LNG CI = NG to LNG + NG to CNG?

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2 weeks 6 days ago #163 by clarice.vassallo
LNG CI = NG to LNG + NG to CNG? was created by clarice.vassallo
Hello,

I am calculating the carbon intensity of the LNG using version 4.03 of the GHGenius. The facility uses the natural gas from the grid to liquefaction. When running the program, should I sum the results from column Q (NG to LNG) and R (NG to CNG) to ensure that the production of the CNG from extraction to compression and transmission are included in the final CI?
If so, could you confirm if all rows from Q and R9 to Q to R20 should be summed up without the risk of double-counting? For example, the final results for the LNG CI (without exhaust combustion) of the results attached is 21,523 gCO2e/ GJ (11,531 gCO2e/GJ + 9,992gCO2e/GJ)?

Thank you for your time,
Kind regards,
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2 weeks 5 days ago #164 by doconnor
Replied by doconnor on topic LNG CI = NG to LNG + NG to CNG?
Clarice

There is no need to add the columns. The LNG column is all that you need. The LNG energy requirements are entered on the Service Station sheet.

Regards
Don O'Connor

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2 weeks 4 days ago #165 by clarice.vassallo
Replied by clarice.vassallo on topic LNG CI = NG to LNG + NG to CNG?
Thank you for clarifying that.
I am getting very low results for the LNG CI. When I run the default values for BC version 4.03a, I get 14.58 gCO2e/MJ (11.71 gCO2e/MJ +2.87 gCO2e/MJ from exhaust emissions).
When comparing this to approved carbon intensities and secondary sources, I would expect a default CI to be ranging around 65 to 75 gCO2e/MJ. Also, the combustion of LNG looks to be higher than 2.87 gCO2e/MJ, most likely something about 50 gCO2e/MJ. Moreover, looking at the exhaust emissions tab, the cell AF142 looks more likely (50 gCO2e/MJ) than the Net CO2+non CO2 2.87 gCO2e/MJ in AF143.
Could you help me understand if I am missing something? And why the fuel use is so low?

Thanks for your time,
kind regards

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2 weeks 3 days ago #166 by doconnor
Replied by doconnor on topic LNG CI = NG to LNG + NG to CNG?
Clarice

Row 142 is used for fossil fuels and row 143 is used for biogenic fuels.

Regards
Don O'Connor
The following user(s) said Thank You: clarice.vassallo

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2 weeks 2 days ago #167 by clarice.vassallo
Replied by clarice.vassallo on topic LNG CI = NG to LNG + NG to CNG?
Thank you, that clarifies.
I have one more question. Could you clarify what does the refuelling site in version 4.03 refers to? In this version, I have the option to enter the number of transfers for "small scale, refuelling site" and "large scale central site". My understanding is that:
- Central site is the LNG facility. # of transfers = 2 (storage tank to the truck and truck to the dispensing station)
- Refuelling station is the dispensing station. # of transfers = 1 (end-use)

Is this correct?

Thanks,
best regards,
have a nice weekend,

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2 weeks 2 days ago #169 by doconnor
Replied by doconnor on topic LNG CI = NG to LNG + NG to CNG?
Clarice

The small scale pathway would be for a LNG system at the refueling site, so there would be one transfer.

The central system would have three transfers, LNG site to truck, truck to storage at refueling and then the storage tank to a vehicle.

Regards
Don O'Connor

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1 week 4 days ago #174 by clarice.vassallo
Replied by clarice.vassallo on topic LNG CI = NG to LNG + NG to CNG?
Thank you!

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