156B Week 9

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

• First Prototype completed

• More polished product is being worked on

  • • Printed packaging

    • Improved tubing layout

    • Finalized Manifolds

    • Potentiometer implemented

Accomplishments from Previous Week

• 2nd vest completed

  • • 1st vest was colder towards the bottom, so we needed to increase the tubing density toward the top

    • Improved the 2nd vest by increasing the tubing density at the top (changed the tubing layout)

• Ansys

  • • Ran simulations with heat exchange models.

      • • Channel water block

        • Jet water block

          • • A water block with 0.83mm diameter openings was chosen

• Printing

  • • Finished printing 5/8 Packaging assemblies

    • Given no print errors, printing is set to be finished by Friday 3/5

• Potentiometer control implemented

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

• Ansys - Jocelyne, Josh

  • • Add expressions to CFD-Post file. We will calculate the Nusselt number, convective coefficient, etc. We will then compare the results of the channel water block to the jet water block.

• Stress Test - Edgar, Tyler, Vlad

  • • We have gotten approval to use the RIMAC sauna, are currently scheduling an appointment

• Design "bladder" to contain air bubbles that get trapped in system - Edgar, Tyler, Vlad

  • • We have added quick connect fittings. When disconnecting we will get some air in the system. Need a place for the air bubbles to go

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

Zoom - 02/26/2021

• Dr. Suarez updated us about testing at a sauna at RIMAC. He told us that he had not heard back from RIMAC and suspects that they might have not replied because RIMAC is a mass vaccination site.

  • • Dr. Suarez will re-reach out to RIMAC

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

Zoom - 02/25/2021

• Professor asked about the potentiometer that will be used to control water temperature

  • • The potentiometer being used required a screwdriver to set temperature. The new potentiometer will allow the wearer to change the water temperature by turning a knob.

• We mentioned that the tests were performed in a loft with 95°C ambient temperature. The Professor asked about our testing location.

  • • The test was performed in a loft. The apartment's heat was turned up and an additional space heater was used. The temperature in the room was steady.

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

Zoom - 02/25/2021

• A classmate asked us about the weight of the entire system

  • • The weight of the system is about 5kg (11lb).

Risks and Areas of Concern

• No significant risk

Resources or Information Required but not Available

• None

Schedule

• • Upcoming milestone

    • • Will complete a fully portable system test under high temperature conditions

        • • Sauna test - currently scheduling a date w/ RIMAC

  • Updated Gantt chart link

    • • Screenshot of the most recent updates included below

Budget (list amount spent and amount remaining)

• Neoprene vest $15

• Quick connect fittings $45.64

• Amount Remaining: -$24.87

Progress on Report and Webpage

• Currently updating and filling out sections of report and website.