Choice of method

There are two methodological tiers for determining emissions and storage from paraffin waxes. Both Tier 1 and Tier 2 rely on essentially the same analytical approach, which is to apply emission factors to activity data on the amount of paraffin waxes consumed in a country (in energy units, e.g., TJ). The Tier 2 method relies on determining the actual use of paraffin waxes and applying a country-specific ODU factor to activity data, while the Tier 1 method relies on applying default emission factors to activity data (see decision tree, Figure 5.3).

Tierl: CO2 emissions are calculated according to Equation 5.4 with aggregated default data for the limited parameters available:

Equation 5.4 Waxes - Tier 1 method

Where:

CO2 Emissions = CO2 emissions from waxes, tonne CO2 PW = total wax consumption, TJ

CCWax = carbon content of paraffin wax (default), tonne C/TJ (= kg C/GJ)

ODUWax = ODU factor for paraffin wax, fraction

44/12 = mass ratio of CO2/C

Tier 2: The Tier 2 method for paraffin waxes relies on a similar equation, however detailed data on the quantities (possibly also on the types) of paraffin waxes produced (in energy units) and their respective use as well as country-specific emission factors should be used:

Equation 5.5 Waxes - Tier 2 method

Where:

CO2 Emissions = CO2 emissions from waxes, tonne CO2 PW! = consumption of was type i, TJ CQ = carbon content of wax type i, tonne C/TJ (= kg C/GJ) ODUi = ODU factor for wax type i, fraction 44/12 = mass ratio of CO2/C

Figure 5.3 Decision tree for CO2 from non-energy uses of paraffin waxes

Figure 5.3 Decision tree for CO2 from non-energy uses of paraffin waxes

Note:

1. See Volume 1 Chapter 4, Methodological Choice and Identification of Key Categories (noting Section 4.1.2 on limited resources), for discussion of key categories and use of decision trees.

Note:

1. See Volume 1 Chapter 4, Methodological Choice and Identification of Key Categories (noting Section 4.1.2 on limited resources), for discussion of key categories and use of decision trees.

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