Abstract ▼

□ Purpose
■ The purpose is to study the heat flow of highly efficient electrocaloric cooling effect by collaboration between Korea and China.
(1) Prof. Ma Rujun at Nankai University will investigate electrocaloric cooling effect.
(2) Prof. Baik Seunghyun at Sungkyunkwan University will inve

□ Purpose
■ The purpose is to study the heat flow of highly efficient electrocaloric cooling effect by collaboration between Korea and China.
(1) Prof. Ma Rujun at Nankai University will investigate electrocaloric cooling effect.
(2) Prof. Baik Seunghyun at Sungkyunkwan University will investigate heat flow applicable to the electrocarolic phenomenon.
(3) The heat flow of highly efficient electrocaloric cooling effect will be investigated by the collaboration between Prof. Ma Rujun and Prof. Baik Seunghyun.

□ Contents
■ Electrocaloric cooling effect investigation
Electrocaloric cooling effect is based on the reversible heat exchange of dielectric materials. Prof. Ma Rujun at Nankai university investigates the electrocaloric effect using ferroelectric terpolymer, P(VDF-TrFE-CFE). This material is appropriate for solid state cooling device since it is flexible and lightweight. The P(VDF-TrFE-CFE) film is fabricated by the blade-coating method. The carbon nanotube film is also coated on the P(VDF-TrFE-CFE) film.
■ Heat flow investigation
Electrocaloric cooling cycle includes the heat dissipation to the surrounding environment and heat absorption to the material. Prof. Baik Seunghyun at Sungkyunkwan University investigates the heat dissipation and heat absorption process. The heat transfer process is investigated using thermocouples and infrared camera. The optimization of the heat transfer process to the electrocarolic material will also be investigated.
■ Electrocaloric cooling effect heat flow investigation
The heat dissipation and absorption process will be investigated for the application on the electrocaloric material. The control of the electrocaloric cooling cycle will also be investigated. This method is useful for the cooling of electronic devices and bio-applications since there is no compression cycle or vibration.

□ Results
■ Prof. Ma Rujun at Nankai university investigated the synthesis of electrocaloric material (P(VDF-TrFE-CFE)) and electrocaloric cooling effect.
■ Prof. Baik Seunghyun at Sungkyunkwan University investigated the heat dissipation and heat absorption process control. The asymmetric heat transfer is realized by nonlinear thermal radiation. The asymmetry in thermal conductivity and thermal emissivity is generated by sputtering a thin metal film (Nb, Cu, or Ag) on the top right half of a PET ribbon. The experimentally measured temperature profile is in excellent agreement with the finite element analysis. The heat transfer asymmetry of the PET-Nb specimen is confirmed, and the dominant mechanism is nonlinear thermal radiation. The efficiency of electrocaloric material can be increased if this asymmetric heat transfer material is attached on the surface of electrocaloric material.

□ Expected Contribution
■ This method is useful for the cooling of electronic devices and bio-applications since there is no compression cycle or vibration.
■ Our mechanism enables delicate control of heat transfer in a wide range of temperatures and device sizes. This direction-dependent heat transfer can be applied to the electrocaloric materials to increase efficiency.

(source : Summary 4p)

목차 Contents

• 표지 ... 1
• 목차 ... 2
• 국문 요약문 ... 3
• SUMMARY ... 4
• 연구내용 및 결과 ... 5
• 1. 과제 개요 ... 5
• 2. 수행내용 및 결과 ... 5
• 3. 자체평가 ... 9
• 4. 연구결과의 활용 계획 ... 9
• 5. 연구과정에서 수집한 해외 정보 ... 10
• 6. 참고문헌 ... 10
• 7. 연구성과 ... 10
• 8. 기타사항 ... 12
• 끝페이지 ... 12