Adaptive Textile Technology with Adaptive Cooling and Heating - - PowerPoint PPT Presentation

Lead PI: Professor Joseph Wang Co-PIs: Prof. Renkun Chen, Prof. Sungho Jin,

• Prof. Shirley Meng, Prof. Sheng Xu, Dr. Chulmin Choi and Irena Ilcheva

ARPA-E (DELTA) - DE-AR0000535 (May 1, 2015 – April 30, 2018)

DELTA Program Review, Raleigh, NC Janurary 17th & 18th, 2017

Adaptive Textile Technology with Adaptive Cooling and Heating (ATTACH)

ATTACH – A Unique Temper erature R e Respon

• nsi

sive T e Technology

Goal: To develop an innovative and cost-effective personnel thermal management strategy by utilizing self- adaptive, temperature- or humidity-responsive shape-memory material with tunable thermal resistance, along with integrated flexible thermoelectric (TE) modules for active on-demand heating and cooling. Benefits: Comfort with minimal power consumption and at least 4°F offset in HVAC setpoint in either direction resulting in more than 15% energy savings in building HVAC systems and 2% saving in domestic energy usage and GHG emissions if widely implemented.

Passi ssive S Shape-Mem emory S Structures es & & Active F Flexible S Suppor

• rt

Value: Our project integrates several innovative components (based on advanced responsive materials) into a flexible wearable system, for replacing the traditional cooling and heating (of the entire room space) with a localized cooling/heating on a wearable textile structure close to the person’s skin. Passive Shape-Memory Structures

• Thickness-changeable fabrics
• Flap-openable fabrics
• Responsive to temperature,

humidity, or both

• Self-adaptive to environment
• Tunable thermal resistance
• No power consumption

Active Electronic and Thermoelectric Devices

• Responsive and rapid for

targeted heating or cooling

• Bulk thermoelectric, ZT>1
• Flexible & breathable matrix
• At least 8hr operation
• Light-weight & high-capacity
• Flexible control circuitry

Integrated Solution

Res esul ults: T Tem emper perature Adap e Adaptive e Textile e [Pas assive] e]

Temperature Responsive

• On cooling, fabric

gets thicker. On heating fabric gets thinner.

• ΔT of 10°C induces

the insert material (a star structure) to change thickness by ~2 cm.

• Independent of

humidity level.

• 2 mm change in

air gap allows ~4°C worth of energy savings. 1cm 1cm Humidity Responsive

• Humidity near the

skin rises when a person begins to sweat.

• Relative humidity
• f 70% opens flaps

2 cm within 100s.

• Apparent

temperature (accounts for humidity effect) dropped by 4°C within 60s.

• May be combined

with temperature response.

Ambient T TAT only TAT+TEC TAT TAT+TEC ① ② Skin T

Tchange(deg F)

Time (sec)

Results: s: Flexible T e Thermoel elec ectric C Control [ [Active]

Flexible and Breathable Power Pack

• Batteries, TEC, and other

circuitry required to be compliant as apparels are subjected to many cycles of bending motion during service.

• Size and volume fraction of

pores, as well as the connectivity of pores (for air breathability) depend

• n the synthesis materials

& processing.

• Multiple-cell pack with

~80 g total weight and ~1600 mAh total capacity for 8 hr operation of TEC. Flexible and Breathable Thermo-Electric Component

• Optimum configuration of

passive and active components has been simulated to show a synergistic heating/cooling effect.

• Small temperature

variations: Passive portion can regulate body temperature sufficiently on its own.

• Large temperature

variations: Passive and active components work together to maintain body comfort.

The UC San Diego/Nano SD team has accomplished both passive and active textiles that can regulate human body temperature and save building energy. In Passive Textiles, 3 types of thermal adaptation have been demonstrated.

• i. Thickness-changeable dual pane fabrics, with thickness change reaching 2 cm expansion (for decreasing

temperature) or contraction (for increasing temperature). Equivalent ∆T effect of well over 4°C obtained passively.

• ii. Flap-openable textiles with temperature-only activation (independent of humidity level) developed with the flap-
• pen height change in the centimeter regime.
• iii. Humidity-responsive flap openable textiles with ∆T effect of well over 4°C obtained passively.

In Active Textiles, thermoelectric cooler (TEC) devices with battery power pack designed for applications in which portions of apparel are constrained or the passive temperature control effect is saturated.

• Mechanically compliant and air breathable matrix demonstrated, using clever circuit configurations and engineering
• f matrix layer materials.
• A combined (TEC + TAT) structure modeled and experimentally under construction, with a proper stacking sequence

identified. Individually, the benefits of the passive and active portions of the textile have been validated and the combined synergy

• f the two systems has been simulated. Within the next 4 months (through Q8), the integrated package will be

demonstrated as well. Tech-to-Market activity is being vigorously pursued for rapid commercial applications of these technologies.

Summa mmary

How Can D Can DELTA A & AR ARPA-E H E Help?

TIMELY COMMERCIALIZATION AND MARKETING We are taking an aggressive Tech-to-Market approach and looking to accelerate the development of our system, and to align our technology closely with the market needs (to ensure that it is compatible with common textile fabrics and daily activity). Interested in:

• Sponsor company/companies for ongoing research/commercialization and tech

transfer.

• Additional resources to support and speed integration and commercialization of the

technology within NanoSD.

• Additional market possibilities for passive, active, or combined systems.