By Samuel C. Sugarman
This booklet offers the entire info it is very important assessment and stability the air and water facets of any HVAC procedure. This re-creation comprises assurance of pneumatic, electrical, digital, direct electronic, proportional, necessary and by-product regulate structures. each element of checking out, adjusting and balancing is addressed, together with every kind of tools required, and particular easy methods to modify consistent quantity, unmarried sector, twin duct, induction, and variable air quantity structures. whole info are supplied for the complete scope of approach elements, together with fanatics, pumps, cars, drives and electrical energy, in addition to for balancing units and software utilization.
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Additional info for Testing and Balancing HVAC Air and Water Systems
05 *Calculated for the purposes of this exercise only to illustrate what is happening at the outlets already set. Once an outlet or branch damper is set the cfm is normally not reread until the final balance and generally there is no need to calculate the airflow. e. Go to outlet No. 4 and read it. In this example it still reads 340 cfm, 113%D. Outlet No. 4 and No. 2 aren’t within 10% of each other Proportionally Balancing Constant Volume Low Pressure Systems 55 (113%/95%). Arbitrarily cut No. 4 to 100%D or 300 cfm.
Note on the report forms that it’s field-measured and is probably not a reliable value to be entered on the fan performance curve. 2. Indirectly determine fan static pressure. a. Take fan speed. 26 Testing and Balancing HVAC Air and Water Systems b. Get the fan performance curve from the fan manufacturer, if possible, with the field-measured rpm plotted on the curve. If this rpm isn’t plotted, you must do it. Accurately determine total airflow. Enter the fan curve at the total airflow. Draw a line vertically until it intersects the field-measured rpm curve.
Pitot tube locations for traversing round ducts are given in Figure 3-3. Mark the Pitot tube as described above using the constants for 10” or smaller duct. Basic Air Balance Procedures Common to All Systems 33 Square or Rectangular Duct Traverse (Figure 3-4) To make a Pitot tube traverse of a square or rectangular duct determine: (1) the number and distance of the holes in the duct and (2) the markings on the Pitot tube. The number of holes drilled, their distance apart and the number of Pitot tube marks are based on a minimum of 16 velocity pressure readings taken at centers of equal areas and the centers of the areas not more than 6” apart, so that no area exceeds 36 square inches.