태양열을 이용한 무동력 냉난방 겸용장치의 특성 비교 연구

Study on Characteristics Comparison of Unpowered Cooling and Heating Combined Device using Solar Heat

Abstract

지구온난화 현상이 세계적으로 점점 심각해지고 있으며 이에 대한 대책으로 에너지 원천의 다양화, 에너지 절감 기술 등이 필요하다. 본 연구에서는 태양열을 이용한 무동력 냉난방 겸용장치를 실현하기 위하여 태양열 집열기 흡수판의 재질변화, 무동력과 최소의 동력을 사용하였을 때의 특성을 비교하고자 하였다. 그 결과로서 하절기에 태양열 집열장치를 부착한 경우는 부착하지 않은 경우보다 실내온도가 약 $1^{\circ}C$ 낮았으며, 하절기에 냉원저장조가 없는 상태에서 태양열 집열장치에 의한 냉방효과는 적었다. 그러나 동절기에는 실내온도가 약 $3^{\circ}C$ 높았으며 무동력에 의한 난방효과의 가능성이 있었다. 간접적인 측정방법에 의해, Cu 재질의 태양열 집열장치의 성능은 Al 재질과 비교하여 약 2배 높았다.

As the global warming due to greenhouse effect has become serious problem, it is necessary to introduce the technology, for instance, such as diversity or saving of energy to reduce the use of fossil fuel. The purpose of this study was to investigate the characteristics on materials of absorption plate, unpowered and minimum use of power in cooling and heating combined device. As the results, it was observed that, in case of summer, since temperature of absorption device of solar heat(ADSH) was lower than that of no ADSH, cooling effect was insignificant in case of being not installed cold-reservoir. However, in case of winter, heating effect was certified even though the power was not used. At secondhand, the performance of ADSH with Cu was higher 2 times than that of ADSH with Al.

Fig. 1. Principle of absorption device of solar heat (ADSH) in case of summer[8].

Fig. 2. Principle of absorption device of solar heat (ADSH) in case of winter[8].

Fig. 3. Set-up of ADSH using Al and Cu.

Fig. 4. Experimental house fixed ADSH[8].

Fig. 5. Location of measurement.

Fig. 6. Temperature distribution in case of summer(8/4, Al, no fan).

Fig. 7. Temperature distribution in case of summer(8/10, Al, no fan).

Fig. 8. Temperature distribution in case of summer(8/14, Al, fan).

Fig. 9. Variation of inlet velocity.

Fig. 10. Temperature distribution in case of winter (11/10, Cu, no fan).

Fig. 11. Temperature distribution in case of winter (11/20, Cu, fan).

Fig. 12. Comparison for absorption plate of solar heat Al and Cu (no fan).

Table 1. Material properties of Al and Cu.