156B Week 3

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

• Built and verified thermal resistance testing apparatus.

• Completed hot side testing.

• Decided on which Peltier devices to buy, and bought them.

• Designed cold side test.

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

• Cold side test.

  • • Manufacture cold side tube apparatus - Vlad

    • Run tests to obtain thermal resistance values. - Tyler, Vlad, Edgar

    • Calculate pressure drop and decide on pump. - Jocelyne

• Copper plate test. - Tyler

• Design Peltier validation test - Edgar

• Redesign jet water block.

  • Work on Ansys analysis - Josh, Jocelyne

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

Zoom - 01/15/2021

• The sponsor suggested that it might be a good idea to reach out to Dr. Chen, a professor on campus developing TEC devices. Dr. Suarez mentioned that he had previously met with Dr. Chen but that few TEC devices were manufactured.

  • • We will reach out to Dr. Chen and ask about his project updates.

• The sponsor suggested only purchasing two of the expensive TECs for now

  • • We purchased two for the initial prototype test & will use the TECs we have on hand

• Several suggestions were made for the final prototype. Dr. Saurez approved the use of mesh to hold the tubing in place. He suggested that the tubing should be relatively dense and only be concentrated on the torso. He mentioned that we could use an existing vest and to keep in mind that users will likely be wearing a T-shirt underneath the cooling vest.

  • • Our design will incorporate all this feedback.

    • We will arrange the pickup of the vest

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

Zoom - 01/14/2021

• Mentioned that we should look into log mean temperature difference plots.

  • • Still looking into the topic and how it ties into flow rate.

• Asked about water tightness of water block.

  • • Currently using sealant between the copper block and water block, and no leaks in test apparatus, which has more points of failure than the final system will.

• Asked about mass manufacturability of water blocks if we use jet design.

  • • Still looking into other potential designs for water blocks to achieve highest performance.

    • Current design is being used more to prove the concept that water jets will improve performance.

    • Working on splitting the current block into 3 pieces that can be manufactured with traditional methods.

Comments from Other Students in the Class

• No technical comments at the moment.

Risks and Areas of Concern

• Cold side thermal resistance.

  • • We will be testing this next week, if it's too high, we will have to use more tubes, and run the peltier devices less efficiently.

    • Jet water block performance.

      • Our current blocks have adequate performance, but if we want better performance and a lower weight on the system, we have to improve the water jet geometry, and so we will be running an ansys analysis to optimize performance.

Resources or Information Required but not Available

• None

Schedule

• • Milestones

    • • Complete cold side testing

  • Updated Gantt chart link

    • • Screenshot of the most recent updates included below

Budget

• Peltier Devices (2) $235.80

• Amount Remaining: $1267.51

Progress on Report and Webpage

• Completed

  • background

  • market solutions

  • deliverables

  • constraints and requirements

  • component analysis

• Need to complete

  • Impact on society