Final Design

Overall Design:

The final design is a wearable device that fits on the forearm and cools the skin with Peltier devices. This device consists of eight temperature stages with a temperature range from 0 to 20C. The cool sides of the Peltier devices are attached to specifically designed surface contacts that touch the skin directly, and the hot sides are cooled off by a closed loop water cooling system. Water is pumped through the closed loop from a reservoir to the water block then back to the reservoir, cooling the Peltier devices attached to the water block. The Peltier devices are temperature and time-controlled by a printed circuit board integrated an Arduino board that utilizes PID control method to reach and keep the Peltier device to the desired temperature. Doctors can see the current working status from a screen and adjust the setting temperature and time by buttons and knobs in the physical user interface box. The power supply to this device is 5 V. Additionally, the Blynk app is used to monitor the temperature controller so doctors can monitor and adjust the temperature easily through their phones.

Major components:

hardware

Peltier Devices

- CUI Devices CP30239H

- Able to maintain 0 degree over 10 minutes

- Compact size: 20mm x 20mm x 3.9mm

- Qmax = 10.3W@27°C so the overall thermal performance is good

Electronic part

Thermistor

- Fit within a hole of diameter 3mm

- Sense temperature between the ranges of -10 - 70 ℃

- measure temperature on the order of milliseconds

Printed circuit board

- Fit into the pins of an Arduino

- Have connection points where the wires from the Peltiers and thermistors can

connect to the PCB

- Large enough to house components

- Water Block
  - - Effectively cool the Peltier devices
    - Water-proofed
    - Properly manage wires from all Peltier devices and thermistors
    - Able to be secured to multiple areas of the human body such as arms and legs

- Power Supply
  - - Mean Well NES-100
  - - provide 20 Amps and 5 Voltage to Peltier plates
  - - Reliably draw power from a wall socket

- Water Reservoir
  - - Satisfied the volume requirement of water
  - - Easily filled and emptied by hand

- Temperature controller
  - - Controls the eight temperature stages independently
  - - Maintain temperatures within ±1°C over 10 minutes
  - - Have a controller box with screens and buttons that can be adjusted manually
  - - Be able to commute with iPhone via Wifi

- Skin Applicator
  - - House the thermistor securely
  - - Come in full contact with skin
  - - Provide most heat transfer between skin and Peltier device
  - - Made of material that will not cause skin reactions in certain patients

- IOS app
  - - Connect Iphone via Wifi
  - - Develop in Blynk platform
  - - Able to adjust temperature and time through phone
  - - Showing the current working status when device working

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