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Objectives

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Duct design HW4 HW4 DUE: April 10 ... Objectives Author: Jeffrey Siegel Last modified by: CFDprc1 Created Date: 10/7/2004 2:07:20 AM Document presentation format: On ... – PowerPoint PPT presentation

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Title: Objectives


1
Objectives
  • Air Distribution Systems
  • Duct design
  • HW4

2
HW4
  • DUE April 10, 2013
  •  
  • Problem 18.13
  • (Use TITUS Square Ceiling MCD diffuser
  • http//www.titus-hvac.com/ecatalog/subcategory.asp
    x?refid186)
  • Problem 18.16
  • (The building size is 100 ft x 60 ft use
    proportion to determine room sizes)
  • Problem 18.19
  • Problem 18.20
  • Problem 18.27 (design problem)

3
Relationship Between Static and Total Pressure
4
Duct Design
  • Total and static pressure drops are proportional
    to square of velocity
  • Plot of pressure drop vs. volumetric flow rate
    (or velocity) is called system characteristic

5
System Characteristic
6
Electrical Resistance Analogy
7
Frictional Losses
8
Non-circular Ducts
  • Parallel concept to wetted perimeter

9
Dynamic losses
  • Losses associated with
  • Changes in velocity
  • Obstructions
  • Bends
  • Fittings and transitions
  • Two methods
  • Equivalent length and loss coefficients

10
Loss Coefficients
?Pt CoPv,0
11
(No Transcript)
12
Example 18.7
  • Determine total pressure drop from 0 to 4

13
Conversion Between Methods
14
Reading asignement
  • Chapter 18
  • 18.1-18.4 (including 18.4)
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