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

By American Society of Heating Refrigerating and Air-Conditioning Engineers

The 2009 ASHRAE guide - basics covers easy rules and information utilized in the HVAC&R undefined. up to date with learn backed through ASHRAE and others, this quantity comprises 39 chapters protecting normal engineering details, easy fabrics, weather info, load and effort calculations, duct and pipe layout, and sustainability, plus reference tables for abbreviations and logos, in addition to actual homes 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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The Bernoulli equation of steady flow, Equation (21), as an integral of the ideal-fluid equation of motion along a streamline, then becomes dp V 2 ------ + ------ = constant U 2 (55) where, as in most compressible flow analyses, the elevation terms involving z are insignificant and are dropped. For a frictionless adiabatic process, the pressure term has the form 2 ³ For Mach numbers less than one, 2 U1 V1 M1 § 2 – k · 4 p s = p 1 + -----------2 1 + ------- + ¨ ----------- ¸ M 1 + } 4 © 24 ¹ (60) When M = 0, Equation (60) reduces to the incompressible flow result obtained from Equation (9).

Both U and v may vary over the cross section A of the conduit. When flow is effectively incompressible (U = constant) in a pipe or duct flow analysis, the average velocity is then V = (1/A)³ v dA, and the mass flow rate can be written as m· = UVA (4) Q = m· e U = AV (5) or where Q is volumetric flow rate. Bernoulli Equation and Pressure Variation in Flow Direction The Bernoulli equation is a fundamental principle of fluid flow analysis. It involves the conservation of momentum and energy along a streamline; it is not generally applicable across streamlines.

9 cfs? Solution: The energy equation in part (b) must now be solved for D with Q known. This is difficult because the energy equation cannot be solved for D, even with an assumed value of f. 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.

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