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RE: [EnergyPlus_Support] Environmental Impact Factors & Fuel Factors
I went back and double checked all my work and made the difference between the two runs was was even larger to make sure just running the similation for the two design days was enough to detect a difference in their emissions. There still is no difference betwee the output values.
The three input objects for the low simulation are
ENVIRONMENTAL IMPACT FACTORS,
0.3, !- Purchased Heating Efficiency
3.4, !- Purchased cooling COP
0.25, !- Steam Conversion Efficiency
80.7272, !- Total Carbon Equivalent Emission factor from NOx
6.2727, !- Total Carbon Equivalent Emission factor from CH4
0.2727; !- Total Carbon Equivalent Emission factor from CO2
Fuel Factors,
Electricity, !- Name of existing resource
kg, !- Measure units (kg or m3)
, !- J per measure unit factor
1, !- Source energy factor (J/J)
Const Emissions, !- Source energy schedule FanAvailSched
159.26132, !- CO2 emission factor (g/MJ)
, !- CO2 emission factor schedule
1.85885E3, !- CO emission factor (g/MJ)
, !- CO emission factor schedule
1.34818E-3, !- CH4 emission factor (g/MJ)
, !- CH4 emission factor schedule
3.29232E-1, !- NOx emission factor (g/MJ)
, !- NOx emission factor schedule
2.55776E-3, !- N2O emission factor (g/MJ)
, !- N2O emission factor schedule
1.25834, !- SO2 emission factor (g/MJ)
, !- SO2 emission factor schedule
2.21604E-2, !- PM emission factor (g/MJ)
, !- PM emission factor schedule
2.20060E-2, !- PM10 emission factor (g/MJ)
, !- PM10 emission factor schedule
1.54356E-4, !- PM2.5 emission factor (g/MJ)
, !- PM2.5 emission factor schedule
1.47657E-4, !- NH3 emission factor (g/MJ)
, !- NH3 emission factor schedule
1.51542E-3, !- NMVOC emission factor (g/MJ)
, !- NMVOC emission factor schedule
6.56449E-6, !- Hg emission factor (g/MJ)
, !- Hg emission factor schedule
0, !- Pb emission factor (g/MJ)
, !- Pb emission factor schedule
0, !- Water emission factor (L/MJ)
, !- Water emission factor schedule
0, !- Nuclear High Level emission factor (g/MJ)
, !- Nuclear High Level emission factor schedule
0, !- Nuclear Low Level emission factor (g/MJ)
; !- Nuclear Low Level emission factor schedule
Fuel Factors,
Natural Gas, !- Name of existing resource
kg, !- Measure units (kg or m3)
, !- J per measure unit factor
1, !- Source energy factor (J/J)
Const Emissions, !- Source energy schedule
50.23439, !- CO2 emission factor (g/MJ)
, !- CO2 emission factor schedule
3.51641E-2, !- CO emission factor (g/MJ)
, !- CO emission factor schedule
9.62826E-4, !- CH4 emission factor (g/MJ)
, !- CH4 emission factor schedule
4.1862E-2, !- NOx emission factor (g/MJ)
, !- NOx emission factor schedule
9.20964E-4, !- N2O emission factor (g/MJ)
, !- N2O emission factor schedule
2.51172E-4, !- SO2 emission factor (g/MJ)
, !- SO2 emission factor schedule
3.18151E-3, !- PM emission factor (g/MJ)
, !- PM emission factor schedule
2.38613E-3, !- PM10 emission factor (g/MJ)
, !- PM10 emission factor schedule
7.95378E-4, !- PM2.5 emission factor (g/MJ)
, !- PM2.5 emission factor schedule
0, !- NH3 emission factor (g/MJ)
, !- NH3 emission factor schedule
2.30241E-3, !- NMVOC emission factor (g/MJ)
, !- NMVOC emission factor schedule
1.08841E-7, !- Hg emission factor (g/MJ)
, !- Hg emission factor schedule
2.09310E-7, !- Pb emission factor (g/MJ)
, !- Pb emission factor schedule
2.1007, !- Water emission factor (L/MJ)
, !- Water emission factor schedule
0, !- Nuclear High Level emission factor (g/MJ)
, !- Nuclear High Level emission factor schedule
0, !- Nuclear Low Level emission factor (g/MJ)
; !- Nuclear Low Level emission factor schedule
REPORT ENVIRONMENTAL IMPACT FACTORS,
monthly; !- Reborting Frequency
SCHEDULE:COMPACT,
Const Emissions, !- Name
Fraction, !- ScheduleType
Through: 12/31,
For: AllDays,
Until: 24:00, 1.0;
And for the high the only change is
100, !- Source energy factor (J/J)
for the electricity fuel factor.
Just to make sure it wasnt my file, I copy and pasted these three objects into the "CompactHVAC-5ZoneFanCoil.idf" to see if I could detect a difference and still was not able to detect one.
I will be happy to upload my files if you would like to look them over.
Thanks,
Joe Lewis
Fortier Engineering
"Griffith, Brent" <brent_griffith@xxxxxxxx> wrote:
Changing (lowering) the source energy factor in a Fuel Factors object is
the right thing to do. It should be working. Check that you have all
three objects in your input file: "Report Environmental Impact
Factors", "Environmental Impact Factors" and "Fuel Factors"
I think the source data that ships with EnergyPlus is EPA egrid data for
1999. There are newer emissions factors in this report:
http://www.nrel.gov/docs/fy07osti/38617.pdf
________________________________
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of
fortierengineering
Sent: Friday, August 24, 2007 1:45 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Environmental Impact Factors & Fuel
Factors
I have modeled a building in Pennsylvania and to start I have used the
electricity and natural gas fuel factors found in the data sets as well
as the Environmental Impact Factors to determine the emissions
contributions from this building.
When I spoke with the local electricity company they advised me that
the transmission losses for this location were lower than the state
average. They did not have information reguarding the exact g/J of
emission break down.
I cannot figure out what field controls the electricity transmission
losses.
I thought it was the "J per measured unit factor" or the "source energy
factor", but changing either of these fields does not affect any of the
emission factors (ran the simulation at 1.827, then 1, then 10 and the
emission totals turned out exactly the same).
What are these two fields used for if they have no effect on the final
data, and what is the best way to express a reduction in transmission
losses?
Thank you,
Joseph Lewis
Fortier Engineering
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