1321639 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種集熱裝置，且特別是有關於一種 可提高集熱效率之複合弧形曲面聚光集熱器。 【先前技術】 一般吸收太陽能以供再利用的集熱設備，大致可分為 低溫、中溫、高溫三種。 低溫集熱器，係透過金屬或非金屬集熱板提供攝氏80 °C以下溫度。 中溫集熱器，則提供攝氏80°C以上之溫度，通常為攝 氏 80°C 〜150°C。 高溫集熱器，則是操作在攝氏150°C以上之溫度。 在外國，太陽能的應用大部份是採高溫型發電用。其 中，一種拋物線槽體型聚光集熱器（parabolic trough concentrator, PTC)，是目前應用於高溫發電之各類集熱器 中技術最成熟的一種。例如：美國LUX公司在南加州 Mojave Desert所建造之SEGS系統具有單軸追日裝置，操 作溫度在攝氏300°C〜400°C，是採用媒油為主要的工作流 體，再與水作熱交換，進而產生蒸汽，以推動傳統渦輪引 擎發電。 然而，一座拋物槽線體型集熱器，最符合經濟成本的 裝置容量大約在300MW左右。美國LUX公司自西元1958 年至西元1991年，在南加州先後建造九座高溫發電系統， 5 1321639 與加州愛迪生電力公司電網相連，以提供約345MW的電 功率’約佔全世界太陽能發電裝置的9〇%。 由SEGS系統之運轉經驗顯示，運轉及維護保費約佔 發電成本的25% ’為該型發電系統的最大生存挑戰。而後 期所製造的發電系統，年效率在1〇%〜14%，發電成本約 每度電0.08〜0.14美元，維護保養成本約每度電〇〇2美元。 中溫集熱器在應用上’中國大陸在山東省乳山市建立 太陽能空調示範系統，利用非聚光式熱管真空管太陽能集 熱器，其正常工作出水溫度可達攝氏88r，此類型太陽能 集熱器與目前市場上通用的溴化鋰吸收式製冷設備結合 組成太陽能空調系統。 此外，在台灣，亦有一種中溫平板式太陽能集熱器， 此集熱器是採用非聚光式雙層玻璃隔熱，以選擇性吸收 面，性能只比非聚光式真空管集熱器稍差，實測之溫升也 可達到攝氏88°C。 以上系統其集熱溫度過低，造成所應用系統效率不高 為其缺點》 據上可知，聚光式集熱器目的在提高照射在集熱板上 之太陽輻射能量密度，利用一反射面聚光，將太陽入射之 能量密度增強數倍，在聚焦處放一集熱裝置，可提高操作 溫度並減小熱損（因集熱面積較小>早年集光（聚光）技術較 不成熟，反射面製作昂貴，成本偏高。近年來，由於量產 技術以及材料發展突飛猛進，聚光技術日趨成熟，成本大 為降低。一般開發中或已商品化之中溫集熱器均屬非聚光 型或簡易(非正確)聚光型，其吸收太陽熱能後所產生之严 升均在攝氏m：以下，若絲使用在熱㈣式之太陽能^ 調系統或工業製程預熱，則會造成系統效率不高的缺點。 此外，為應付不同季節之偏斜太陽入射角，愛爾蘭 (Ireland)的Tapas K. Mallick等人在太陽光電發電之太陽光 電板上有作成非對稱之複合拋物面（asymmetrie⑺叫嶋d parabolic concentrator)，但此非對稱之複合拋物面其曲面 精準度要求較高'製造成本較高且曲面也無法作到省材料 與聚光效率最佳化（因要適應各季太陽入射角其各季之效 率則互相牽制不能提到最高），因此，有必要再尋求解決之 道0 【發明内容】 因此本發明的目的就是在提供一種複合弧形曲面聚 光集熱裝置’此裝置由吸熱板與兩個聚光反射板及一駐光 板組構成一截面呈對稱雙U型的複合弧形聚光集熱槽 (CAC，Compound Arc Concentrator ’ 如第 2 圖），其在吸熱 板中垂立設置駐光單元，使此CAC裝置不受曰光照射方向 影響’部份無法聚光而外漏之光線皆能被駐光板截獲並吸 收集熱’使聚光率增加，以提高整體之吸熱效果。 根據本發明之上述目的與優點’提出一種低成本、製 造與安裝均較容易之創新複合弧形曲面聚光集熱裝置，包 含一吸熱板、二弧形聚光反射板、一駐光板以及一選擇吸 收膜。 該吸熱板，包含一吸熱板本體以及一集熱管部’該集 熱管部係位於該吸熱板本體的中央處。 該等弧形聚光反射板，對稱接設在該等吸熱板本體兩 側’該等弧形聚光反射板與吸熱板界定出一集光空間。 該駐光板’直立接設於該吸熱板之集熱管部的上方， 該駐光板與該等弧形聚光反射板之間分別界定出一吸熱 空間。 該選擇吸收膜，被覆於該駐光板之外表面以及該吸熱 板本體與該集熱管部的外表面，此選擇吸收膜對太陽光具 有高吸收特性。 本發明基於在吸熱板中間垂立設有駐光板，可因應季 節改變導致曰光方位不定時，藉由駐光板截獲外漏光線並 吸收集熱，以增進整體之集熱效率。 【實施方式】 參照第1圖’本發明之複合弧形曲面聚光集熱裝置， 包含一吸熱板100、二弧形聚光反射板200、一駐光板300, 以及一選擇吸收膜400。 參照第1圖與第2圖，該吸熱板1〇〇，為高導熱材質 製成’具有高光吸收性。該吸熱板100包含一吸熱板本體 110以及一集熱管部120。該集熱管部120為半圓形，並且 凸出於該吸熱板本體110的外表面。 該等弧形聚光反射板200為高反射率的材質所製成， 且在聚光面上有做防氧化之處理，使可保持具有長期高反 射率的聚光目的與功用。該等弧形聚光反射板200對稱接 設在該等吸熱板本體110兩側。該等弧形聚光反射板200 與吸熱板100界定出一集光空間500。 該駐光板300，直立接設於該吸熱板1〇〇之集熱管部 120的頂部，該駐光板3〇〇與該等弧形聚光反射板2〇〇之 間分別界定出一吸熱空間501。 該選擇吸收膜400，被覆於該駐光板3〇〇之外表面以 及該吸熱板本體110與該集熱管部12〇的外表面，此選擇 吸收膜對太陽光具有高吸收特性。 在使用狀態，是將該吸熱板1〇〇之集熱管部120貼設 在一導管600上’依據不同的工作項目，可在導管6〇〇内 填入有水（water)或媒油（kerosene)等之工作液體601 » 參照第3圖，此外，將該吸熱板本體11 〇設成水平狀， 再將一圓管狀的集熱管部120係銜接在該吸熱板本體no 底部，而此時的駐光板300呈L型銜接於該吸熱板本體11〇 的中央，並位於集熱管部120上方，如此亦可達到上述相 同功效，不再贅述。 參照第4圖，另外，該吸熱板100的集熱管部120亦 可採以中空圓管態樣，以供直接充填工作液體601。 參照第5圖，當光線射入該集光空間500，光線先投 射在該等弧形聚光反射板200上，再藉由該等聚光反射板 200作光線反射作用，將光線呈多角度折射而集中投射在 該吸熱板本體110以及該駐光板300，使吸熱空間501蓄 存高熱，而該吸熱板本體及駐光板再藉由其表面之選擇吸 收膜400截獲並吸收集熱，以獲致更高效率的集熱效果。 因此，本發明採用導熱係數極高的金屬材質所製成的吸熱 板100,不但可提高聚光集熱效用，更藉由駐光板300截 獲外漏光線並吸收集熱，使集熱效果更加倍增。 本發明之集熱裝置在增設駐光板之使用，可使本發明 具有下列功效及優點： 一 '減少聚光反射板製造難度或精度：由於駐光板有 輔助聚光功能，可截獲入射光線經過聚光反射板後無法被 聚光而即將外漏者，因此聚光反射板可由傳統較精密複雜 之拋物曲面改良成為具有一曲率半徑之簡單派形曲面，以 減少聚光反射板製造難度或精度、降低製造及安裝成本。 二、減少聚光反射板200材料：只要增加駐光板300 之長度’駐光板300輔助聚光反射板2〇〇聚光所截獲之光 線將愈多’因此聚光反射板200之垂直高度可下降，此可 降低較高價位之聚光反射板200材料，以降低材料成本。 參照第6圖’此駐光板300長度與聚光反射板200垂直高 度之關係成反比、為二次（含）以上之多項式曲線’到達五 次多項式時為最準確，其多項式曲線型式為 y = +以+ /，且隨著此聚光裝置所在緯 度（latitude)的提高（或偏離地球赤道愈多），第6圖之駐光 板咼度曲線方程式將往上移且曲線之曲率將逐漸變小（或 曲線愈彎曲）。 二、減輕集熱裝置整體重量及製造成本：聚光反射板 200之垂直高度可下降，以減少整個集熱裝置的體積（厚度 1321639 下降）’可減輕集熱裝置重量及製造成本β 四、 一年四季均具有高聚光集熱效率：參照第7圖、 第8圖與第9圖，增加駐光板3〇〇可截獲因李節變化時， 太陽從各方向入射所致聚光裝置外漏之光線，使一年四季 之聚光集熱效率提高且均等（見第1〇圖）。 五、 不須追日機構降低成本：參照第1〇圖，增加駐 光板300 —年四季之聚光集熱效率提高，因此不須追曰機 構’具有低成本與中（或高）溫高性能之優點。 