156B Week 4

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

• • Magnetic stirring mechanism: Distance, pole positions, strength tested, adapter to mate magnet to motor machined

  • Temperature of water in brewing container is currently 85 degrees C. Conducting taste test tomorrow to determine if this is okay for steeping tea

  • We are conducting design and analysis for several paths for if 85 degrees is insufficient. Afterwards, we will determine which path(s) will be necessary to pursue

    • Increase height of water travel from water heater to brewing container

    • Heat brewing container separately

    • Heat water container separately

    • Heat tube that water travels up

    • Increase the power of the water heater

  • Need to integrate gate valve and metal brewing container, with filter

Accomplishments from Previous Week

• • Parts for magnetic stirring purchased and/or machined

• Rotational speeds for mixing and for reducing boilover

• Obtained vertical gate valve and metal brewing container, this is a more robust design with better thermal properties as well

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

• • Design or find a heating plate that is not attracted to magnets or that can easily be machined (Arun)

• Determine the optimal material for the stirrer (steel or magnetic rod) as well as the optimal length (Ian)

• Determine if 85 degrees is enough to steep tea, and if not, which path(s) for additional water heating to pursue (Shahin)

• Design integration of vertical gate valve, filter and brewing container (Soo)

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

• • Instead of boiling at 80 degrees Celsius, try to increase the temperature to 90~100 (Sat, Jan 23 in person)

    • reroute the water flow so it travels a longer distance inside the heating tube

  • Look into cutting a hole through the hot plate (Sat, Jan 23 in person)

    • heating mechanism in rice cookers

    • Non-magnetic heating plate material

• Make more room for the filter in the water boiler (Sat, Jan 23 in person)

  • moving the valve mechanism to the bottom of the brewing container

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

• • Trying to find national standards to make sure all our products are okay for consumer use (Mon, Jan 18 in person)

    • http://ulstandards.ul.com/standard/?id=197_10

      • UL standards are not available through UCSD

    • Looking through UCSD library's available standards

  • Ensured that product will not draw more amps than available from wall outlet (Mon, Jan 18 in person)

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

• • Comments from last presentation

    • separate container for water at boiling temp before adding to tea - Armando Armijo (From Design proporal presentations on Tue, Jan 12 via notes)

    • consider mechanical stirrers (like ones in hard contact lens solution) - Salman Alrashed (From Design proporal presentations on Tue, Jan 12 via notes)

Risks and Areas of Concern

Resources or Information Required but not Available

Schedule

Budget (list amount spent and amount remaining)

• • $1000 total

  • Spent: $135

Progress on Report and Webpage

• • Finished Impact on Society of report

  • Webpage is undergoing