Topic: Process EfficienciesSubscribe | Previous | Next
James Marett 1/15/2015
1268 Views Process Efficiencies are specified for each type of process. Where/How does LEAP use this input data? Is it used in any form to calculate emission and particulate levels? Or is it used (exclusively) in optimization calculations and alternatives considerations.
I see in early Discussion Forum where Charlie said LEAP decision was to NOT include default data values since each country, process, production plant, age of equipment and technology would be unique. Understand.
Have you run across industry or IPCC references for input fuel conversion efficiencies (e.g. IPCC AR4/WG3 Chap 4.4.3.1) in other forum discussions?
[The default method is to specify the percentage ratio of energy outputs to feedstock input fuel consumed by a Transformation conversion process. When entering efficiencies for processes, around 33% is typical for base-load steam generation.]
Taylor Binnington 1/16/2015
1267 Views Hi James,
A complete description of Process Efficiency (and related variables Heat Rate and Losses) is available here through LEAP's help system:
http://www.energycommunity.org/WebHelpPro/Transformation/Efficiency_Data.htm
The Process Efficiency variable is a very important part of LEAP, since it is used to calculate required inputs for a given unit of output. This can impact emissions (which may be specified either per unit of energy produced or consumed by the process), the dispatch of other Transformation modules lower in the tree, as well as analysis of total resource or trade requirements.
LEAP does not include any default power plant data from international sources. However, some good current sources of efficiency and cost data can be found in IPCC's AR5/WG3 Annex III, as well as IEA's Energy Technology Perspectives 2012. These data include many legacy plant types, as well as newer generation technologies.
Take care,
Taylor
James Marett 1/20/2015
1245 Views IEA's Energy Technology Perspectives 2012 is subscription.
IPCC's AR5/WG3 Annex III: Technology-specific Cost and Performance Parameters answers many/most of LEAP requirements.
http://www.ipcc.ch/pdf/assessment-report/ar5/wg3/ipcc_wg3_ar5_annex-iii.pdf
Taylor Binnington 1/20/2015
Ravita Prasad 5/18/2017
Hi Taylor
I read "http://www.energycommunity.org/WebHelpPro/Transformation/Efficiency_Data.htm" which says that process efficiency can be written 100% for hydro or renewable electricity generation. Why is this? Also how does LEAP calculate energy output from each process? For each of the processes in Electricity Generation module, I have entered exogenous capacity, historical production for base year, process efficiency and maximum availability.
Appreciate clarification on this?
Regards
Ravita
Taylor Binnington 5/18/2017
Hi Ravita,
So long as you are not using LEAP's optimization capabilities, then after the First Simulation Year, LEAP's transformation processes obey their process dispatch rules to meet the module's requirements in each time slice. This graphic might be useful to understand how processes may be dispatched to meet load.
Setting the Process Efficiency (simply the ratio of the energetic contents of the outputs to the energetic contents of the feedstock) equal to 100% is akin to saying that "we don't care how much input energy is consumed", even if it is not physically correct. This is sometimes the case for renewables, i.e. we are not concerned with a finite reserve of wind energy, since the resource is abundant.
Hope this helps,
Taylor
Ravita Prasad 5/18/2017
