By Samuel C. Sugarman
Thoroughly revised, this e-book offers the reader with an figuring out of the rules and practices of trying out and balancing (TAB) heating, ventilating, and air-con (HVAC) air and water platforms. For the beginner and the skilled checking out and balancing technician, it's a box reference ebook of systems, equations, and data tables.
Divided into 5 components, half I has normal and particular balancing methods for consistent air quantity platforms, variable air quantity platforms, go back air structures, and fanatics and fan functionality. half II covers trying out and balancing fume hood platforms and cleanrooms, commissioning HVAC platforms, centrifugal pumps and pump functionality, analog and electronic controls and water balancing approaches utilizing move meters, method parts, and temperatures. half III covers enthusiasts, pumps, air distribution, water distribution, automobiles, electric, fluid stream, psychrometrics, refrigeration, and device utilization and care. half IV comprises equations and tables. New to this version, half V has details and extra attempt and stability techniques and photos for chapters 1-7 and 13-14. TAB information and try out types are within the new addendum as well.
• offers the readers with revised information regarding the rules and practices of checking out and balancing (TAB) heating
• Represents a box reference consultant for either the beginner and skilled checking out and balancing technician
• encompasses a new part with info and extra attempt and stability approaches and graphics
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Extra info for Testing and balancing HVAC air and water systems
1. 1: Find the equivalent duct diameter of a duct that's 24" wide by 20" high. 7) upstream from obstructions. Large variations in the readings show there's considerable turbulence in the duct and not a proper location for the traverse. 2. For convenience in taking a traverse, the Pitot tube is marked with a stamped number at the eveninch points and oddinch points are indicated by a 1/8"long stamped line. The sum of each will be the diameter of the duct. Mark the Pitot tube as described above using the constants for 10" or smaller duct.
Indications are that some capture hoods may read low when measuring linear air diffusers. It's also important to understand that these flow factors apply only when using the instrument specified by the outlet manufacturer and in the prescribed method. The cfm calculated at the outlet divided by the cfm at the traverse point is the flow factor. Because the air outlets are Page 51 on the low pressure side of any system the following proportional balancing procedure can be used on constant or variable air volume systems: low, medium, or high pressure systems; or single zone, multizone, or dual duct systems.
92 rounded off) for each 100' above sea level. 6". A Pitot tube traverse is made of the branch and the difference between the total cfm of the three outlets and the cfm from the traverse is the cfm of the fourth outlet. The pressure drop will be very low if the damper is wide open. A higher total cfm at the outlets than at the traverse is probably from inaccuracies in reading the traverse and/or outlets. Correct diversity. Consult the manufacturer's data. Poor duct design or duct installation at the fan inlet and outlet.