綜上所述，相較於現有中溫集熱器的集熱效率，充其 量只能達到攝氏9(TC以下之缺憾；本發明該實施例藉由駐 光板300以及辅以選擇吸收膜4〇〇之集熱作用，可獲得高 集熱效果，以及藉以低成本的設計，可得到更高經濟效益 的熱源再利用’而且’此駐光板300可吸收多角度折射光 線的效果，不受季節性之日光照射方向影響，如第5圖、 第7圖、第8圖與第9圖所示’無論從那個角度照射，皆 能經由駐光板300截獲外漏光線並吸收集熱，以改善因季 節性變化而產生集熱效果變差的問題，故本發明可提高集 熱效果’所以適合用在太陽能空調系統之熱源集熱裝置與 工業製程預熱裝置上’具有低成本高集熱功用，而且模組 化的設置可供方便裝卸；再加上複合弧形曲面聚光器（CAC) 之優越聚光性能，使聚光集熱的效率可超過攝氏1〇〇。匸以 上’因此可提商現有中溫集熱器的集熱效率。並且具有高 性能、模組化、保溫效果佳以及低成本等優越的應用性能。 值得一提的是’本發明中的駐光板300可將製造成本 11 較高之對稱或非對稱複合拋物面改成為較低成本之簡單 弧形（Arc)曲面，不但能作到省材料與聚光效率最佳化，且 可省去為提高各季節效率之追日機構約3〇%的成本（含設 備成本20%與維修成本丨〇%)。 雖然本發明已以一實施例揭露如上，然其並非用以限 疋本發明，任何熟習此技藝者，在不脫離本發明之精神和 範圍内，當可作各種之更動與潤飾，因此本發明之保護範 圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 月匕更明顯易懂’所附圖式之詳細說明如下： 第1圖係為本發明一實施例的複合弧形曲面聚光集熱 裝置的立體圖。 、… 第2圖係為該實施例的剖視圖。 第3圖係相類似於第2圖的剖視圖，說明該吸熱板之 第一種態樣。 第4圖係為吸熱板之第三種態樣的剖視圖。 第5圖係為該實施例之光線投射的分佈示意圖。 第6圖係為駐光板與反射板垂直高度的曲線圖表。 第7圖係為該實施例於北緯24度位置冬季之太陽天 1321639 頂角（zenith angle)50度的光線折射分佈示意圖。 第8圖係為該實施例於北緯24度位置春秋季之太陽 天頂角25度的光線折射分佈示意圖。 第9圖係為該實施例於北緯24度位置夏季之太陽 頂角〇度的光線折射分佈示意圖。 第10圖係為本發明於北緯24度位置一年四查沾也 十巧杲光 率的數值表。 【主要元件符號說明】 100 :吸熱板 120 =集熱管部 300 :駐光板 5〇〇 :集光空間 600 :導管 110 :吸熱板本體 200 :弧形聚光反射板 4〇〇 :選擇吸收膜 501 :吸熱空間 :工作液髏 131321639 IX. Description of the Invention: [Technical Field] The present invention relates to a heat collecting device, and more particularly to a composite curved curved collecting light collector capable of improving heat collecting efficiency. [Prior Art] A heat collecting device that generally absorbs solar energy for reuse can be roughly classified into three types: low temperature, medium temperature, and high temperature. Low-temperature collectors provide temperatures below 80 °C through metal or non-metal collectors. Medium temperature collectors provide temperatures above 80 ° C, typically 80 ° C to 150 ° C. High temperature collectors operate at temperatures above 150 °C. In foreign countries, most of the solar energy applications are used for high-temperature power generation. Among them, a parabolic trough concentrator (PTC) is the most mature technology in various types of collectors for high-temperature power generation. For example, the SEGS system built by LUX Company in Mojave Desert, Southern California has a single-axis tracking device with an operating temperature of 300 ° C to 400 ° C. It uses medium oil as the main working fluid and then exchanges heat with water. In turn, steam is generated to drive the traditional turbine engine to generate electricity. However, a parabolic trough-type collector has the most economical cost of about 300 MW. LUX Company of the United States from nine years from 1958 to 1991, built nine high-temperature power generation systems in Southern California, 5 1321639 connected with the California Edison Power Company grid to provide about 345MW of electric power 'about 9% of the world's solar power plants %. Operating experience with the SEGS system shows that operating and maintenance premiums account for approximately 25% of the cost of power generation' as the biggest survival challenge for this type of power generation system. In the later generation, the power generation system has an annual efficiency of 1% to 14%, the power generation cost is about 0.08 to 0.14 US dollars per kilowatt hour, and the maintenance cost is about 2 US dollars per kilowatt hour. In the application of medium-temperature collectors, 'China's solar air-conditioning demonstration system in Rushan City, Shandong Province, using non-concentrating heat pipe vacuum tube solar collectors, its normal working water temperature can reach 88r Celsius, this type of solar collector It is