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Announcement Course Exam October 11 th (Tuesday) In class: 90 minutes long Examples are posted on the course website
Objectives Duct Design and Diffuser Selection Reading assignment: thextbook Chapter 18
Duct design (part of the HVAC Design successfully integrated into BIM)
Pressures Static pressure Velocity pressure Total pressure – sum of the two above
Relationship Between Static and Total Pressure
Duct design method (defines the layout) Two design methods: -Equal friction -Static regain
Static pressure drop (friction losses) in a duct is proportional to square of velocity or flow Duct Design It is a function of -Dynamic pressure -Length -Pipe diameter -Friction coefficient
Frictional Losses (in a staring round duct section)
Non-circular Ducts Parallel concept to wetted perimeter
Dynamic (or local) losses Losses associated with Changes in velocity Obstructions Bends Fittings and transitions Two methods Equivalent length and loss coefficients
Dynamics (Local) Loss Coefficients ΔP t = C o P dynamic
Conversion Between Methods
Example 18.7 Determine total pressure drop from 0 to 4
Diffuser selection Defines thermal comfort Air quality
Forced driven air flow Diffusers Linear diffusers Grill (side wall) diffusers Horizontal one side Vertical
Diffusers types swirl diffusers wall or ceiling floor Valve diffuser ceiling diffuser
Diffusers http://www.titus-hvac.com/techzone/ http://www.halton.com/halton/cms.nsf/www/diffusers Perforated ceiling diffuserJet nozzle diffuser Square conical ceiling diffuser Round conical ceiling diffuser Wall diffuser unitSwirl diffuser Floor diffuser Auditorium diffuser DV diffuser External louvre Smoke damper Linear slot diffuser
Low mixing Diffusers Displacement ventilation
AIR DISTRIBUTION (Additional information. Also see Chapter 18) General The proper delivery of air for heating, cooling, or ventilation is a crucial part.
Elementary Mechanics of Fluids
SUPPLY DUCT SYSTEMS (Additional information. Read sections 18.4, 18.5, & 18.6) General –The supply duct system conveys conditioned air from an AHU to the.
1 HVAC SHEET METAL SHEET METAL THEORY. 2 THE AIR DISTRIBUTION SYSTEM SHEET METAL IS USED FOR: – PLENUM’S (RETURN & SUPPLY) –TRUNK LINES –RETURN AIR GRILLS.
Convection in Flat Plate Turbulent Boundary Layers P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Extra Effect For.
Heating and Air Conditioning I
Nonmetallic ducts (Additional information) –Fiberglass (also see section 18.5) Made of glass wool insulating material in which the stranded fiber wool.
Objectives Finish with ducts and fans Define project topics.
AIR FLOW IN DUCTS Shaharin Anwar Sulaiman
MECH 221 FLUID MECHANICS (Fall 06/07) Chapter 9: FLOWS IN PIPE
HVAC 13a CNST 305 Environmental Systems 1 Dr. Berryman
Reynolds Experiment Laminar Turbulent Reynolds Number
ES 202 Fluid and Thermal Systems Lecture 12: Pipe Flow Overview (1/9/2003)
California State University, Chico
Unit: V-Flow Through Pipes. Flow Through Pipes Major Energy Losses - Darcy-Weisbach Formula - Chezy’s Formula Minor Energy Losses -Sudden expansion.
Chapter 11: Space Air Diffusion Conditioned air is normally supplied to air outlets at velocities much higher than would be acceptable in the occupied.
Lesson 23 HEAD LOSS DEFINE the terms head loss, frictional loss, and minor losses. DETERMINE friction factors for various flow situations using the Moody.
ENTC-303Dr. Alvarado1 FLUID FRICTION AND PRESSURE LOSSES.
Resistance In Fluid Systems
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