Instructions (back)
- You can change values for on/off/standby modes and hours by using the dropdown menus or you can type any value — e.g. from the ENERGY STAR database— directly into the text boxes.
- Please do not use the comma sign (,) for decimals. It will not be recognised by the calculator.
- Explanations can be found when clicking on items.
- If you click on the 'Calculate!' button, the new output will be added to the Calculator History.
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Equipment
This calculator lists several printers, copiers and MFD's (Multi-Functional Devices, combining at least printer/copier/scanner; if a facsimile function is also included it is indicated as 'MFD + fax'). An MFD in the list is usually an inkjet-device unless indicated otherwise. These examples represent a choice for small, medium-sized and large workgroups, with speeds in the range of 6-10 pages per minute (ppm) for colour prints and up to 32 ppm for 'normal quality' black-and-white prints.
Draft quality is 50% faster, best quality is 50% slower with inkjet.
Resolution is in the range of 1200x1200 dpi or higher, unless indicated otherwise. Their robustness (indicated by what is known as 'Monthly Duty Cycle' ) covers the whole spectrum from 5000 (individual) to 100,000+ pages/month (large workgroups).
For 3 models a version is given with and without duplexing (double-sided printing or copying, saving 'paper energy').
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Default values
The calculator shows typical presets for purchase price (incl. VAT) or annual lease costs, paper (plain paper set at around 1.6 EuroCts/page) and ink/toner costs, electricity rate (default EU average of € 0.15/kWh) and a given annual production that is typical for the device. As a general rule the default annual number of pages given in the presets is about the same as the Monthly Duty Cycle indicated by the manufacturer. The default product-life of the device is 6 years.
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Energy use
The energy use for printing/copying ('on' mode) is calculated from the annual production, the speed (in ppm) and the operational energy use as indicated by the manufacturer.
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Power management
If power management is enabled, which is unfortunately not always the case especially with volume printers/copiers, the device goes into sleep mode when it is not printing. An 'off'mode consumption is not given here in this simplified calculator, but -depending on the model— various sleep/deep sleep/standby modes can exist especially for larger printers/copiers. Ask your vendor.
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Air-conditioning
When your room/office is cooled by air-conditioning, the heat load of the imaging equipment contributes to the electricity consumption of the air-conditioning installation.
Specify how many months per year the air-conditioning is used for artificial cooling (not heating).
The air-conditioning is assumed to function with an efficiency of 300% (COP is 3.0). Formula: Extra electric energy for air-conditioning = (energy use of equipment/3) * (Months/12).
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Especially for medium-sized and large workgroups there are many more options than could be listed here. Notably options for scan-to-file, scan-to-e-mail and scan-to-ftp could save valuable resources (paper/toner/energy) and rationalize archiving, storage, data-sharing, etc.. Please ask your vendor.
Calculator History
The last 6 scores of the Energy Calculator are kept in a separate table, where column '1' represents the actual score, '2' the previous score, etc.. If you click the header ('1', '2', '3', etc.) of a column, the calculator will show the input values that produced those results.
Keeping the score helps you to see if (and how) you are improving. A new score is added (and an old score is dropped) each time you click the 'Calculate!' button.
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