combined with the lithium bromide absorption refrigeration equipment currently available on the market to form a solar air conditioning system. In addition, in Taiwan, there is also a medium-temperature flat-plate solar collector, which uses non-concentrating double-glazed insulation to selectively absorb surfaces, and performance is only better than non-concentrating vacuum tube collectors. Slightly poor, the measured temperature rise can also reach 88 ° C. In the above system, the heat collection temperature is too low, resulting in low efficiency of the applied system. It is known that the purpose of the concentrating collector is to increase the solar radiation energy density on the heat collecting plate, and use a reflective surface to gather Light, the energy density of the sun is increased by several times, and a heat collecting device is placed at the focus to increase the operating temperature and reduce the heat loss (since the heat collecting area is smaller); the early gathering (concentrating) technology is less mature The reflective surface is expensive to manufacture and the cost is high. In recent years, due to the rapid development of mass production technology and materials, the concentrating technology has become more mature and the cost has been greatly reduced. The general development or commercialized intermediate temperature collectors are non-polymerized. Light type or simple (non-correct) concentrating type, which absorbs the solar heat energy and produces a sharp rise of less than or equal to m:, if the wire is used in a hot (four) type solar energy system or industrial process preheating, it will cause In addition, in order to cope with the skewed solar incident angle in different seasons, Ireland's Tapas K. Mallick et al. have made asymmetric on the solar photovoltaic panel of solar photovoltaic power generation. Compound paraboloid (asymmetrie (7) is called parad parabolic concentrator), but this asymmetric composite paraboloid has higher surface accuracy requirements. 'The manufacturing cost is higher and the surface can not be optimized for the material and concentrating efficiency (due to adapt to each The solar solar incident angle is not related to the highest efficiency in each season. Therefore, it is necessary to seek a solution. [Inventive] Therefore, the object of the present invention is to provide a composite curved curved surface collecting and collecting device The device is composed of a heat absorbing plate, two concentrating reflectors and a glazing panel to form a symmetrical double U-shaped composite arc concentrating heat collecting trough (CAC, Compound Arc Concentrator ' as shown in Fig. 2), which absorbs heat. The illuminating unit is arranged vertically in the plate, so that the CAC device is not affected by the direction of the illuminating light. 'Some of the light that cannot be condensed and the external leakage can be intercepted by the illuminating plate and absorb the heat collecting' increases the concentrating rate to improve The overall heat absorption effect. According to the above objects and advantages of the present invention, an innovative composite curved curved surface concentrating heat collecting device with low cost, easy manufacture and installation is proposed. The heat absorbing plate comprises a heat absorbing plate body and a heat collecting tube portion. The heat collecting tube portion is located at a center of the heat absorbing plate body. The arc-shaped concentrating reflectors are symmetrically connected to the two sides of the