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High-temperature hot water (HTHW)
Y is Q times EF divided by 1000
Y is the scope 2 emissions measured in t.CO2-e
Q is the quantity of electricity (kWh)
EF is the scope 2 emission factor for Victoria (kg.CO2-e/kWh)
National Greenhouse Accounts (NGA) Factors conversion factors – Table 5
Department of Environment and Energy
Natural gas consumption amounts supplied to the thermal cogeneration plant as provided by the plant operator – expressed in gigajoules (GJ).
HTHW consumed at EPA facility – expressed in gigajoules (GJ)
The preferred methodology is the efficiency method as described by the GHG Protocol guidance - Allocation of GHG Emissions from a Combined Heat and Power (CHP) Plant. Due to inadequate onsite metering, there is a lack of data that meant application of the efficiency method was not possible. The following method was developed in collaboration with the plant operator:
Y is Q times EC times EF divided by 1000
Q is the quantity of HTHW consumed by EPA’s Centre for Environmental Studies (CES) facility (GJ)
EC is the energy content factor for natural gas (GJ/kL)
EF is the full cycle emission factor natural gas (kg.CO2-e/GJ).
Q is P times (Nlt times Phthw plus Nlt times Ploss times Hfrac)
P is the proportion of HTHW consumed by EPA’s CES facility (%)
Nlt is the quantity of natural gas consumed by the co-generation plant at La Trobe University.
Phthw is the proportion of natural gas attributed to HTHW generation
Ploss is the proportion of natural gas attributed to system loses and auxiliary services
Hfrac is the fraction of system loses and auxiliary services attributed to HTHW
P is PCES divided by (Nlt times Phthw)
PCES is the quantity of HTHW consumed by EPA’s CES facility
The following were based on an energy audit of the cogeneration plant conducted by Sinclair Knight Merz (SKM):
Page last updated on 24 Aug 2017