Transcript Chapter 4 Measurement Units and Conversion Factors

Chapter 4 – Measurement units
and conversion factors
Odd Andersen
Energy Statistics Section
Introduction
Review of main changes
Questions to the Oslo Group
Recent history (1)
A first draft was discussed at the 3rd OG
meeting. The conclusions:
– No measurement units recommended for data
collection but for dissemination;
– ‘yes’ to recommend the use of SI
– discussed the use of Net vs. Gross calorific values
– to move some text to the annex
– to consult with FAO on tables related to biomass
Recent history (2)
A revised draft discussed at the 1st Virtual meeting.
Among the conclusions:
– refer to ‘default’ instead of ‘standard’ calorific values
– update default calorific values. Possible use of IPCC values
– include a section on how to calculate average calorific
values
– introduce the concept of standard cubic metre for gasses
2nd Virtual meeting conclusion:
– Recommend the use of net calorific values
Main changes (1)
• “default calorific value” replace “standard calorific
value”
• a proper subsection on how to calculate average
calorific values
• more background on the International System of
Units
• Improved text on the explanation of density and
specific gravity
• Tidied up discussion of energy units (e.g. all energy
units now discussed in the same subsection)
Main changes (2)
• Cleared up discussion of the ‘calorie’
– International steam table (IT) calorie vs. gram
calorie
– ‘calories’ in IRES are referring to IT calories unless
otherwise specified
• joule equivalents explicitly given for all the
other units
Questions to the Oslo Group
The Oslo Group is invited to:
• Review the changes incorporated in the text. For
example:
– Section on the calculation of average calorific values
– Conversion factors referring to IT calories
• Advise on the use of IPCC values for default calorific
values
– If so, should values be provided for products not covered
in IPCC if available?
• Review the unit recommended for dissemination
• Provide any additional comments to the chapter
Thank you!