heating and cooling the human body with wirelessly-powered ... · battery and witricity field...
TRANSCRIPT
1 Center for the Built Environment | October 2016
Heating and cooling the human body with
wirelessly-powered devices
UC Berkeley:
Center for the Built Environment (CBE)
Electrical Engineering and Computer Science (EECS)
WiTricity Corporation
Wasatch Collaboratory
Industry partners:
Dr. Scholl’sStaplesPersonal Comfort Systems
Funding: Advanced Research
Project Agency – Energy (ARPA‐E)
(May 2015 – April 2018)
2 Center for the Built Environment | October 2016
Wirelessly-powered thermal comfort
Goal: Expand the use of personal comfort systems
(PCS) by reducing their need for wired connections
Approach:
Develop systems that flexibly and efficiently
transfer electrical power through magnetic
resonance coupling
• Under-desk transmitter (COP 50-70%)
• Floor mat transmitter (COP 50-80%)
Devise thermally efficient suite of PCS devices:
• Desk fan
• Heated/cooled wrist pad
• CBE heated/cooled chair
• Heated insole
Prove the effectiveness of the PCS through
human subject testing.
Tech to Market activities
The heated insole
3 Center for the Built Environment | October 2016
Preliminary results: presentation outline
Fundamental studies of PCS
• Mapping thermal sensitivity across the body
• Human subject tests of our DELTA devices singly
and in combination
Wirelessly powering DELTA
• Heated insole
• Heated/cooled chair
4 Center for the Built Environment | October 2016
The sensitivity to warming and cooling also varies
across the body’s skin surface
Local spots measured with a heated and cooled
probe
Body parts tested: hand, foot, back, neck, forearm
Sensitivity scale: 0 (no feeling) to 10 (very strong)
Number of subjects: 10 females, 10 males
Where to locate heating and cooling spots?
Palm thermal sensitivity test points
Body part Number of measurement points
hand 49
foot 55
back 18
neck 14
forearm 28
5 Center for the Built Environment | October 2016
FEM
ALE
Warm sensation Cold sensation
FEM
ALE
TS (
a.u
.)
TS (
a.u
.)
Warm/cool sensitivity maps of hands and feet
FEM
ALE
FEM
ALE
6 Center for the Built Environment | October 2016
FEMALE
Warm sensation Cold sensation
TS (
a.u
.)
TS (
a.u
.)
FEMALE
Warm/cool sensitivity maps of back and neck
7 Center for the Built Environment | October 2016
Heated insole and itstemperature control
Heated/cooled wristpad Heated/cooled chair
8 Center for the Built Environment | October 2016
Human subject tests under cool conditions
10 females, 10 males
Test condition: 64F (our cool condition target), 40% RH
Heated insole, wristpad, chair
Clothing: T-shirt + long-sleeve shirt, long pants, short socks
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Chamber setup
10 Center for the Built Environment | October 2016
Thermal comfort questionnaire
• Whole-body
• Local body parts: hand, forearm, foot, calf, face, seat area
11 Center for the Built Environment | October 2016
Skin temperature measurement sites (10 sites)
1
3 4
2
6
Body parts Weight
cheek 0.07
arm 0.19
chest 0.175
back 0.175
leg 0.39
Calculate body mean skin temperature
9
5
87
10
12 Center for the Built Environment | October 2016
Results: Acceptance of current thermal environment
-4
-3
-2
-1
0
1
2
3
4 94.1%
Feet+Hands + Chair
Unacceptable
side
Acceptable
side
85.3%85%80%71.1%78.5%
Hands + Chair
Feet + Chair
Feet + Hands
Hands
Feet
Reference Case
62.5%
Acceptance of current thermal environment
Neutral
13 Center for the Built Environment | October 2016
WiTricityelectronics
EECS electronics+ a battery
Receiver coil
3D print
Development of wirelessly powered heated insole
Model orthotic insole
14 Center for the Built Environment | October 2016
DELTA control Board
Shared control board for DELTA
devices:
insole, desk fan, wrist heater/fan
Power management:
LiPo battery charging circuitry
5V boost circuit for output
Seamless switching between
battery and WiTricity field
Monitoring:
Temperature sensor
Accelerometer
On-board ADCs for battery voltage,
WiTricity coupling
Operation:
Atmel SAM R21E Cortex M0+ MCU
integrated 802.15.4 radio
Running RIOT-OS
Small form factor: 40mm x 52mm x 6.15mm
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Wireless transmitter and receiver coils for insoles
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Wireless transmitter and receiver coils for the chair
Source Coil and Electronics Receive Coil and Electronics
17 Center for the Built Environment | October 2016
18 Center for the Built Environment | October 2016
Summary
Warm/cool sensitivity maps guide local heating/cooling
design
UC Berkeley 4 DELTA devices provide comfort from 64
– 84 degrees F
Wirelessly powered heated insole, heated/cooled
wristpad and chairs have been developed
COP: insole and chair reached targets
Active planning for T2M
19 Center for the Built Environment | October 2016
Challenges
Locate a company to lead the marketing of the entire system
What is the business model to sell the diverse DELTA system components in
the workplace:
• Center on wireless power transfer
• Center on workstation furniture company
• Role of sub-contractors like insole and fan manufactures
Assist lead company with relevant technical information, performance
specifications, demonstrations
20 Center for the Built Environment | October 2016
How the DELTA community can help our project: T2M effort
Locate companies interested in commercializing and marketing
• the integrated system
• the individual components
If you are interested in our DELTA devices, please contact:
• Jeff Muhs (Wasatch Collaboratory): [email protected]
• Katie Hall (Endeveo Inc.): [email protected]