1. Ive read here in the forum that if I dont have scrap and sales data, I shouldnt use the Stock Turnover Method and instead use the Technology with Intensity option. My question is how do I incorporate Fuel Economy (km/L), Annual Mileage (km) and Occupancy Rate (persons/vehicle) in this technology option?

2. Can I input my own forecast for vehicle population or should I just use Interp(EndYear,EndValue) under Activity Level>Expression? I have a value for each year until the end year.

3. Under activity level, my units always show as thousand vehicle per vehicle. I wish to remove the per vehicle as Im inputting the vehicle population. How do I do this? Do I edit the Units or is there a way to remove the per column? See picture below.

Thanks!

Thanks for your questions. Here are the answers:

1. Read through Training Exercise 2.2 which shows how to use the Activity Analysis method for calculating transport demands.

2. You can enter the data year-by-year using the Interp function (i.e. Interp(Year 1, Value 1, Year 2, Value 2,..., Year n, Value n)). You can also use the Data function by switching the word Interp with Data.

3. Instead of entering the number of vehicles in the Car, Gasoline and Diesel branches, enter the % shares. To do this, change the units to Share, and then enter the shares in Current Accounts and subsequent scenarios. For example, for the Gasoline and Diesel branches, the shares in the base year would be 98.5% (778,844/790,883*100) and 1.5% (12,039/790,883*100), respectively. In the reference scenario, the expressions would become:

Make a similar change to the Car branch.

Hope this helps,
Emily

1. Should the fuel economy correction factor and mileage correction factor be set to 1 if I'm using constant fuel economy for the demand forecast?

2. How does the Device Share tab work? So for example there are 60% gasoline cars and 40% diesel cars in my base year, will that remain constant for the next forecast years? Or the time series expression should be used if I have my own forecast of the number of vehicles (if this is the case, can you give me the link on how to format my excel file in order to be read properly by LEAP)? Or can the data function be used for this?

3. Considering question no. 2, what is the implication of setting stock share=0 and sales share=0?

4. Is it advisable to enter data starting from the devices upwards or the opposite?

Thank you.

1. The fuel economy and mileage correction factors are typically set to 1, unless you have the data to support their use. The fuel economy correction factor accounts for the difference between the "rated" fuel economy (inputted in the fuel economy variable) and the "actual" on-road fuel economy. The mileage correction factor is used to analyze rebound effects from the implementation of certain transport sector policies.

2. The Device Share tab is used to specify the share of fuels for a given vehicle. For example, this would be used if say diesel vehicles used either biodiesel and diesel, then you would specify the fuel share in the Device Share tab. If you are interested in specifying the share of gasoline and diesel cars, this goes into the Stock Share and Sales Share tabs. Stock Shares represents the share of existing vehicles (i.e. registered vehicles before the Base Year) and Sales Share represents the share of new vehicles bought after the Base Year. You can enter a forecast of the number of vehicles in the Stock and Sales tabs using the Data function, or the ReadFromExcel function if you have excel data.

3. If the Stock Share and Sales Share are set to 0, the number of vehicles in the model will be 0, so you won't have any transport energy demands being modeled! (Although, I think you may get an error first, because all shares must add up to 100%). I recommend that you read through the transport analysis calculations to get a better understanding of how the stock turnover method works in LEAP:

4. I think it might be a matter of preference, but I usually start from the top branch and work down to the device branches. I often end up rearranging the branch structure as I enter data, so I find it useful to do it this way.

Hope this helps,

Emily

That was a lot of help.

I'm using Device Share to input biofuel blending for gasoline. I can't seem to find bioethanol for gasoline and biodiesel for gas. Are they perhaps named differently in LEAP or is bioethanol interchangeable with ethanol? How about biodiesel?

Also, regarding stock share and sales share, the percentage here should be for the year before the base year right? If I enter a forecast for stocks and sales, will it automatically be translated to the stock share and sales share or should I also enter the shares calculated per year?

So sorry for the delay in responding.

As you may have noticed, LEAP's fuels database may not have all of the fuels that are in your analysis. You can always add a new fuel to the database by going into General:Fuels, and using the green plus (+) button to add a fuel. When adding a fuel, you can inherit the properties of another fuel (for instance, diesel for biodiesel), and then change specific characteristics, like energy content, density, etc. afterwards.

As for the stock and sales share (or any variable in LEAP really), unless you specify a year, such as through the Data() or Interp() functions, the value you enter in the expression applies for all years in the analysis. If you do specify the year, it applies for that year and onwards.

Generally, if a variable requires an expression, you would need to enter something in it. So you can't really leave the Stock, Sales, Stock Share and Sales Share variables blank or 0, unless it is intentional. Also, note that at any given branch you are entering either the Stock and Sales or the Stock Share and Sales Share, not both.

Hope this helps!

Emily