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태양열 이용 비프레온계 $CF_3CH_2F$(R-134a)적용 열펌프시스템에 의한 학교교실 난방에 관한 연구(II)
선경호,정현채,김기선,Sun, Kyung-Ho,Jung, Hyun-Chai,Kim, Ki-Sun 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.2
본 연구는 R-12($CF_2Cl_2F$) 대체냉매인 R-134a($CF_3CH_2F$) 적용 태양열 열펌프시스템에 의하여 학교교실($20{\sim}25$평형)이나 학교 화장실($13{\sim}17$평형)의 난방에 관한 것으로서 대체냉매 적용할 때 시스템의 안정성과 성능에 관해 실험되어졌다. 학교교실 난방을 위한 방법 중에서 온풍난방을 택하여 실험하였는데 대체냉매 적용 실제와 모형시스템의 난방성능을 비교 해석하였다. 이 결과를 근거로 R-22($CHClF_2$)와 그 대체냉매들에 대한 성능을 예측하였다. 서울지방 봄 가을철, 겨울철의 외기 온도에서 실내온도가 $18{\sim}20^{\circ}C,\;23{\sim}25^{\circ}C$로 유지할 수 있도록 설계 제작되었다. The goal of this paper is to measure and compare the performance of solar heat pump for school classroom heating. To accomplish the goal, solar heat pump with alumium roll bond type evaporator and indoor heat exchanger(condenser) was built and fully instrumented with thermocouples and pressure transducers etc. The test results showed that the COP and capacity of R-134a($CF_3CH_2F$) were higher than those of R-12($CF_2Cl_2$). The solar heat pump system for room heating was designed to show the best efficiency that the room temperature make $18{\sim}20^{\circ}C\;and\;23{\sim}25^{\circ}C$ in Seoul during November, December, and January.
최대 비틀림 파 발생을 위한 자기변형 패치 형상의 위상최적화
선경호(Kyung Ho Sun),조승현(Seung Hyun Cho),김윤영(Yoon Young Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This research is concerned with the topology design optimization of a magnetostrictive patch with the consideration of the coupling between magnetic field and mechanical deformation. Earlier investigations consider the optimization of magnetic systems only. Because the maximization of the torsional wave generated by the patch is to be achieved, the shear stress at the target location of the test specimen where the patch is bonded is used as the objective function. Therefore, not only the patch shape but also patch bonding status must be simultaneously solved in the present problem. This requires the use of two design variables at every finite element discretizing a given design space. The numerical results obtained by the present investigation were found to agree well with the earlier experimental results.
남부지역의 태양열이용 열펌프식 온수.난방시스템의 실증연구 분석
선경호(Sun, Kyung Ho),김기선(Kim, Ki Sun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
The goal of this study is to measure and compare the performance of solar heat pump for room and hot water heating. To accomplish the goal, solar heat pump with alumium roll bond type evaporator and indoor heat exchanger(condenser) was built and fully instrumented with thermocouples and pressure transducers etc. The test results showed that the COP(coefficient of performance) of HFC-134a(CF₃CH₂F) were higher than those of CFC-12(CF₂Cl₂). One stratospherically safe new refrigerant is 1,1,1,2-tetrafluoroethane(HFC-134a), which is thermodynamically similar to CFC-12 and considered to be a potential direct replacement for CFC-12 in air-conditioning and refrigeration applications. The solar heat pump system for room heating was designed to show the best efficiency that the room temperature make 18{sim}20?C and 23{sim}25?C in the southern part of South Korea during November, December, and January.
태양열 이용 열펌프 시스템에 의한 태양열 연구실 난방에 관한 연구 (Ⅰ)
선경호(Kyung-ho Sun),정현채(Hyun-chai Jung) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.3
약 6평 규모의 실내의 온수 순환 난방에 적용될 수 있는 최적 설계조건 하에 제작 설치된 신개발 태양열 시스템의 열적 성능과 실내의 난방효과를 분석한 결과, 신개발 태양열 시스템의 온수순환 난방 방법이 실내난방에 가능함을 확인했다. 본 실험에서 사용된 신개발 태양열 난방시스템은 서울지방 가을철(10월과 11월)의 외기온도에서 실내온도가 18℃~20℃로 되는 범위내에서 최대의 효율을 나타내도록 설계하였다. A study discovered the possibility that new solar hot water circulating method make the room heat. A study proved the best conditions to use hot water circulating system in the room that is about 20㎡, The new system is designed to show the best efficiency that the room temperature make l8~20℃ in Seoul during November and December.
[001] 및 [011] 방향 분극의 압전 단결정 PMN-PZT 를 이용한 진동 에너지 수확 특성
선경호(Kyung Ho Sun),김영철(Young-Cheol Kim),김재은(Jae Eun Kim) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
This work investigated the electromechanical performance of a cantilevered vibration energy harvester incorporating the single crystal PMN-PZT, manufactured with the most recent technology of solid-state single crystal growth. Single crystal PMN-PZTs with two different crystallographic axes such as [011] and [001] were considered. For the [011] orientation, because material properties such as the stiffness, piezoelectric strain coefficients are not the same in the directions normal to the crystallographic axis, the effects of the transversely anisotropy on the magnitude and frequency bandwidth of output power were also analyzed.