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Design Review

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by

Daniel Schmid

on 11 April 2010

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Transcript of Design Review

Sponsored by:
Mr. Robert Pearsall, Research Engineer Scientist
Center for Electromechanics
Austin, TX Design of an Algae Photobioreactor Team: CEM-Reactor - Stephen Kunkel, Daniel Schmid, David Townsend Project Background CEM is a research center affiliated with UT Austin

Algae is a promising next generation biofuel

Current PBR design suffers from operational issues

Design Concerns Planned Design Future Action Design Review
utilize airlift

minimize algae settling

uniform sampling mechanism

sufficient growth conditions



minimize cleaning time
Main Body Geometry Selection Flat Panel Cylindrical Multi-tube Pros Cons high light exposure area
lacks expensive tube numerous joints
airlift adverse
unfamiliar operation
settling in corners Cons familiar operation
small number of joints
"off the shelf" part Cone Dome Parabolic Flat -light exposure
-CO2 enriched air exposure
-mixing Reverse Engineering

conducted mind mapping, 6-3-5, and brain writing

decided we needed to select main body geometry first

consulted with CEM
mind map
-accomodate 2 instruments

-adequate venting

-support upriser

-air tight

-prevent contamination

-easily removable develop top plate
develop sealing method
select material for remaining components
design and experiment gas sparger
address budget, consider scaled prototype decomposed product design problem into simpler subproblems

allows product architecture decisions to be made earlier in the development process

provides a method of comparing current vs. new design



Activity Diagram Black Box Model Functional Model Brainstorming low surface area to volume ratio
cleaning time Pros large surface area to volume ratio
anti-settling
"off the shelf" parts
air lift friendly large number of joints
difficult to clean
unfamiliar operation Cons Pros Bottom Cons simple
inexpensive
easily replaced may promote settling
hard to drain
Pros Cons simple
inexpensive
easily replaced
may promote settling
Pros Cons prevents setting
hard to drain
expensive
long lead time
complicates airlift Pros Cons prevents settling
improved draining expensive
difficult to mfg
long lead time
Pros Experimentation Top Sampling Mechanism "Keg Tap" siphon "Shepherd's Crook" hand pump syringe QUESTIONS ? DESIGN REVIEW CEM-REACTOR Project Purpose To improve the operational ease and effectiveness of CEM's current photobioreactor design by seeking innovative solutions to known design flaws. UV resistant clear PVC pipe Harvel EnviroKing Main tube - Harvel EnviroKing ThinWall
12" dia x 5' long
Upriser - Harvel EnviroKing ThinWall
3" dia x 6' long
Main tube flanges - PVC

Cone - 12" dia x 8" tall x 4" dia

Cone flanges - same material as cone

Cone blind flange - no material selected www.harvel.com http://upload.wikimedia.org/wikipedia/commons/0/0d/Siphon_%28PSF%29.png www.cheapbikeparts360.com http://img.tradeindia.com/fp/1/151/545.jpg Requirements Methodology Cleaning Procedure http://www.clamlynch.com/blog/brainstorm.jpg
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