156B Week 5

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• Received mesh vest

• Assembled and Tested Prototype 1

  • Tested using bench power supply and open fan setup

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• Design Backpack Mounting - Josh

• Do Log Mean Temperature Difference - Jocelyne, Josh

• Design Control System - Vlad

• Finalize tube routing - Tyler, Edgar

• Complete Ansys Simulations - Jocelyne

• Test System With 2 Peltiers - Tyler, Edgar, Vlad

  • • Measure power draw

    • Test in a high temperature environment

    • Measure flow rate

• Choose battery - All

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

Zoom - 01/29/2021

• Sponsor was impressed with current progress, we mentioned we pushed back battery purchase until prototype testing is finished

  • • Sponsor agreed - we plan to purchase by next week

• Sponsor concerned with possible pressure drop through vest tubing

  • • Tested water flow and achieved consistent flow through all tubing

• Sponsor asked about chosen horizontal configuration for tubing

  • • Sponsor mentioned that vertical layout would allow for easier expansion for different body types

      • • We mentioned that might pose an issue for the placement of the tube manifolds

        • Our solution is to allow for a kink within a few inches of the front center of the vest to expand horizontally for different sizes

• Sponsor asked about plans for a stress test

  • • We mentioned that we would like to try using a facility on campus, such as a sauna, where we could set a high temperature

      • • Sponsor agreed to reach out to facilities to see if it's possible

    • In the meantime, we plan to perform a stress test at one of our apartments (using in home heating and space heater)

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

Zoom - 01/28/2021

• Instructor was concerned about the flow of water in the system. He advised measuring the flow rate by using a reservoir.

  • • The tests that we have performed up until now show that the flow rate does not drop significantly. However, we will perform a formal test with a reservoir next week.

• It was suggested that we learn about log mean temperature difference.

  • • After this meeting Professor Tustaniwskyj sent us some information. We have reviewed this material and we will make the necessary adjustments to our calculations.

• Professor suggested that we contact the Peltier device manufacturer and ask if it is waterproof.

  • • We have reached out to the manufacturer.

• Professor Tustaniwskyj told us to be mindful and consistent about units.

  • • When performing calculations and before we submit anything we will ensure that we are using proper, metric units.

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• No technical comments at the moment.

Risks and Areas of Concern

• App Integration

  • • Thinking of a temporary solution for now

Resources or Information Required but not Available

• None

Schedule

• • Upcoming milestones

    • • Completed a proof-of-concept, qualitative test using one TEC

      • Will integrate 2 TECs and perform a full system test & record skin temperature

  • Updated Gantt chart link

    • • Screenshot of the most recent updates included below

Budget (list amount spent and amount remaining)

• Tubing $49.50

• 3D Printing Resin $43.09

• 1/4 Barb Fittings, Low Pressure gauge $65.31

• Buck Converter $11.84

• 5/16 Barb Fittings $10.76

• Potentiometers $29.13

• 40 mm Ceramic Heater $26.30

• Nitrile Gloves $32.85

• Plastic Tube Splitter $12.89

• Amount Remaining: $ $933.73

Progress on Report and Webpage

• We are on track to have a draft of the report by Friday.

• The webpage is up to date. Only internal sections filled per our sponsor's request.