Discussion: LEAP
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Christer Sko
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Subject: Multiple fuel for a technology Posted: 6/12/2008 Viewed: 1568 times | Hi, I have some problems modelling plug-in hybrids under the transport sector. I see from the update list that in the 2008 version it is possible to: "add multiple fuel devices in Transport Stock-Turnover Calculations, and vehicles with multiple feedstock fuels (for examples, ethanol and gasoline)" Although I can not figure out how to make a car consume both electricity and gasoline. Is it possible or do I have to add a new fuel consisting of both electricity and gasoline? thank you! Christer Skotland |
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Veena Subramanyam
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Subject: Multiple fuel for a technology Posted: 6/12/2008 Viewed: 1557 times | Hi, I am also trying to add new fuel in the existing list which is Natural gas Liquid ,consisting of ethane,propane and butane.Is it possible in 2008 version to make a new fuel matching with properties of all these?? Ps let me know if anyone has created a new fuel by blending two fuel properties. Thanks Veena |
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Charles Heaps
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Subject: RE:Multiple fuel for a technology Posted: 6/13/2008 Viewed: 1539 times | > I have some problems modelling plug-in hybrids under the transport sector...I cannot figure out how to make a car consume both electricity and gasoline. Is it possible or do I have to add a new fuel consisting of both electricity and gasoline? Hi Christer, Yes this is possible. First you have to be using the Transport stock turnover methodology. Make sure your demand branch poperties are set so that the technologies are marked as small car tire icons. When you first create one of these trasport technologies you pick a fuel to associate with that technology (e.g. gasoline/petrol). Note that in LEAP, electricity is also considered a fuel. Once the technology is created, you wil see the fuel listed under the technology branch (shown as a yellow sun icon). You can add the emissions factors for that fuel below that. You can then add additional fuels next to the first fuel. Click on the fuel, then press the green [Add] button. You can add electricity here if you are modeling a plug-in hybrid. [SIDE NOTE...This may be stating the obvious, but note that for non-plug in hybrids you should not specify an extra electricity branch, since all the electricity used by the car is generated internally, so LEAP does not need to know about it. As far as LEAP is concerned, a regular hybrid (e.g. the current Prius) is just a more efficient car]. The tricky part is that you will have to specify the share of the devices using each fuel. This is roughly equivalent to the share of energy provided by the gasoline vs. electricity. So you will have to figure out what fraction of the energy used in plug-ins comes from gas vs electricity. This obviously will depend enormously on how such vehicles are driven, since if used primarily for commuting the electric share might be quite large. I hope this helps! Best, Charlie |
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Charles Heaps
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Subject: RE:Multiple fuel for a technology Posted: 6/13/2008 Viewed: 1538 times | > I am also trying to add new fuel in the existing list which is Natural gas Liquid ,consisting of ethane,propane and butane.Is it possible in 2008 version to make a new fuel matching with properties of all these?? Yes: go to the General: Fuels menu option. This shows the list of fuels currently defined in your area. You can add additional fuels to this list by pressing the Green [Add] button. The easiest way to do this is usually to make a new fuel as a copy of a roughly similar existing fuel. You can easily find the main chemical characteristics of fuels by Googing there names on the Internet. The most important charateristics are energy content [GJ/Tonne] and density [kg/liter]. I hope this helps! Charlie |
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Veena Subramanyam
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Subject: RE:Multiple fuel for a technology Posted: 6/16/2008 Viewed: 1516 times | Thanks Charlie, But I was wondering if we can make a new fuel as Blend of two fuels rather than similar to only one existing fuel. Thanks Veena |
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Charles Heaps
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Subject: RE: Multiple fuel for a technology Posted: 6/16/2008 Viewed: 1513 times | > Thanks Charlie, > But I was wondering if we can make a new fuel as Blend of two fuels rather than similar to only one existing fuel. Hi again, Sorry my last answer was not clear. There is no direct option for calculating the characteristics of blended fuels in LEAP. You can either do an offline calculation and then enter the chracteristics of the blended fuel into LEAP (in the General: Fuels screen) or, if you think the blending fraction might change over time (e.g. increasing ethanol use in a gasoline/ethanol blend), then you may prefer to keep the two fuels separate and have the device modeled as using two separate fuels (in the Demand Technology branches). In this case you will need to put in seprate emission factors for each fuel. An advantage of this latter approach is that the fuel blend can change over time and change independently of the actual vehicle stock turnover calculations. Charlie |
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