![\"Vane](\"http:\/\/qats.com\/cms\/wp-content\/uploads\/2011\/06\/Figure_1_Fan_A.png\" "\\"Figure_1_Fan_A\\"")
<\/a>Blower- Air flow is perpendicular to fan axis, low flow rate, and high pressure (figure 2)<\/p>\nTo select the appropriate fan we need to estimate the necessary airflow needed for a system. For low power, uniform heat loads we can use a simple steady state analysis to balance airflow and temperature rise. The power dissipation of the chassis and desired temperature rise are used in the following equation to obtain a target flow rate. For high heat loads, with concentrated heat sources you must design to the worst case component. Spot cooling may be accomplished with internal fans, heatsinks, ducting etc.<\/p>\n On Wednesday we’ll have the second part of this article<\/a>, covering the total system impendance curve and more on calculated flow rates.\u00a0 Click here to right to part 2.<\/a><\/p>\n References<\/span><\/em><\/p>\n Common Fan Laws for Electronic Enclosures<\/p><\/div>\n 1. Fan Cooled Enclosure Analysis Using a First Order Method, Ellison, Gordon, N., Electronics Cooling, Vol. 1, No. 2, October 1995, pp. 16-19.<\/p>\n 2. Practical Guide to Fan Engineering, Daly, Woods, Woods of Colchester, Ltd, 1992<\/p>\n 3. All you need to know about fans, Mike Turner, Electronics Cooling, Vol.1 May 1996<\/p>\n 4. Comair Rotron, Establishing Cooling Requirements: Air Flow vs. Pressure, www.comairrotron.com\/airflow_noe.shtml, March 12, 2007<\/p>\n","protected":false},"excerpt":{"rendered":" Designing a forced convection system for a chassis or cabinet is a complicated task which must be done correctly to ensure the performance and reliability of the enclosed electronics. There are many thermal, mechanical, and electrical effects to consider when … Continue reading <\/a><\/p>\n
\n
\n<\/a><\/a><\/p>\n<\/a>
![\n<\/a>](\"http:\/\/qats.com\/cms\/wp-content\/uploads\/2011\/06\/equations_for_determining_air_flow_target_flow_rate1.png\"){kind=link}