• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1542-1547
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• 2003

This paper represents the solar collector performance with type of an evacuate double glass, and a copper tube was installed in center of collector to get a solar thermal energy. The one module of solar collector and artificial sun were used in this experiment The distance between artificial sun and solar collector was fixed at 0.5m, and this experimental condition was focused on winter season. The experiments were carried out. three times for getting a accurate data and the heat amount of one module evacuate d solar collector was estimated at out. 48 kcal/hr.

• 한국기계가공학회지
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• 제10권6호
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• pp.122-127
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• 2011

In this study, it was compared collecting performance according to contact types between heatpipe and manifold of vacuum tube type solar collector. Between two types, direct contact type is better in collecting performance. On the other hand, Indirect type have advantage in maintenance. In the result of numerical analysis, As the temperature of heatpipe and flow rate of working fluid increased, difference of outlet mean temperature of two types became large. Also, it could be confirmed, as contact resistance between heatpipe and copper tube in indirect type increased, the difference increased too. Useful data in selection and design in vacuum tube type solar collector were proposed by the results of numerical analysis.

• Applied Biological Chemistry
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• 제26권2호
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• pp.75-81
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• 1983

태양열(太陽熱) 축열장치(蓄熱裝置)의 개발(開發)을 위(爲)한 기초자료(基礎資料)를 얻기 위(爲)하여 태양열(太陽熱)의 축열매체(蓄熱媒體)로 돌을 이용(利用)한 평판집열기(平板集熱器)을 제작(製作)하여 집열기(集熱器)의 효율(效率), 총열전달계수(總熱傳達係數), 집열기(集熱器)에 의(依)한 상승온도등(上昇溫度等)을 분석(分析)하고 이를 열원(熱源)으로 벼와 고추에 대(對)한 건조실험(乾燥實驗)을 하였다. 초기함수율(初期含水率) 24.5%인 벼를 14.5%까지 건조(乾燥)시키는데 상온통풍건조(常溫通風乾燥)에서는 약(約) 18일(18日), 튜브형집열기(型集熱器)에서 약(約) 12일(12日), 평판집열기(平板集熱器)에서 약(約) 10일(10日)이 소요(所要)되었으며 통고추 건조(乾燥)의 경우 일광건조(日光乾燥)에서 약(約) 68시간(68時間), 튜브형집열기(型集熱器)에서 약(約) 38시간(38時間), 평판집열기(平板集熱器)에서 약(約) 36시간(36時間)이 소요(所要)되었다. 고추를 절단(切斷)하여 건조(乾燥)할 경우 수평(水平)으로 절단(切斷)하는 것이 효과적(效果的)이었으며 건조(乾燥) 과정중(過程中) capsanthine과 capsaicine성분(成分)의 변화(變化)는 건조방법(乾燥方法)이나 절단방법(切斷方法)에 따라 고추의 품질(品質)에 영향(影響)을 미치는 정도(程度)는 아니라고 사료(思料)되었다.

• 대한설비공학회지:설비저널
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• 제37권12호
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• pp.48-53
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• 2008

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2001년도 추계학술발표대회 개요집
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• pp.217-219
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• 2001

• 한국태양에너지학회 논문집
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• 제25권2호
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• pp.19-26
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• 2005

Concentric evacuated tube solar energy collector has been interested recently since government has driven to install alternative energy systems in new large building. In this paper, testing of the evacuated tube collector is conducted in outdoor during daytime by transient method. The collector thermal efficiencies are plotted in term of $(T_{in}-T_a)/Ic$, where $T_{in}$ is inlet working fluid temperature, $T_a$ is atmospheric temperature and $I_c$ is solar irradiation on the collector surface. The evacuated tube collector efficiency is ranged from 50% to 63% in real outdoor condition. In addition, the total overall heat loss coefficient is found to have an inverse variation to $(T_{in}-T_a)/I_c$ so that the coefficient becomes very high when $(T_{in}-T_a)/I_c$ is small.

• 한국태양에너지학회 논문집
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• 제28권4호
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• pp.50-55
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• 2008

The Storage efficiency of concentric evacuated tube solar collector is tested for one year from January 1st to December 31st under the real sun condition. The testing equipment is operated continuously for three days without cooling the storage tank. Daily storage efficiency is obtained from dividing stored energy in the storage tank by solar insolation on the solar collector for each day. Daily averaged temperature of the storage tank is lowest in January and highest in August. Monthly averaged storage efficiency is also lowest in November and highest in June. Therefore, it can be said that the storage temperature and the storage efficiency are roughly proportional to outdoor temperature. Furthermore, the daily storage efficiency is reversely proportional to $(T_s-T_a)/I_c$ where $T_s$ and $T_a$ are daily averaged storage temperature and outdoor temperature from sunrise to sunset, and $I_c$ is total insolation on the solar collector for a day.

• 대한설비공학회지:설비저널
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• 제13권3호
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• pp.157-167
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• 1984

이 연구는 기존의 평판집열기와 그 형상이 다른 Spine fin (침상) tube 태양열집열기를 제작 사용하여 이론과 실험을 통해 그 성능과 열전달 특성을 규명하고 다른 평판집열기와 비교하의로써 Spine fin tube집열기의 적용가능성을 제시하였다. 또한 이 집열기의 최적 사용조건과 그 설계인자들이 제시되었다.

• 한국태양에너지학회 논문집
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• 제36권4호
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• pp.49-56
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• 2016

The objective of this work is to analyze the variation in energy performance for each flat plate collector connected in series. In this study, it was assumed that solar water heating system with annual solar fraction of 60% was installed in an office building in Seoul, South Korea. The transient energy performance corresponding to four cases, which are selected using different solar radiation and outdoor air temperature, is studied by analyzing the variation in outlet temperature, solar useful heat gain, and thermal efficiency of each collector. It is observed that the useful heat gain and the collector efficiency decrease continuously, and outlet temperature increases when increasing the number of collector connected in series. The long-term performance is assessed by evaluating the thermal efficiency of each collector for two solar radiation conditions ranging from 780 to $820W/m^2$ and from 380 to $420W/m^2$. It is found that the differences between the intercept and slope of the efficiency curves for first and eighth collectors are 3.68% and 6.74% for solar radiation of $800{\pm}20W/m^2$ and 8.57% and 12.90% for solar radiation of $400{\pm}20W/m^2$, respectively. In addition, it is interesting to note that annual useful heat gain and collector efficiency are reduced with similar rate of about 6.13% when increasing the collector area by connecting the collectors in series.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.182-185
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• 2008

The thermal performance of air receiver with a change of flow direction for dish solar collector. This system is installed and operated in Incheon, Korea. The thermal capacity of the system is about 5 kW thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 mm, and the height is 210 mm. Experiments are being carried out to investigate the thermal performance variation of the receivers with several design parameters such as the shape of the receiver, the flow directions and the flow rate of air. First, air flows into the upper part of the receiver, which is the opposite side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 3 exits which are located near the aperture. Second, air flows into the backside of the receiver, Which is the forward side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 1 exit. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases as expected.