Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Fabricated new bags (single bag/anti-static window, double layered bag anti-static window, Tyvek)
Finalized Controlled test bed with 12 volt powered fan and four pocket weight scales
Conducted water loss testing through continuous weight measurements through rewiring of newly bought weight sensors
New Seal methods (roll top was effective and inexpensive)
Accomplishments from Previous Week
Determined that double-layered silk, anti-static window was the best (water loss)
Did test run with continuous water loss testing with fours bags (double-layered silk, control (silk), single-layered window anti-static bag, double-layered window anti-static bag)
Able to get additional data and graphs on vapor pressure inside and outside of silk bag
Did further mass transfer analysis on new bag water loss tests to model Darcy’s Law
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Albert/Jordan: Get website updated especially the Gantt Chart
Albert: Document closely any small or big comments or suggestions made by instructor or lead sponsor during meetings
Kevin: Design and fabricate more L-shaped Noryl shading structure (4 in total)
Dylan/Christian: Noise performance testing at GroundMetrics
Jordan and Albert: Continuous water loss testing with new bags (4 at a time)
Albert and Dylan: Do any possible additional rewiring and soldering if necessary
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments
Sponsor will help with outside noise testing with new bags vs. the control silk bag
Tyvek bag was too noisy (this bag design is out of question regardless of water loss rate)
Shading structure is a viable prototype, but lacks professional aesthetics appe
Dylan conducted noise tests (double-layered silk and silk bag inside polyethylene (pink) anti-static bag were all acceptable)
We will do more water loss testing with new bags doing more continuous measurements so that results are consistent and sound
Instructor Comments from Last Meeting and Actions Taken to Address these Comments
RTV is a good adhesive to try out to lower water loss as well as Flexible epoxy
Velcro is probably among the biggest factors to water escaping as vapor from the bag
We conducted test between clamped and unclamped ended bags (clamped bags loss less water à Velcro is not a good seal)
Do as much necessary testing that seems reasonable
Conductive silicone RTV is too expensive ($1600 for 10 oz)
Risks and Areas of Concern
• How much consistent and accurate water loss testing results we can get
Placement of the weight scales inside the heated box
• Temperature sensor error readings for pocket weight scales will be hard to diagnose
Resources or Information Required but not Available
Outside noise performance of new bags
Schedule
Do more rigorous controlled water loss testing on new bags
Conduct outside noise testing
Update Gantt chart.
Budget (list amount spent and amount remaining)
Currently, we have only used approximately $621 out of the $1000 so far. $125-150 was set apart in order to fabricate eight copies of the finalized coupling bags.
Progress on Report and Webpage
Update the Gantt Chart
Added diagrams to controlled test bed
Upload Weekly Progress Report
Work on final report and poster