This guide covers easy ideas and information utilized in the HVAC&R undefined. up-to-date with learn subsidized via ASHRAE and others, this quantity comprises 1,000 pages and 39 chapters overlaying normal engineering details, simple fabrics, weather info, load and effort calculations, duct and pipe layout, and sustainability, plus reference tables for abbreviations and emblems, I-P to SI conversions, and actual homes of fabrics.
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Additional resources for 2009 ASHRAE Handbook - Fundamentals (SI Edition)
DdeWitt. 2002. Fundamentals of heat and mass transfer, 5th ed. Wiley, New York. Ito, H. 1962. Pressure losses in smooth pipe bends. Journal ofBasic Engineering, ASME Transactions 4(7):43. A. L. Haberman. 1980. Introduction tofluid mechanics, 2nd ed. Prentice Hall, Englewood Cliffs, NJ. J. 1959. On the nature of stall. Journal ofBasic Engineering, ASME Transactions 81D:305. W. G. Hammitt. 1970. Cavitation. McGraw-Hill, New York. J. 1962. Low velocity sudden expansion pipe flow. ASHRAE Journal 4(7):43.
5, and the valve is a fully open globe valve with K = 10. The pipe roughness is 250 pm. 01 mm2/s. 3. Use this value of Q to recalculate Re and get a new value off: 4. Repeat until the new and old values off agree to two significant figures. 047 m3/s = 4 1 Lis. If the resulting flow is in the fully rough zone and the fully rough value offis used as first guess, only one iteration is required. c. For H = 22 m, what diameter pipe is needed to allow Q = 55 Lis? Solution: The energy equation in part (b) must now be solved for D with Q known.
When this is not possible, the flow must be changed or the device must be built to withstand cavitation effects. Some materials or surface coatings are more resistant to cavitation erosion than others, but none is immune. Surface contours can be designed to delay the onset of cavitation. NOISE IN FLUID FLOW Noise in flowing fluids results from unsteady flow fields and can be at discrete frequencies or broadly distributed over the audible range. With liquid flow, cavitation results in noise through the collapse of vapor bubbles.