American Society of Heating Refrigerating and's 2009 ASHRAE Handbook - Fundamentals (I-P Edition) PDF

By American Society of Heating Refrigerating and Air-Conditioning Engineers

ISBN-10: 1615830014

ISBN-13: 9781615830015

ISBN-10: 1933742542

ISBN-13: 9781933742540

The 2009 ASHRAE guide - basics covers simple ideas and knowledge utilized in the HVAC&R undefined. up to date with learn backed by means of ASHRAE and others, this quantity contains 39 chapters overlaying normal engineering details, easy fabrics, weather facts, load and effort calculations, duct and pipe layout, and sustainability, plus reference tables for abbreviations and emblems, in addition to actual houses of fabrics. From the CD-ROM, the climatic layout stipulations tables were further to this reference, that includes climatic conditions for almost each significant urban on the planet.

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Additional info for 2009 ASHRAE Handbook - Fundamentals (I-P Edition)

Example text

6p1 (isothermal). Analysis must treat density change, as evaluated from the continuity relation in Equation (3), with frictional occurrences evaluated from wall roughness and Reynolds number correlations of incompressible flow (Binder 1944). In evaluating valve and fitting losses, consider the reduction in K caused by compressibility (Benedict and Carlucci 1966). Although the analysis differs significantly, isothermal and adiabatic flows involve essentially the same pressure variation along the conduit, up to the limiting conditions.

Note that p1 = p4 = p, U1 = U4 = U, and V1 = V4 = 0. 56 ft The term V22/2g can be calculated in a similar manner. In Equation (24), HM is evaluated by applying the relation between any two points on opposite sides of the blower. 5 ft of air. 89 in. of water. The head difference measured across the blower (between stations 2 and 3) is often taken as HM. It can be obtained by calculating the static pressure at stations 2 and 3. 03; the latter value is uncertain because of possible uneven discharge from the blower.

If Churchill’s expression for f is stored as a function in a calculator, program, or spreadsheet with an iterative equation solver, a solution can be generated. 31 in. 31 in. and adjust the valve as required to achieve the desired flow. 9 ft3/s. If the resulting value of H is greater than the given value of H = 72 ft, a larger pipe is required. If the calculated H is less than 72 ft, repeat using a smaller available pipe size. Control Valve Characterization for Liquids Control valves are characterized by a discharge coefficient Cd .

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2009 ASHRAE Handbook - Fundamentals (I-P Edition) by American Society of Heating Refrigerating and Air-Conditioning Engineers


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