heat absorbing plate body. The arc concentrating reflectors and the heat absorbing plate define a light collecting space. The illuminating plate is erected to the heat absorbing body. Above the heat collecting tube portion of the plate, a heat absorbing space is defined between the light absorbing plate and the curved concentrating reflecting plates. The selective absorbing film is coated on the outer surface of the light absorbing plate and the heat absorbing plate body and the set The outer surface of the heat pipe portion, the selective absorption film has high absorption characteristics for sunlight. The invention is based on the fact that a light-retaining plate is vertically arranged in the middle of the heat-absorbing plate, which can cause the calendering direction to be irregular according to the season change, and the leakage is intercepted by the light-retaining plate. The light absorbs heat and enhances the overall heat collection efficiency. [Embodiment] Referring to Figure 1 of the present invention, a composite curved curved surface concentrating heat collecting device comprises a heat absorbing plate 100, a two-arc shaped concentrating reflecting plate 200, a luminescent plate 300, and a selective absorbing film 400. Referring to Figures 1 and 2, the heat absorbing plate 1 is made of a highly thermally conductive material and has high light absorption. The heat absorbing plate 100 includes a heat absorbing plate body 110 and a heat collecting tube portion 120. The heat collecting tube portion 120 is semicircular and protrudes from the outer surface of the heat absorbing plate body 110. The arc-shaped concentrating reflectors 200 are made of a material having high reflectivity, and are treated on the concentrating surface to prevent oxidation, so that the purpose and function of concentrating light having a long-term high reflectance can be maintained. The arc-shaped concentrating reflectors 200 are symmetrically connected to both sides of the heat absorbing plate body 110. The curved concentrating reflector 200 and the heat absorbing plate 100 define a concentrating space 500. The light-receiving plate 300 is erected on the top of the heat collecting tube portion 120 of the heat absorbing plate 1 , and a heat absorbing space 501 is defined between the light-receiving plate 3 and the curved concentrating reflector 2 . The selective absorption film 400 is coated on the outer surface of the light-retaining plate 3 and the outer surface of the heat-absorbing plate main body 110 and the heat-collecting tube portion 12, and the selective absorption film has high absorption characteristics for sunlight. In the state of use, the heat collecting tube portion 120 of the heat absorbing plate 1 is attached to a conduit 600. According to different work items, water or medium oil (kerosene) can be filled in the conduit 6〇〇. Working liquid 601 » Referring to Fig. 3, in addition, the heat absorbing plate body 11 is horizontally arranged, and a circular tubular heat collecting tube portion 120 is coupled to the bottom of the heat absorbing plate body no. The light plate 300 is connected to the center of the heat absorbing plate body 11 in an L shape, and is located above the heat collecting tube portion 120, so that the same effects can be achieved, and details are not described herein. Referring to Fig. 4, in addition, the heat collecting tube portion 120 of the heat absorbing plate 100 may also adopt a hollow circular tube shape for directly filling the working liquid 601. Referring to FIG. 5, when light is incident