Fans Section 1

0
0
1897 days ago, 679 views
PowerPoint PPT Presentation
Dwyer Manometer Guide. AMCA Fan Curve Guide. BAE2023. 2. Dr. C. L. Jones. Biosystems and Ag. ... Turbomachines: change vitality level of streaming liquid by method for energy ...

Presentation Transcript

Slide 1

Fans Part 1 Reading: Chapter 5 in Henderson/Perry Greenheck Product Application Guide Dwyer Manometer Guide AMCA Fan Curve Guide Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 2

Pumps, Fans, Compressors- - Turbomachines: change vitality level of streaming liquid by method for energy trade Wide spread in ALL enterprises Power units: autos/trucks, tractors Computers Grain lifts Oilfield Medical offices Food handling And… … . Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 3

Pumps, Fans, Compressors—Turbomachines (Review) Differences between pumps, fans, compressors Pumps: move fluids Fans: move gasses with little increment in weight Compressors: move gasses with more noteworthy increment in weight Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 4

Fan Standards ASHRAE : A merican S ociety of H eating, R efrigeration, and An ir molding E ngineering… research and guidelines AMCA : An ir M ovement and C ontrol A ssociation… measures Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 5

Fan Operation Fans cause weight increment by: Centrifugal constrain made by pivot of the section of air caught between two cutting edges Kinetic vitality is provided to the air through the impeller Total weight = speed head + static weight Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 6

Selection Considerations Quantity of air to be moved per unit time Estimated framework resistance and expected varieties Amount of clamor allowed Space accessible for fan Economic ramifications Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 7

Fan Classification Designated as dynamic pumps Centrifugal Further characterization by section and exit of liquid/gas through impeller 4 streamlined arrangements: Axial stream Radial stream : alluded to as "radiating fan" Cross stream Mixed stream Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 8

Axial-stream Fans Propeller Tube-Axial Vane-Axial Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 9

Propeller Fans Used in numerous horticultural ventilation applications with free conveyance or low weight conditions Propeller has a pitch (turn). Separation of air travel relies on upon pitch and # of cutting edges Warping the sharp edges counteracts reverse of air (page 121) Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 10

Tube-Axial Fans Wheel or impeller inside a tube Blades are twisted for proficiency Operates at higher weights and higher ME than propeller fans Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 11

Vane-Axial Fans Like a tube hub with guide vanes before or after the impeller Higher weights and efficiencies ( up to 2200 psi and 85% +) on the grounds that… Vanes coordinate wind stream through a progressive turn until distracting speed part is killed Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 12

Centrifugal Fans Consists of wheel or rotor inside a winding lodging Air makes a 90 degree turn Forward-bended tip Backward-bended tip Straight or outspread tip Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 13

Straight or Radial-Tip Fans 6 – 20 sharp edges Blades are 2 to 3 x the length of they are wide Larger lodging, more costly Can deal with filthy air and higher weights Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 14

Backward-Curved-Tip Fans Approx. 12 sharp edges Flat and tilted in reverse High speed fan with self-constraining force If measured effectively, engine won't overheat if conditions change (bend pg. 132) Most productive Cannot deal with filthy air Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 15

Forward-Curved-Tip Fans Up to 60 sharp edges Narrow radially however wide parallel to shaft Face forward in heading of revolution, scoop Low-speed, direct weights, can be shaky Clean air just Lowest noise!!!!! Utilized as a part of numerous heater blowers Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 16

Cross-Flow (or Tangential) Fans Uniform release, high air rate Use in broilers, baseboard radiators, unit warmers, drying gear, kitchen hoods Larger lodging, more costly Can deal with filthy air and higher weights Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 17

Mixed-Flow Fans Aka In-line or Tubular Centrifugal fans Combines elements of divergent and vane-pivotal fans Straight-through wind current yet execution qualities of radial Quiet like outward Used as fumes fans in homes, business and horticultural Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 18

Performance Tested at shutoff and free conveyance conditions Shutoff: release is blanked off Free conveyance: outlet resistance is 0 Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 19

Fan Curves Manufacturer gives fan bend Predicts the weight stream rate execution of every fan Choose fan as per volumetric stream rate for your framework weight drop Choose fan with pinnacle proficiency at or close to your working point Sometimes producers utilize tables rather (Greenheck Handout) Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 20

Fan Curves Fans take after the liking laws (ASHRAE) Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 21

Fan Law Example Fan speed N changes from 600 to 650 rpm for an enthusiast of a given size Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 22

Fan Curves If we know static weight and outlet zone, we can discover add up to weight: Total weight incorporates static and speed weight If we know control, static productivity, or aggregate effectiveness, the others can be ascertained: Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 23

Sound Power Levels Energy move Sound In dB: W 0 = 1 x 10 - 12 Watts W = control (W) For extra units, see eqtn. 5.6 (H/P) Sones: One sone speaks to the din of a 1 kHz tone at 40 dB SPL. Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

Slide 24

More Fans… Fans in parallel: moves bend to one side… weight continues through to the end, stream rate is the whole Fans in arrangement: moves bend up… stream rate keeps with it, weight is the aggregate Dr. C. L. Jones Biosystems and Ag. Engineering BAE2023

SPONSORS