EMAE 260 Detail Design Review

Detail Design Review Dihydrogen Monoxide

1 December 2014

Team ContributionsAll members were involved in planning and concept development, as well as Solidworks, however, each member had a primary area of involvementBrian Weingarth - Team Lead, organized operations, created parts, ensured requirements were metKyle Rogers - Performed research during concept development phase, instrumental in putting together final assemblyBen Ault - Performed research during concept development phase, developed technical aspects of the design, oversaw development of final productKiley Armstrong - Played a major role in development of team documents, created parts, and performed researchDon Endres - Instrumental in conducting research throughout design process, provided guidance in terms of material selection, and assisted in technical calculationsRochelle Hung - Assisted with the development of designs, played a major role in presentation preparationZachary Mufti - Performed research throughout the project, provided financial guidance and ensured budgets were met

Project Statement● To design a portable water desalination unit for

use during emergency situations● Responsible for:

○ Input design○ Housing design

● Not responsible for:○ Desalination Membrane Design○ Filter design

RequirementsCustomer

1. Provide drinkable water from seawater.

2. Portable device.3. Provide enough water for a

family’s survival needs in a 24 hour period.

4. Usable without electricity and/or the need to charge batteries.

5. Easy to clean, operate and durable.

Derived1. Must remove at least 95% of the

salt from standard seawater.2. Fit into a backpack weighing

roughly 25 lbs.3. Must produce at least 4 gallons

of fresh water daily.4. Must be fueled by mechanical

energy only.5. Materials must be strong, easy

to clean, and rust resistant. Must provide instructions for operation.

Design Concept● Overall Dimensions(H x W x D):

40in. x 18in. x 12.5in.● Designed to fit into a custom-fit

backpack for ease of transport

Theory of Operations● User detaches main syringe from

tank to retrieve water● Water is drawn in through a

“Lifestraw” filter as the user extends the handle

● User places the main syringe back into tank insert and pushes water through the reverse osmosis membrane

● Concentrate is collected in the syringe cover, which can be detached to expel contents

● Main syringe can be used to fill up water bottle, pot for cooking, etc.. Being placed in the tank insert is not critical to its functionality

Technical InformationFilmtec SW30-2521

Reverse Osmosis Membrane● Designed to filter salt water● 800 psig = 300 gal/day● Salt Rejection: 99.4%● Recovery Rate: 4%

Lifestraw Filter● Lets you drink directly from

streams and lakes● Removes 99.99% of bacteria,

protazoa, etc.● Reduces muddiness

CalculationsFilterApplied Pressure: 800 psigFlow Rate: 300 gpd

Applied force required to meet 4 gpd requirement:

A = [(pi)/4]*(.75)^2 = 0.4418 in^2800 psig/300 gpd = F/(.4418 in^2)(4 gpd)

F = 4.71 lb applied to obtain 4 gpd

Material: PVCMaximum Stress: 4500 psiMax Applied Force: 500lbFactor of Safety : 2P=F/A4500 psi = (1000lb)/AA = 0.2222inA =(pi/4)[(d+2t)^2 -d^2]4(0.2222)/pi = 4t(d+t)Assuming d = 8inRequired thickness: t = 0.0088in

Make/Buy Decisions

Bill of Materials

Assembly Drawing

Manufacturing Drawing

Material Choices

All Plastic Components:

Polyvinyl Chloride

● Excellent Strength

● Low Density

● High Corrosion

Resistance

● UV Resistant

● Inexpensive

● Safe for drinking water

Rubber Plunger:

Ethylene Propylene

● Good Chemical

Resistance

● Resistant to Corrosion

● Extremely Water

Resistant

● Excellent Wear

Resistance

Manufacturing ProcessesInjection Molding

● PVC: best suitable for three-dimensional structures (ie. sealed containers and large-sized receptacles)

● Ethylene Propylene: best suited for the complex/unique shape of the plunger (process used for plunger in medical syringes)

http://www.vec.gr.jp/english/pvc/process/index.html

Extrusion Molding

● PVC: suitable for production of a pipe by selecting a suitable die, such as the cylindrical compartments of our design

FMEA

Final Cost Estimate● Cost of Materials: $30● Cost of Manufacturing: $50● Osmosis Membrane: $171.04● Filtration Membrane: $19.95● 2 Draw Latches: $32.70● 2 Check Valves: $40.92● 8 Screws: $0.51● Tank Nozzle: $11.76

Total: $356.88

Gantt Chart