PC COOLERS From : Gurwinder Singh To: Jeffery Aylesworth TYPES OF COOLERS ? Air coolers ? Liquid coolers LIQUID COOLERS ? Liquid coolers utilize water or other fluid to cool the pc. ? Use PC fans to cool the pc. AIR COOLERS OVERVIEW ? Common fan writes: outward (“squirrel confine”), hub, uncommon plans (counting outspread) ? Fan pivot bearing (clockwise or counterclockwise) is imperative in light of the fact that the edges and lodging are intended to coordinate stream just one way ? Pressure drop through the framework must be known to pick a fan.
? Fans are calmest when they work close pinnacle productivity; efficiencies are regularly given on fan bends. ? We will just take a gander at pivotal fans here in light of the fact that they are the most well-known compose utilized as a part of hardware cooling. Hub FLOW FANS ? Common composes: propeller, tubeaxial, vaneaxial ? Tubeaxial: impeller is inside a tube to control wind current and enhance execution ? Vaneaxial: like a tubeaxial aside from vanes either up or downstream of the impeller are utilized to lessen whirl and enhance execution ? Used to convey expansive stream rates however little increment in weight ? Examples incorporate fans utilized for ventilation without ventilation work, portable room fans, and fans used to cool PCs Tubeaxial fan for PC cooling Tubeaxial fan for ventilation Vaneaxial fan for high air protection gadgets cooling Straightening vanes are situated inside tube ANEAXIAL FLOW FAN V Source: ASHRAE Handbook ? Fan bends are regularly given as far as aggregate weight versus volumetric stream rate ? A common fan running at a settled speed can give a more noteworthy volumetric stream rate for frameworks with littler aggregate weight drops (in case we’re to one side of the crest in the fan bend). ? Total weight loss=static weight loss+dynamic weight misfortune 1 DP = (P – P ) + r (V 2 – V 2 ) add up to in,static out ,static 2 in out SYSTEM PRESSURE EFFECTS ? If exit and channel zone of a conduit are about the same, the dynamic weight misfortune (or pick up) might be insignificant. ? Manufacturer will give a fan bend to each fan he or she delivers.
? The fan bends anticipate the weight stream rate execution of each fan. ? Choose a fan that gives you the volumetric stream rate you requirement for your framework weight drop. ? Choose a fan that has its pinnacle productivity at or close to your working point.
? Sometimes will give information in a table instead of in a chart. FAN CURVES FAN CURVES Source: ASHRAE Handbook FAN LAWS Fan information for geometrically comparative fans can be crumpled onto a solitary bend utilizing dimensionless numbers dimensionless stream rate P1 = Q D3N Q=volumetric stream rate D=fan distance across dimensionless weight rise P2 = DP r D2 N 2 N=fan rotational speed W=fan control r =fluid thickness dimensionless power P3 = W r D5 N 3 DP=fan weight rise FAN LAWS ? The laws just apply to efficiently comparative fans at a similar purpose of rating on the execution bend. ? Under these conditions, the dimensionless parameters will be constants. For instance, if fan operation moves from guide 1 toward point 2, the estimations of the dimensionless parameters won’t change and consequently can be utilized to evaluate framework impacts.
? Be watchful about utilizing the fan laws to decide the impact of fan speed change – you may move to an altogether different spot on the execution bend, which will discredit your outcomes. FAN LAWS ? Law 1 – identifies with impact of evolving size, speed, or thickness on volume stream, weight, and power level ? Law 2 – identifies with impact of evolving size, weight, or thickness on volume stream rate, speed, and power ? Law 3 – demonstrates impact of evolving size, volume stream, or thickness on speed, weight, and power TWO FANS IN PARALLEL OR SERIES ? For two indistinguishable fans in parallel, you can influence your own fan to bend by taking the first fan bend and multiplying the volumetric stream rate for a given weight. ? For two indistinguishable fans in arrangement, you can influence your own particular fan to bend by multiplying the weight drop for a given volumetric stream rate. ? Which would be better to cool PC chasses? ? Watch out: “If in parallel you put your fans too close to, their in-and surges will have a tendency to meddle.” Tony Kordyban Fans in arrangement Fans in parallel FANS IN SERIES AND PARALLEL indistinct vague unclear
