Computer systems consume power. The amount of power depends on the system at hand. It can vary widely depending on the hardware build into the computer system. A high end user’s computer with the latest hardware will consume more power than an Office computer system that uses low end hardware. High end computer systems use 250 Watts or more per hour which equals 1 kWh every four hours of usage. The US average energy costs for 1 kWh are $0.11. This varies a lot in the country but also worldwide. The costs of 1 kWh in Germany average around $0.27 for example.

A computer running 24 hours a day using 100 Watts per hour will need 876 kWh a year which would equal $96 when using the US average and $236 in Germany. If the computer uses 250 Watts instead the costs would rise to 2190 kWh per year which would equal $240 in the US and $591 in Germany. Not all computer systems are running 24 hours though but it is probably good to know some maximum values. Keep in mind that energy costs are on the rise and that it will also reduce heat and noise.

1. Buy energy efficient products

Considering energy efficient products is a good way to save energy in the first place. Look for logos like the Energy Star to buy computer hardware that offers a good energy efficiency. Another good idea is to look for a 80+ power supply unit which is more energy efficient as well. (See 80 Plus Power Supply Units)

2. Use build in power saving features

Most operating systems come with power saving features that put hardware like hard drives or the computer monitor into idle mode or turn it off for the time it is not being used. Idle mode consumes between 20 to 50 times less energy. Windows users find the power saving settings in the Control Panel. It might be necessary to tweak the values for turning off the computer monitor, hard drives and setting a system standby time to suit the individual needs. A lower time will save more energy but is also likelier to affect work.

This also includes the possibility to underclock hardware. A high end video card is only needed with its full power when playing the latest computer games. It is definitely not needed in most other situations. Underclocking the video card will save energy (read create video card profiles to save power) The same is true for processors.

3. Turn down the brightness

Turning down the brightness of the computer monitor, or any other monitor actually, saves energy. This is actually a good tip for users with laptops, netbooks and other mobile devices including cell phones. It can also be helpful on desktop systems.

4. Turn off the monitor instead of using a screensaver

Screensavers do not save energy. Their function these days is reduced to visuals only. Turning off the computer monitor instead of running screensavers saves lots of energy.

5. Disable devices that are not needed

Laptops come with all sorts of devices that a user might not need. Each of the devices – if enabled – consume energy. A laptop user that uses the build in network adapter and a cable to connect to the Internet probably does not need Wi-fi, the build in modem, Bluetooth or infrared. The same might be valid for other devices like the DVD drive or sound card.

6. Turn off the computer

This might be an obvious tip but there are a few myths surrounding this. Some users think that turning off a computer will reduce its lifetime. Others believe that it will cost more power to turn the computer off and on again than to put it to hibernate mode.

It might not make sense to turn off a computer system when going on a 5 minute break but it definitely make sense for longer breaks, e.g. lunch or meetings.

7. Share hardware where appropriate

Hardware like printers, scanners or routers that are connected to a computer system are also using power. A way to save energy is to share these devices where possible. This does require some computer knowledge though.

Energy Saving Verdict: It is possible to save lots of energy by turning off devices when they are not needed. Buying energy efficient hardware and using power saving settings are the two other helpful options.

Do you have anything to add? Let us know in the comments.

Related posts

• Save Energy with Local Cooling (0)
• PC Power Management Software PowerSlave (4)
• Microsoft Hohm Beta Public (1)
• Computer Power Management Software Edison (4)
• Save Energy With All Off (14)

Does it sound like a crazy sci-fi stuff to you? It did to me until I found out that the SPR Ltd. company standing behind the project gained a fund of L125.000 from the UK government for further development and improvement. I seriously doubt British government would invest such a pile of bucks into some kind of trickery. Moreover, despite all criticism and disbelief at the beginning, the scientists have proven their prototype worked exactly as presumed by mathematical calculations supplied by Dr. Richard Paris, prof. of math on the University of Abertay, Dundee. Their project is also supported by a large theory explaining the idea in the language far beyond my comprehension (I didn’t really even try to understand that stuff :).

So called “EmDrive” is an experimental thruster converting the electrical energy to a pure power – thrust – without using any conventional propellant in the conversion process. The experimental engine itself has a shape of cavity, wide on one side and narrow on the other side, while the microwave energy is being put in from the source on the narrow side and so called “net force” (thrust) being emitted on the other side.

The project has been divided into 3 periods; The first generation engine was only supposed to become a proof of concept working in the room temperature and lifting a small weight. The second generation experimental engine supported by the grant from UK government was able to make a 100 kg weighing platform slowly move when propelled with an input power of 334 W (watch video). That’s definitely not worth the consumptive power you might say and you’d be right. But this is not where it ends.

After approving the calculations and checking that it obeys all physical laws the third generation superconducting engines are coming. This is where it starts to be really interesting. According to their claims, such superconducting engine should be able to lift an object weighing up to 3 tons when using an input power of 1 kW (!); That means it would be theoretically possible to lift 3 tons with an engine supplied by 2 or 3 computer PSU…

It’s always possible that something goes wrong but as all tests and calculations are showing, this project looks really promising at the moment. The main aspect that made me start to believe this might be true was the fact that British government supports it. Maybe the time of hovercraft’s is simply closer than we are willing to believe…

Additional information:
EmDrive.com
NewScientist.com
TheEngineer.co.uk

Related posts

• 7 Computer Energy Saving Tips (7)