Computer fan
Computer fans are found inside the computer case and help prevent the various computer parts inside from overheating. Without them, components of your computer can malfunction, become damaged, or even crash. However, there is different kinds of fans, and each one of them have a different function and size, so now I will write some of them, with their size and functions.
Cooling fans applications
1- Case mount :
Used to aerate the case of the computer. The components inside the case cannot dissipate heat efficiently if the surrounding air is too hot. Case fans move air through the case, usually drawing cooler outside air in through the front (where it may also be drawn over the internal hard drive racks) and expelling it through the rear. There may be a third fan in the side or top of the case to draw outside air into the vicinity of the CPU, which is usually the largest single heat source. Standard case fans are 80 mm, 92 mm, 120 mm, 140 mm, 200 mm, 230 mm in width and length. As case fans are often the most readily visible form of cooling on a PC, decorative fans are widely available and may be lit with LEDs, made of UV-reactive plastic, and covered with decorative grilles. Decorative fans and accessories are popular with case modders. Air filters are often used over intake fans, to prevent dust from entering the case.
A power supply (PSU) fan often plays a double role, not only keeping the PSU itself from overheating, but also removing warm air from inside the case. PSUs with two fans are also available, which typically have a fan on the inside to supply case air into the PSU and a second fan on the back to expel the heated air.
2- CPU fan
Used to cool the CPU (central processing unit) heat sink. Effective cooling of a concentrated heat source such as a large-scale integrated circuit requires a heat sink, which may be cooled by a fan; use of a fan alone will not prevent overheating of the small chip.
3- Graphics card fan
Used to cool the heat sink of the graphics processing unit, or the memory on graphics cards. These fans were not necessary on older cards because of their low power dissipation, but most modern graphics cards designed for 3D graphics and gaming need their own dedicated cooling fans. Some of the higher powered cards can produce more heat than the CPU (dissipating up to 289 watts), so effective cooling is especially important. Since 2010 graphics cards have been released with either axial fans or a centrifugal fan commonly known as a blower or squirrel cage fan.
4- Chipset fan
Used to cool the heat sink of the Northbridge of a motherboard's chipset; this may be needed where the system bus is significantly overclocked and dissipates more power than as usual, but may otherwise be unnecessary. As more features of the chipset are integrated into the central processing unit, the role of the chipset has been reduced and the heat generation reduced also.
Less commonly, used for other purposes;
5- PCI slot fan
A fan mounted in one of the PCI slots, usually to supply additional cooling to the PCI and/or graphics cards.
6- Hard disk fan
A fan mounted next to or on a hard disk drive. This may be desirable on faster-spinning hard disks with greater heat production. As of 2011 less expensive drives rotated at speeds up to 7,200 RPM; 10,000 and 15,000 RPM drives were available but generated more heat.
7- CD burner fan
Some internal CD and/or DVD burners included cooling fans.
8- Memory fan
Modern computer memory can generate enough heat, especially when overclocked, that active cooling may be necessary, usually in the form of small fans positioned above the memory chips
Causes of the heat; There is different reasons that effect on computers fan, so you need to be careful about, Computer Location, so the Carpet is not the best places to put computers. Because of their heat-retaining properties, Computer Habitat , Because they are active electronic devices and circulate air, and Routine Maintenance because they are designed to draw heat away from a component via a series of "fins."
Used to aerate the case of the computer. The components inside the case cannot dissipate heat efficiently if the surrounding air is too hot. Case fans move air through the case, usually drawing cooler outside air in through the front (where it may also be drawn over the internal hard drive racks) and expelling it through the rear. There may be a third fan in the side or top of the case to draw outside air into the vicinity of the CPU, which is usually the largest single heat source. Standard case fans are 80 mm, 92 mm, 120 mm, 140 mm, 200 mm, 230 mm in width and length. As case fans are often the most readily visible form of cooling on a PC, decorative fans are widely available and may be lit with LEDs, made of UV-reactive plastic, and covered with decorative grilles. Decorative fans and accessories are popular with case modders. Air filters are often used over intake fans, to prevent dust from entering the case.
