More fun with dimensional analysis
Or, a brief exercise in physics for those who still remember it (I don’t)
Yesterday at work I had to solve the following problem.
There is an FPGA chip that dissipates 5.7 Watts under full computation load. The chip is in an enclosure whose walls have effectively zero capacity to absorb heat. At one end of the enclosure, there is an aperture 11 mm tall and 11 cm wide, through which air flows at a rate of 40 LFM (linear feet per minute); the temperature of this air is 60 C. All the air exits at the rear of the enclosure through a similarly-shaped aperture. Assume the air becomes thoroughly mixed and thus homogeneous in temperature. Find the temperature of the exiting air.
September 10th, 2007 at 9:21 am
5.7w is how many btu? Power can’t convert directly to energy (btu). Probably gotta go through joules somehow.
11mm * 110mm * 40 = .52cfm
But doesn’t the volume of the enclosure make a difference? Assume not.