on the concentrating space 500, the light is first projected on the curved concentrating reflector 200, and the concentrating reflector 200 is used for light reflection to make the light at multiple angles. Refraction and concentrated projection on the heat absorbing plate body 110 and the light absorbing plate 300, so that the heat absorbing space 501 stores high heat, and the heat absorbing plate body and the light absorbing plate are further intercepted by the selective absorbing film 400 on the surface thereof and absorb heat. More efficient heat collection. Therefore, the heat absorbing plate 100 made of the metal material with extremely high thermal conductivity can not only improve the concentrating and collecting heat effect, but also intercept the external light leakage and absorb the heat collecting by the illuminating plate 300, so that the heat collecting effect is further multiplied. . The use of the heat collecting device of the present invention in the addition of the light-retaining plate enables the present invention to have the following functions and advantages: 1. Reduce the difficulty or precision of the concentrating reflector: Since the illuminating plate has an auxiliary concentrating function, the incident light can be intercepted. After the light reflection plate can not be condensed and is leaking out, the concentrating reflection plate can be modified from a conventional more sophisticated parabolic surface into a simple pie-shaped surface having a radius of curvature to reduce the difficulty or precision of the concentrating reflector. Reduce manufacturing and installation costs. 2. Reducing the material of the concentrating reflector 200: as long as the length of the glazing plate 300 is increased, the more light intercepted by the concentrating reflector 2 concentrating the illuminating reflector 2, the more the light is intercepted, so the vertical height of the concentrating reflector 200 can be lowered. This can reduce the material of the concentrating reflector 200 at a higher price to reduce the material cost. Referring to Fig. 6, the relationship between the length of the light-retaining plate 300 and the vertical height of the concentrating reflector 200 is inversely proportional, and the polynomial curve of the second (inclusive) or more is the most accurate when it reaches the fifth-order polynomial, and the polynomial curve type is y = + with + /, and as the latitude of the concentrating device increases (or deviates from the Earth's equator), the equation of the plate temperature curve of Figure 6 will move up and the curvature of the curve will gradually decrease. (or the curve is more curved). 2. Reducing the overall weight and manufacturing cost of the heat collecting device: the vertical height of the concentrating reflector 200 can be lowered to reduce the volume of the entire heat collecting device (the thickness is reduced by 1321639), which can reduce the weight of the heat collecting device and the manufacturing cost. High concentrating and collecting efficiency in all seasons: Refer to Figure 7, Figure 8, and Figure 9. Adding the light-storing plate 3〇〇 can intercept the light leaking from the concentrating device caused by the sun entering from all directions due to the change of the Li Festival. The collection and collection efficiency of the collection is improved and equal throughout the year (see Figure 1). V. No need to chase the Japanese institutions to reduce costs: Refer to the first map to increase the concentrating heat collection efficiency of