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Home Office Equipment Energy PDF Print E-mail
Written by Administrator   
Monday, 28 June 2010 11:02
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As you go about setting up your home office with a new computer, printer, fax, and perhaps even a copy machine, consider that this equipment will add to your electric bill. A single computer can not use more energy than your television, but once you put together an office full of equipment can certainly make its mark on your energy consumption.

Many electronic devices continue to use electricity even when turned off. Most take only a few watts, but with several pieces of office equipment, the power drain may be important. The only solutions are to physically disconnect these devices, or to turn off their power strips. It is easy, and it protects your equipment against power surges such as lightning.

You obviously have considerations other than energy when you buy your equipment, such as speed and capacity. Fortunately, you can find ENERGY STAR ® labels on almost all types of office equipment at all levels of speed and functionality. ENERGY STAR ® appliances will have lower operating costs than other aircraft.


The new computers tend to be more energy efficient than old ones. This is partly because demand for laptops or notebook computers has led manufacturers to produce components more efficient batteries to last longer. These efficiency improvements are now appearing in desktop machines. This does not mean they use less energy than older computers, however. Why? Because the new computers can do more - and that requires more power.

It is difficult to compare the energy consumption of computers. The nominal power levels on the nameplate gives the maximum power. They do not accurately reflect the average power consumption, which tends to be much lower. However, we can make some generalizations.

Laptops use less energy than desktops. A typical laptop uses a maximum of 15 watts and it turns off (goes to sleep) when not in use for several minutes. A typical desktop computer uses about 130 watts (including the screen). If you buy a single computer, a laptop offers the additional flexibility of being portable. On many laptops, you can connect a separate monitor and full-size keyboard to use when you're home.

For desktop computers, one ENERGY STAR ® shows you that the computer has a sleep function. Although not quite as good as turning the machine, which is very useful if you must leave your computer on all the time to receive faxes through a fax modem. Just check to ensure that the functionality of the computer to sleep, wake up incoming phone calls.

Computer monitors

Monitor accounts for about half the energy consumption of a typical computer configuration. larger screens use more energy than smaller - a 17-inch color screen consumes about 35% more energy than a 14-inch color screen. Colour monitors use up to two times more energy than monochrome. And high resolution monitors consume more energy than low-resolution models. Most monitors use cathode ray tube (CRT). But many laptop computers have liquid crystal displays (LCDs). Color LCD monitors consume only 10% to 20% more power per square inch than the CRT color.

Like computers, ENERGY STAR ® monitors have a typical sleep that powers them down (to 30 watts or less) after a period of inactivity. You can also reduce the energy consumption of your monitor by turning it off when not in use. Even if you are hesitant to turn off your computer for half an hour because you do not want to wait for it to start again, you can always turn off the monitor.


Printer energy consumption is highly variable. In general, the faster and higher quality of the printer, the more energy it uses. But the biggest differences are among different types of printer. Dot matrix printers are using relatively little power but lots of people do not like their print quality poor. Laser printers are energy pigs, both during use and active sleep.

If you do not need the speed and quality of laser printing, consider getting a printer with high quality ink jet, which will also cost far less in advance. Ink jet printers can not compete with lasers when it comes speed, but print quality is very good on the newer models - easily good enough for most home office uses. printer inkjet printer and paper used, so that you can print drafts on the back of earlier works. This feature also allows you to make prints on both sides. (Laser printers tend to jam if you feed them into the waste paper.) Reuse paper saves the energy used to make paper (or an average of 15 watt-hours of energy used to produce a single sheet of paper), and it saves you money from his purchase.

If you decide on a laser printer, you can reduce energy consumption significantly by obtaining a bit slower. And turn off the printer when not in use. Most of the energy of the printer is used while the machine is idle. ENERGY STAR ® printers, such as computers and monitors, go into a low power (sleep) mode when they have not been called to print for some time. If you get a high-end laser printer, look for one that can print double-sided.


A photocopier could be the highest user of energy in your home office, especially if you leave it on all day. Unless you use a copy center, you probably do not need a high-volume copier that can spit out 60 copies per minute. But even a low-volume copier uses 40-70 watts in standby mode and 1400-1600 watts while copying. These figures do not always appear on the material, but rather, they are often labeled only for peak power. Ask the dealer what the American Society for Testing and Materials (ASTM) Note energy is a copier you could buy. Find the most efficient model in the class speed you want.

All ENERGY STAR ® copiers have an energy saving (sleep) and set duplexing capability (that is, they can copy both sides). Look for a machine with a short "time to first copy" when you back to sleep. In addition, turn the copier off when you do not need to be ready to copy at any time.


Faxes can use a lot of energy because they are generally left on the service to receive incoming calls. Their energy consumption in standby can be larger than their active energy consumption. ENERGY STAR ® fax machines must have a standby low power and the ability to scan both sides of a sheet of paper. To further reduce power usage, you should consider turning off when a fax will not be used for some time.

There are currently four main types of fax marketing: direct thermal ink jet (which uses heat-sensitive coated paper), heat transfer (which can use regular paper), and laser.

Laser fax has the highest resolution printing and use the most energy. They are also very expensive. fax inkjet printers use less energy, and print with a relatively high resolution on plain paper. Machines that use thermal paper are the cheapest to buy, but the paper is about three times more expensive than regular paper, has a short lifespan, and it is difficult to write about. If you receive lots of fax, inkjet can afford the costs of paper saved in a year or two.

most fax machines can also be used to make copies. If you do not generally need a few copies based paper which can be supplied by the machine (versus pages of a book), you will not need to buy a separate copier.

Combining materials

The space is often considered for a home office, and you can have room for a separate copier, fax, printer and scanner. Handsets can save energy because you eliminate standby losses have four machines. ENERGY STAR ® labels now appear on the equipment combination most energy efficient.

Myths about office equipment home

Myth 1: It is better to leave computers that constantly turn them off when not in use.

This was true in the days of the mainframe, but is no longer true. The life of your hard drive is usually limited by the head disk interaction and mechanical wear, rather than by power surges and thermal cycling during startup. It is good practice to turn off your computer and monitor (and your printer and photocopier) if you do not intend to use them again in the next half hour.

Of course, many people now use a fax modem on home computers and may need to leave the central processing unit (CPU) on receipt of faxes. When this happens, at least turn off the monitor when not in use. Monitors, especially in color units, can use as much energy as the CPU. Some processors may also be put to sleep when faxes waiting, rather than left at full power.

Myth 2: Screen savers save energy.

Most savers Screensavers are not energy savings, unless they simply turn off the screen or in the case of laptops, turn off the backlight. flying toasters or fireworks use about as much energy as word processing. If you want to save energy and save the screen, turn off the monitor with the switch (or its AC adapter) when not in use.

Myth 3: laser printers do not use much energy when they are not printing.

Laser printers draw about one third of their power when they feel are pending. For a laser printer able to make eight pages per minute, which means 100 watts. Turn off your laser printer when not printing.

Myth 4: An ENERGY STAR ® computer turns off automatically ("put himself to sleep") when not in use for a certain period of time.

ENERGY STAR ® computers with the ability to sleep - but the function of sleep must be turned on before the computer shuts down automatically when not in use. Several computers come with this feature is disabled and it is not always clear how to activate. Make sure your new ENERGY STAR computer · comes with the feature of sleep on, or clear instructions on how to turn it on. Finally, use the sleep function only as a backup. You should always turn off the computer when not in use.

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