of this characteristics is 1.9 PJ"?  If so, would you consider accomplishing that by multiplying your NCAP_AF values by 1.9 / 0.48 ?

more than that i want 1.9 in total in 1 year. I mean that that a normal ship is 1.9 PJ, and a ship to leave the island should be full, but i am creating this profile for filling the ship that it is just available certain hours ( when should be being filled). The problem is basically that with that profile, the ship is "leaving the port" basically almost empty, and every time it comes and leaves it is only being filled with little amount of kerosene. The 0.48 is like the total sum of all the kerosen exported in one year. 
I really can not come up with any idea to solve this problem

[frangb99]

I am not quite able to follow your modeling problem, but to me the final sentences would seem to suggest that maybe you would like to see the activity for the whole year being 1.9 PJ, instead of 0.48 PJ, because you say that the "ship of this characteristics is 1.9 PJ"?  If so, would you consider accomplishing that by multiplying your NCAP_AF values by 1.9 / 0.48 ?

I do not know if my second explanation is a bit more clear

[Antti-L]

Sorry, no it is not clear to me.

> I really can not come up with any idea to solve this problem

Could you please try and describe what the problem is? 

I think your NCAP_FOM figures are quite consistent with the capacity unit being PJ/a (as indicated in your screenshots), and so is your PRC_CAPACT, and with that capacity unit you can deliver annually at most 1 PJ per unit of capacity.  Therefore, the maximum nominal annual VAR_ACT level would be equal to the VAR_CAP level. Your results were much lower, but that is because of your NCAP_AF profile, leading to an annual utilization factor of about 24% (I could not see all values).  So, I suggested to scale up the NCAP_AF values to reach an utilization factor close to 100%. But it seems you did not consider that solving anything?  So, I don't know whether your problem is related to the activity level at all.

[frangb99]

Sorry, no it is not clear to me.

> I really can not come up with any idea to solve this problem

Could you please try and describe what the problem is? 

I think your NCAP_FOM figures are quite consistent with the capacity unit being PJ/a (as indicated in your screenshots), and so is your PRC_CAPACT, and with that capacity unit you can deliver annually at most 1 PJ per unit of capacity.  Therefore, the maximum nominal annual VAR_ACT level would be equal to the VAR_CAP level. Your results were much lower, but that is because of your NCAP_AF profile, leading to an annual utilization factor of about 24% (I could not see all values).  So, I suggested to scale up the NCAP_AF values to reach an utilization factor close to 100%. But it seems you did consider that solving anything?  So, I don't know whether your problem is related to the activity level at all.

I am thinking maybe on the NCAP_AF instead of the profile i have now, having just 2 moments where the capacity is available, like the ship is just available 2 times per year. Also, i do not get why scaling the NCAP_AF  is good idea, like, is not the maximum NCAP_AF 1 ?? is like with the wind farms, the ncap_af is always bellow 1