A power supply (PSU) fan often plays a double role, not only keeping the PSU itself from overheating, but also removing warm air from inside the case. PSUs with two fans are also available, which typically have a fan on the inside to supply case air into the PSU and a second fan on the back to expel the heated air.
2- CPU fan
Used to cool the CPU (central processing unit) heat sink. Effective cooling of a concentrated heat source such as a large-scale integrated circuit requires a heat sink, which may be cooled by a fan; use of a fan alone will not prevent overheating of the small chip.
3- Graphics card fan
Used to cool the heat sink of the graphics processing unit, or the memory on graphics cards. These fans were not necessary on older cards because of their low power dissipation, but most modern graphics cards designed for 3D graphics and gaming need their own dedicated cooling fans. Some of the higher powered cards can produce more heat than the CPU (dissipating up to 289 watts), so effective cooling is especially important. Since 2010 graphics cards have been released with either axial fans or a centrifugal fan commonly known as a blower or squirrel cage fan.
4- Chipset fan
Used to cool the heat sink of the Northbridge of a motherboard's chipset; this may be needed where the system bus is significantly overclocked and dissipates more power than as usual, but may otherwise be unnecessary. As more features of the chipset are integrated into the central processing unit, the role of the chipset has been reduced and the heat generation reduced also.
Less commonly, used for other purposes;
5- PCI slot fan
A fan mounted in one of the PCI slots, usually to supply additional cooling to the PCI and/or graphics cards.
6- Hard disk fan
A fan mounted next to or on a hard disk drive. This may be desirable on faster-spinning hard disks with greater heat production. As of 2011 less expensive drives rotated at speeds up to 7,200 RPM; 10,000 and 15,000 RPM drives were available but generated more heat.
7- CD burner fan
Some internal CD and/or DVD burners included cooling fans.
8- Memory fan
Modern computer memory can generate enough heat, especially when overclocked, that active cooling may be necessary, usually in the form of small fans positioned above the memory chips
Causes of the heat; There is different reasons that effect on computers fan, so you need to be careful about, Computer Location, so the Carpet is not the best places to put computers. Because of their heat-retaining properties, Computer Habitat , Because they are active electronic devices and circulate air, and Routine Maintenance because they are designed to draw heat away from a component via a series of "fins."
summery and Choosing the best case fans
Choosing the right case fan is important for optimum results. So while the concept of a case fan is fairly simple, ensuring that an optimal unit is purchased can be a little more complex. Different types of case fan are suited to different computer needs; they all help cool a system, but some do the job more efficiently than others. Though stock case fans help move hot air away from system elements, there are replacements that cool the components down much more efficiently.
Reference
Nathan Kirsch, (Mar4, 2007). The CoolIT Systems RAM Fan Review, retrieved from http://www.legitreviews.com/the-coolit-systems-ram-fan-review_469
wiseGEEK, (n.d), what is computer fan ?. Retrieved from http://www.wisegeek.com/what-is-a-computer-fan.htm
Wire Pulse Width Modulation (PWM) Controlled Fans. (2005), retrieved from http://www.formfactors.org/developer/specs/4_Wire_PWM_Spec.pdf
How to Choose the Best Case Fan for Your Computing Needs. (August 20, 2013). Retrieved from http://www.ebay.com/gds/How-to-Choose-the-Best-Case-Fan-for-Your-Computing-Needs-/10000000177629239/g.html
wiseGEEK, (n.d), what is computer fan ?. Retrieved from http://www.wisegeek.com/what-is-a-computer-fan.htm
Wire Pulse Width Modulation (PWM) Controlled Fans. (2005), retrieved from http://www.formfactors.org/developer/specs/4_Wire_PWM_Spec.pdf
How to Choose the Best Case Fan for Your Computing Needs. (August 20, 2013). Retrieved from http://www.ebay.com/gds/How-to-Choose-the-Best-Case-Fan-for-Your-Computing-Needs-/10000000177629239/g.html