Selecting a Fan for the Run II Trigger Framework Racks -------------------------------------------------------- Original Rev: 6-MAY-1996 Most Recent Rev: 24-JUNE-1996 We currently have reserved 6U i.e. 10.5" for the blowers in each rack. If the blowers mount to a 1U frame then the height of the blowers can be at the most 6U - 1U = 5U = 8.75 inches. We will have 6KW of power available in each rack. It is not yet clear how much of this power will actually be used. At normal temperature, humidity and pressure it requires 320 CFM to move 1 KW with a 10 degree Fahrenheit temperature rise. Everything scales as expected, e.g. twice the heat --> twice the CFM or else twice the temperature rise. The expected air flow resistance (aka static pressure) will be in the order of 1 inch H20. The Run 1 system ran at around 1.3 or 1.4 inches H20 differential pressure between the input air rack and the output air rack. As a starting point lets assume that we will dissipate about 5 KW in each rack. This 5 KW is a combination of power actually dissipated on the THE Cards, power supply efficiency losses, and blower motor heat losses. The 10 degrees Fahrenheit temperature rise would be nice if we can hold it so this would require about 1600 CFM. So what blowers can we find that fit in 10.5 inches and that can move 1600 CFM. It would be very nice if they had 3 phase motors, i.e. serious industrial motors. FASCO Model 21-800-2 This is a dual blower. It is 8.83" tall and about 13.5" long. Pressure 0 0.5 0.8 1.0 1.5 2.0 3.2 CFM 800 750 700 675 600 500 0 But FASCO tells me that they really do not make this blower. The specifications for this blower just show what they could make if they wanted to. Sounds like Cheese Shop. ebm/Papst Model D2E133-DB21-47 This is a dual inlet single blower. It is 8.4" tall and 9" or 10" long. Pressure 0 0.5 0.8 1.0 1.5 ? CFM 800 340 300 260 100 0 We purchased two of these. They have the interesting property of cooking the motor is there is not enough back pressure. And, they do not move enough air. Zero McLean nothing this big Kooltronic Model KBB451 This is a dual blower. It is 8 1/4" tall and 13" or 14" long. Each outlet opening is 3 1/4" x 3 1/4" = 21.125 sq in total for both openings. The catalog says that one can get this blower with a multi phase motor but the sales person says No multi phase. Pressure 0 0.5 0.8 1.0 1.5 2.0 3.0 CFM 800 720 660 640 570 460 0 Kooltronic Model KBB443 This is a dual blower. It is 7 3/8" tall and 16" or 17" long. Each outlet opening is 3 3/8" x 4 3/4" = 32.1 sq in total for both openings. The catalog says that one can get this blower with a multi phase motor but the sales person says No multi phase. Pressure 0 0.5 0.8 1.0 1.5 2.0 3.0 CFM 920 825 760 725 560 200 0 Price and delivery of the Kooltronics Model KBB443 is $349 and 6 weeks.