llo everyone, I'm an entry level engineering working at a consulting firm that designs HVAC systems. I took a class on HVAC systems, pneumatics and hydronics and I know how to size units, ducts, etc. However, I haven't done the calculations in years.
My boss told me to verify the sizing done the extension of a building. We need to provide a system for an area space of 26 meters by 3.5 meters. We chose a 60,000 BTU unit for it. The duct work is a straight line across, so it doesn't get any easier than that. The AC unit is located 19 meters from the wall on the left side and 7 meters from the right one. Therefore, the duct from the unit splits in 2 at .7 meters making 90 degree angles ( one to the left, the other to the right). We are using 7 diffusers, 4 on the left and 3 on the right.
The CFM is 2000, and I distributed the CFM evenly on each side. The long side with 4 diffusers have 352 cdm each, and the 3 on the right 198 cfm each. The current design on the drawing has 326 cfm for the right ones and 348 cfm for the left ones. Either I'm wrong or he is wrong.
I have trouble finding the static pressure of the blower. I can't see it on the specs. Do you know how much is should be for a split ducto unit YAU-60CW? Please help me. Thanks
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