9/18/2023 0 Comments 27 cfm airflow![]() If noise is not a limiting factor, then installing fans with the most flow will assure the lowest internal temperatures and longest component life. Please keep in mind the following discussion is directed at applications where noise is of some concern. Fans that are physically larger typically are more quiet because you can get the same volume of air flow with a lower fan RPM. Because the chassis pressure impedance curve (pressure required to move air) is nonlinear, doubling fan capacity does not double the air delivery. Often, the bigger fan is simply stirring the air and providing no real additional cooling benefit. “Bigger” used in this context refers to the speed and free air flow rating of the fan. The problem with bigger fans is they generate significantly more noise than smaller fans. But if you package six chassis in a rack and put several racks in a room, the combined noise can be deafening. We are seeing more specifications that include a noise limit for normal operation. This is becoming more pronounced with the high speed processors such as dual Xeon which require 200Watts just for the motherboard. However, noise is often a limiting factor for chassis selection with conflicting requirements for operating temperature versus low noise generation. System cooling performance should be determined to assure cards are not operated above their published temperature limits. ![]() However, four fans will cost about $80 or 25% of the chassis cost but a small percentage of the integrated system cost. This is not significant compared to the total system cost. A 4-½” fan will cost about $5 more than a 3-½” fan. In general, a single fan, regardless of size, will cost about $20 with installation, grills, etc. This works well if cost and noise are not factors. The first is to simply install as many of the biggest fans available as will fit. There are two methods for selecting a fan. In general, a 10 deg C temperature reduction will provide a 2:1 increase in MTBF. You will see most manufacturers’ operating temperature and power supply specifications are unrealistic and not supportable.Īdditional cooling allows for higher power boards to be installed plus extends component life by limiting the maximum temperatures the components are exposed to. Otherwise, the following information will demonstrate the maximum ambient temperature any industrial chassis can safely operate in as well as help with chassis noise reduction. If high ambient temperatures or noise are not an issue, you can skip this section. Clone computers run at a negative internal pressure and become very dusty inside. ![]() Industrial computers provide a positive chassis pressure to control dust entry. The typical office clone computer simply uses the one small fan in the power supply for cooling. Industrial computers typically provide between one and four fans pulling through air filters in addition to the fan in the power supply. One of the main differences between an industrial computer and an office clone computer is cooling. Chassis Temperature Rise From Installed Cards.This White Paper provides generalized information on chassis cooling, noise generation and fan failure issues for industrial computers. Cooling and Noise in Industrial and Military Computer Systems
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