Sarada Ramaswamy 7/1/2011

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Hi


I have the following queries

1) In Coal Mining- Transformation

What do you mean by process efficiency/ capacity of coal mining process?( can you define what you mean by the process efficiency/ exogenous capacity of open cast mining process?). Somehow the definition of these variables does not fit for coal mining as no transformation happens here.

2) In Oil Refining - Transformation

In Historical production, should we enter the historical production of crude oil? Does it not make more sense to enter the production value of output fuels ( total of petroleum, kerosene etc), as crude oil is a feed stock fuel?


Thanks in advance

Sarada

Tory Clark 7/1/2011
 

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Hi Sarada,

1) Efficiency for a transformation module like coal mining would represent the energy efficiency of all processes related to coal mining, including coal washing.

2) Just like for an electricity generation module you would enter a historical production in kWh of electricity produced, it makes sense to enter historical production for oil refining as the tonnes of oil equivalent of output fuels.

Best,

Tory

Sarada Ramaswamy 7/2/2011
 

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Dear Tory


Thank you for your reply

1) Coal mining efficiency/ capacity: I understand your point. But my confusion is what is meant by the capacity of, say, an open cast coal mine? ( If it is electricity generated through wind, I am able to garner data on its efficiency and capacity easily)


2) Where do I show coal washery rejects? ( under coal mining process? )

I have one more query

3) In electricity generation ( transformation),

If,
Thermal power generated = 150 MTOE
Conversion loss = 80 MTOE
Auxiliary consumption = 10 MTOE
T & D loss = 15 MTOE
------
Net availability = 45 MTOE

Please explain what value should be written in historical production and where does conversion loss get accounted?


Thanks

Sarada

Tory Clark 7/5/2011
 

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Hi Sarada,

1) For coal mining, exogenous capacity can be defined either as the maximum production of coal or feedstock of coal that can be mined in a given year. What you actually produce in a given year may be less than the capacity due to the availability of the process.

The process efficiency is technically defined as the energy content of the output fuels divided by the energy content of the feedstock fuels. This efficiency should take into account any conversion losses from the mining and washing processes. I suggest talking with a specific mining operation to get quality assumptions for this.

2) LEAP currently only tracks energy usage, so any coal or water waste from the process will not be included in a LEAP analysis.

3) Remember that there are 2 modes of calculation for any capacity-based transformation module: historical and simulation, and the mode is chosen by specifying a "First Simulation Year" in current accounts.

Historical: In all years before the first simulation year, LEAP simply uses the generation from the "Historical Production" variable. In this case, you should enter the net generation (after conversion losses and auxiliary consumption) output of the power plant. Do not include T&D losses because you should have a separate module fot those losses.

Simulation: In the first simulation year and afterwards, the historical generation variable is no longer used. Instead, you must use the Capacity, Capacity Credit, Availability, and Efficiency variables to define output in any given year. In your example, the conversion loss and auxiliary consumption should be factored into your overall thermal efficiency. Just as with the historical mode, T&D loses should be included in a separate module.

Best,

Tory