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자료유형
학술저널
저자정보
저널정보
한국태양에너지학회 한국태양에너지학회 논문집 한국태양에너지학회 논문집 제28권 제1호
발행연도
2008.2
수록면
9 - 17 (9page)

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An experimental investigation has been carried out to study the effects of different working fluids on the behavior and thermal performance of a bi-directional thermodiode. The thermodiode was made up of two rectangular loops mounted between a collector plate and a radiator plate. Rotatable joints between thehorizontal and inclined segments of the loops enable easy alteration of the direction of heat transfer. The loops and the tank were filled with a working fluid for effective heat transfer when the thermodiode was forwarded biased. Six different working fluids were tested with thermal conductivity values ranging from 0.1 to 0.56 W/m-℃, thermal expansion coefficient values ranging from 1.8 x 10?⁴ to 1.3 x 10?³ K?¹, and kinematic viscosity values ranging from 0.65 x 10?? to 100 x 10?? ㎡/s. Especially, mixtures of Al₂O₃ (30㎚ particle) in deionized water have been tested for the volumetric ratios of 0.01, 0.02, 0.03, 0.1, 0.2%. Each experiment was carried out after the loop was filled with a working fluid for effective heat transfer and the thermodiode was forwarded biased. The solar thermodiode was heated by a radiant heater consisting of 20 halogen lamps that generated a heat flux of about 1000 W/㎡ on the collector surface. Results are given in terms of temperature development in different parts of the loop as heat is delivered from its hot end to the surrounding atmosphere by the radiator made of copper plates.

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Abstract
1. 서론
2. 실험장치 및 방법
3. 실험 결과
4. 결론
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