Precision AirConvey Internal Duct Cleaning System December 10, 2007 Sean Darras Nick Rakov Katie...
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Transcript of Precision AirConvey Internal Duct Cleaning System December 10, 2007 Sean Darras Nick Rakov Katie...
Precision AirConveyPrecision AirConveyInternal Duct Cleaning SystemInternal Duct Cleaning System
December 10, 2007Sean DarrasNick RakovKatie SearLindsay Martz
Introduction to Introduction to PACPAC
PAC has designed a pneumatic linen-refuse system.
Mock SystemMock System
Project ScopeProject Scope
UD must develop a method to clean PAC’s Linen and Refuse Removal System
An inhibitor and deodorizer application must be developed
System System Specifications/ConstraintsSpecifications/Constraints
Duct Dimensions:◦ Outside Diameter: 20”◦ Thickness: Corners .135”,
Straightaway .105” Access panels are 40-100 ft
apart Pressure drop is 50 lbf/in2
Air flow is 55 ft/s ~ 60 mph Duct is made of (uncoated)
steel Plaque is caused by
liquid/debris in the system Most ‘Plaque’ builds up on
the turns Bag path can include a
double 90 degree turn System cleaned weekly
Design CriteriaDesign CriteriaWant Metric Target Value
Maximize Cleaning Performance
Plaque removal 80-100% removed
Durability # of uses or total miles traveled
3 to 5 runs without decreased performance
Minimize Time Time to clean one mile
1 hour
Maximize Range
Distance traveled at one time
1 mile
Minimal Labor Involvement
# of operators 2 in-house maintenance men
Inhibit and Deodorize
Quarterly Swab Test Dependent on Industry
Pre-existing SolutionsPre-existing Solutions
Customer Opinion:◦No Umbilicals ◦Requires Aggressive Cleaning◦Prefer Robot and Shuttle
ideas
Agitation Devices Robots
PIG
Concept IdeasConcept Ideas
Shuttle SpringSpinner Rocket
Spider
Rating Criteria:1: Should surpass target value0.5: Should easily reach target value0.2: Will probably reach target value0: Unknown
MetricImportance
(%) Rocket Spider Shuttle Spinner Spring
Plaque Removal 30 1 1 0.2 0.2 1
Durability 25 1 0.2 0.5 0.5 0.2
Distance Traveled 14 1 1 1 1 0.5
Time 14 1 1 1 1 0.5
Liquid Coverage 11 0 0 0 0.2 0
# of Operators 6 1 1 1 1 0.5
Final Score % 89 69 52.5 54.7 52
Chosen Concept: RocketChosen Concept: Rocket
Initial Concept Final Prototype
In the DuctIn the Duct
Clearance between shuttle and inside duct walls approx = 2 inches
Shuttle length greater than 20 in. to prevent yaw and pitch in the tube
Rocket- How it worksRocket- How it works
Propelled by system
Aluminum Frame
Rotated by system
Nylon Bristles
BrushesBrushesStiff Nylon Fibers
Channel is attached by brackets to main body
Channel Brushes
RotorRotor
Variable fin pitch
Variable number of fins
Liquid ApplicationLiquid ApplicationPrewash and Deodorizer
Sponge◦ Approximately 7 lbs (dry)◦ Dimensions:
Height 21” Diameter 19.8”
Fogger
Sponge
PrototypingPrototyping
Fabrication outsourced
to local Machine Shop
UD provided assembly instructions, detailed drawings, and fabrication support.
Objectives of TestingObjectives of Testing
Determine:◦Durability◦Time to clean one mile◦Distance that can be traveled at one
time◦Coverage of the prewash, inhibitor and
deodorizer◦Cleaning technique that maximizes
plaque removal
Maximum Cleaning Maximum Cleaning PerformancePerformance
Flat-Sheet Prewash TestFlat-Sheet Prewash Test
Surface # of swipes
Greased Lightening 6409 10ZEP 9Dry 20+Air Chalk 3
Sponge TestingSponge TestingBEFORE AFTER
Rotation TestingRotation Testing
Rotation TestingRotation Testing
36 degrees over 12 ft= ~1 Rotation per 120 ft
8 fins at 45 deg. gives maximum rotation
Final Verification TestingFinal Verification Testing
-Results agree with Flat-Sheet Prewash Test
90 Degree Rise
ConclusionsConclusions
•Rocket needs to Rotate One Rotation/Foot
•Current Rocket only rotates ~1 Rotation per 120 ft
•With no rotation, Rocket would need 54 levels of brushes
Recommended ProposalRecommended Proposal
Compromise:◦Double the amount of brushes
◦Requires1/2 rotation/foot◦Increase rotor diameter ◦Optimize fin design◦Clean more often
Total Cost to PACTotal Cost to PAC Material Amount Price
Body
5052 Aluminum Sheet- 1/8" 10 sq ft
$2455 (Includes Labor)
5052 Aluminum Sheet- 1/16" 10 sq ft
Propeller
5052 Aluminum Sheet- 1/8" 1 sq ft
3/8" x 3/8" 12 ftBrushes 2 Sets of Brushes
$746.88100 Brackets
Fogger Flex-a-lite 2600 $300
Sponge 2 Sponges $120Filet Knife $30
Plaque Materials Soda, Eggs, Milk, Fake Snow, Air Chalk $25Participation Cost One time fee $5000
PAC’s Time Varies per employee $4,230*Total $13,906.88
*Best estimate
Questions?Questions?
Supporting Material-RotorSupporting Material-Rotor