HP Web Jetadmin - Eco Solutions for HP Web Jetadmin
APPENDIX A
Carbon Footprint Calculator: Key Assumptions
ASSUMPTIONS
The following are key assumptions used by the HP EcoSMART Fleet application.
1. The EcoSMART Fleet application generates estimates of energy consumption during use of a
printer, emissions of carbon dioxide from production of that electricity, and carbon dioxide
emissions from production of estimated volumes of paper consumed during printing (i.e.
estimated CO2 from electricity production and CO2 from paper production). The EcoSMART
Fleet application also estimates the user’s costs for the electricity and paper a printer
consumes. It is based on certain key assumptions and makes use of data and models
generated by third parties described below.
2. The carbon dioxide equivalent (CO2-e) results are for a 100 year global warming potential
(GWP) horizon if default emission factors are employed by the user.
3. The energy consumption calculation is based on the calculations used in the ENERGY STAR
Qualified Imaging Equipment Typical Electricity Consumption (TEC) test procedure,
documented here: http://www.eu-
energystar.org/downloads/specifications/200601/FinalTECTestProcedure.pdf. More
specifically, the application utilizes the job table to estimate the number of jobs printed per
day, given the number of pages printed. It assumes a usage pattern as described in the TEC
procedure, where jobs are divided evenly between morning and afternoon periods. The
usage pattern is based on a 5-day work week with no activity on the weekend, and 8-hour
work days with a 1-hour lunch period of no activity. Furthermore, it calculates the time spent
in different power usage modes, given the number of jobs per day, print speed of the device,
and time to go into sleep mode.
4. The published power rates for active, idle, and Powersave or sleep mode are used for
devices when those rates are known and can be matched to the device model by EcoSMART
Fleet. These are considered “known” devices. All other devices are considered “unknown”
devices, which use power rates and speeds equivalent to the average of all known device
power rates and speeds, when calculating energy consumption.
5. The electricity carbon dioxide equivalent (CO2-e) factors used in the calculations comes from
the following sources:
Region
Note
All
regions
unless
otherwise
noted
below
2008 CO2 Emissions per kWh from Electricity and Heat Generation. Source: CO2
Emissions from Fuel Combustion – Highlights. 2010 Edition. International Energy
Agency. Available at http://www.iea.org/co2highlights/CO2highlights.pdf
Australia
2007 Full fuel cycle emissions factor. Source: National Greenhouse Accounts (NGA)
Factors, January 2008, Commonwealth of Australia, Department of Climate Change.
Available at http://www.climatechange.gov.au/workbook/pubs/workbook-
feb2008.pdf
Overall Australian CO2 emissions factor a population weighted average.
Canada
Source: Greenhouse Gas Division, Environment Canada, National Inventory Report,
Greenhouse Gas Sources and Sinks in Canada - 1990-2005. (Submission to the