1. Gas Flow Meter Client: John Webster Advisor: Naomi Chesler Project Leader: Anna Moeller Communications: Kailey Feyereisen BSAC: Ryan Drake BWIG: Gina Stuessy Client: John Webster Advisor: Naomi Chesler Project Leader: Anna Moeller Communications: Kailey Feyereisen BSAC: Ryan Drake BWIG: Gina Stuessy

2. Outline  Problem Statement  Background  Motivation  Design Requirements  Designs  Design Matrix  Future Work  Problem Statement  Background  Motivation  Design Requirements  Designs  Design Matrix  Future Work

3. Problem Statement  Design a gas flow meter with continuous or single readout that can be manufactured for less than $2 when produced in quantities of 500.

4. Design Requirements  Continuous readout  4”x4”x1” dimensions  Accurate within 10%  Attached to an O 2, CO 2, or medical air source  Continuous readout  4”x4”x1” dimensions  Accurate within 10%  Attached to an O 2, CO 2, or medical air source

5. Background  Medical gas flow rates up to 15 L/min  Methods of measuring flow rate vary  Changing area  Exerting force  Many disciplines use flow meters  Current Products  Rotameter  Electronic  Venturi  Medical gas flow rates up to 15 L/min  Methods of measuring flow rate vary  Changing area  Exerting force  Many disciplines use flow meters  Current Products  Rotameter  Electronic  Venturi

6. Motivation  Current products are expensive or compromise accuracy  Developing countries need them  Important in monitoring air flow  Health care system would improve  Durability, reliability, and simplicity  Current products are expensive or compromise accuracy  Developing countries need them  Important in monitoring air flow  Health care system would improve  Durability, reliability, and simplicity

7. Drag Force Flow Meter  Acrylic, clear tube  Thin brass metal disk  Air flow proportional to deflection of disk  Acrylic, clear tube  Thin brass metal disk  Air flow proportional to deflection of disk 4” 2”

8. Drag Force Flow Meter: Pros & Cons  Pros:  Simple to use  Inexpensive  Uncomplicated  Easy to manufacture  Pros:  Simple to use  Inexpensive  Uncomplicated  Easy to manufacture  Cons:  Difficult calibration  Reliability of parts  Inaccurate

9. Rotameter  Gas flows through narrow end  Float rises as rate increases  Marks on the side of the tube indicate flow rate

10. Rotameter: Pros & Cons  Pros:  Parts minimal  Reliability  Maintenance Requirements low.  Pros:  Parts minimal  Reliability  Maintenance Requirements low.  Cons:  Gravity dependence  Accuracy  Manufacturing

11. Venturi Tube  Flow rate causes change in pressure  Pressure difference of air on two sides of orifice measured by water  Manometer  Detachable  Calibrated to give an instant reading

12. Venturi: Pros & Cons  Pros:  Parts do not move  Materials inexpensive  Operation is simple  Pros:  Parts do not move  Materials inexpensive  Operation is simple  Cons:  Accuracy and reliability  Difficulty in manufacturing  Cost  Size  Water replacement  Meter must be level

13. Design Matrix DesignCost (1-10) Accuracy (1-5) Size (1-10) Simplicity of Use (1-5) Total (30) Drag Flow Meter 5310321 Rotameter8410527 Venturi Flow Meter 745521

14. Future Work  Determine final design  Order materials  Construct prototype  Test and Calibrate prototype  Determine final design  Order materials  Construct prototype  Test and Calibrate prototype

15. References  www.wikipedia.org  www.engineersedge.com  www.globalspec.com  www.sloanmeterdirectory.com  www.omega.com  www.hyperphysics.com  www.wikipedia.org  www.engineersedge.com  www.globalspec.com  www.sloanmeterdirectory.com  www.omega.com  www.hyperphysics.com

16. Any Questions?