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The saving

Saving on energy consumption in computing revolves around the consumption of the computer itself, but also the associated monitor, printers, and USB peripherals. ESSaver measures and manages the energy consumption of all these components.

The measurement data is converted using a mathematical model to consumption. This method allows ESSaver to measure and log energy usage (ie power consumption in watts) to measure and log without using expensive hardware, such as energy meters, plugs, voltmeters, etc.

The method previously described in a patent which has been issued on December 7, 2009 (will be provided in 2011). We are 'patent pending '

Click here for the patent text

Overview usage by computer type

(data are the results of tests of computer equipment at several companies)

.	Average energy use(Watt)	Average use by dag (kWh)*	Yearlu use at 220 workable days (kWh)	€ (0,20 €/kWh)	CO2 producton jearly****	Potential saving 15% (€ / CO2)
Older laptop	106,37**	0,85 kwh	187,2 kWh	37,4	82,34 kg	5,61 / 12,35
Modern laptop	96,8**	0,74 kwh	170,00 kWh	34,07	74,8 kg	511 / 11,22
High end (game) PC	128,99 + 61*** = 220 Watt	1,28 kwh	281,6 kWh	56,32	123,9	8,45 / 18,59
Powerfull laptop	107,65	0,86 kwh	189,46 kWh	37,89	83,36	5,68 / 12,50
Modern Desktop	143,72 *****	1,15 kwh	253,0 kWh	50,6	111,32	16,7 /16,69

*	Average work computer is on 8 hours a day (work+lunch) (see conclusions 5 and 6)
**	50% of all laptop users use an external monitor. Depending on size this adds 60 Watt to the energy usage. The values in the table are increased for laptops by 30.1 Watt. Furthermore 30 Watts are added for: battery charging losses, storage start and stop peeks. pieken, USB devices such as USB hd’s, HUB’s, keyboards, etc.
*******	The energy usage of a Lenovo Tower PC was measured without the monitor. Therefore in the energy usage 61 Watt have been added, .
********	440 grams of CO2/kWh
*****	The measurement was without the monitor. The corresponding monitor (Acer 19”TFT) uses 60,1 Watt so 83,62 in average, plus 60,1 Watt for the monitor

Gemiddeld verbruik computerapparatuur volgens Milieucentraal

Soort gebruik	Type of computer	Time of use	Yearly use (+ LCD-monitor) in kWh and €
E-mail and Internet	lowbudget computer	45 minutes a day	86 kWh 20 euro
Internet, E-mail, online TV, music and processing text	gemiddelde computer	6 hours a day including breaks	380 kWh 90 euro
fDownloading films, Internet, E-mail, online TV music and processing text	geavanceerde computer	14 hours a day (active use, downloading, inactive on)	845 kWh 200 euro
Gaming, Internet, E-mail, online TV ,music and processing text	zeer geavanceerde computer	6 hours a day including breaks	900 kWh 215 euro

(bron: http://www.milieucentraal.nl/pagina.aspx?onderwerp=Computers#Advies_op_maat_energiezuinig_gebruik_computer)

Computers are on a daily average of 25% idle (eg source: http://support.microsoft.com/kb/310601 and the thesis research of R. Maurik. The definition of idle in this context is: more than 1 minute no user interaction with computer, such as during business meetings, lunch, activities other user than computer interaction. Potentially there is much to save. This is particularly true when ESSaver during idle mode the monitor and other ancillary equipment turned off. The peripheral devices used with laptops often have more energy the laptop itself. In that case, much higher, savings

How much actual time savings to your organization will be investigated experimentally. The site www.milieucentraal.nl the reader expects that the savings could be greater than 50%. A competitor (who works with a hardware device to computers on standby) with its product claims € 20 per year to save money (this is between 30 and 50%). These are nothing more than assumptions. The actual saving rate depends on how your employees use computers and will be determined experimentally. ESSaver is the only product able to do so.

ESSaver logs per user / organization per day consumption and savings also enabled time and the number of seconds that saved (through which technique you use). In this way, a much better understanding of consumption and savings.

From the aforesaid parameters follows the 'Save Score'. This index tells us something about the degree full advantage of savings opportunities. Read more about the save score.