the glazing plate 300 - the four seasons of the year, so there is no need to track the organization's low cost and medium (or high) temperature and high performance. advantage. In summary, compared with the heat collecting efficiency of the existing medium temperature collector, it can only reach a defect of 9% or less at TC; this embodiment of the present invention is provided by the light-retaining plate 300 and the selective absorbing film 4 Collecting heat, high heat collection effect, and low cost design, can obtain more economical heat source reuse 'and' the light plate 300 can absorb the effect of multi-angle refracted light, free from seasonal sunlight The influence of the illumination direction, as shown in Fig. 5, Fig. 7, Fig. 8 and Fig. 9 'While the illumination from that angle, the external leakage light can be intercepted through the illuminating plate 300 and the heat collection can be absorbed to improve the seasonal variation. However, the heat collecting effect is deteriorated, so the present invention can improve the heat collecting effect. Therefore, it is suitable for use in a heat source heat collecting device and an industrial process preheating device of a solar air conditioning system, and has a low cost and high heat collecting function, and the module The setting is convenient for loading and unloading; coupled with the superior concentrating performance of the composite curved surface concentrator (CAC), the efficiency of concentrating heat collection can exceed 1 摄 Celsius. The collector's heat collecting efficiency has superior performances such as high performance, modularity, good thermal insulation effect and low cost. It is worth mentioning that 'the illuminating plate 300 of the present invention can make the manufacturing cost 11 higher symmetry. Or the asymmetric compound paraboloid is changed to a lower cost simple arc (Arc) surface, which not only optimizes the material and concentrating efficiency, but also saves the Japanese chasing mechanism for improving the efficiency of each season. % of the cost (including equipment cost 20% and maintenance cost 丨〇%). Although the invention has been disclosed above by way of an embodiment, it is not intended to limit the invention, and those skilled in the art, without departing from the invention The scope of protection of the present invention is defined by the scope of the appended claims. The above and other objects of the present invention, The features, advantages, and embodiments of the present invention are more clearly understood. The detailed description of the drawings is as follows: FIG. 1 is a perspective view of a composite curved curved surface collecting and collecting device according to an embodiment of the present invention. A cross-sectional view of the embodiment. Fig. 3 is a cross-sectional view similar to Fig. 2, illustrating a first aspect of the heat absorbing plate. Fig. 4 is a cross-sectional view showing a third aspect of the heat absorbing plate. The distribution diagram of the ray projection of this embodiment is shown in Fig. 6. Fig. 6 is a graph showing the vertical height of the glazing plate and the reflecting plate. Fig. 7 is the zenith angle of the solar day in the winter latitude of the embodiment at 24 degrees north latitude (zenith) Angle) Schematic diagram of the light refraction distribution of 50 degrees. Fig. 8 is a schematic diagram of the light refraction distribution of the solar zenith angle of 25 degrees north latitude in the north latitude of the embodiment. Fig. 9 is the summer latitude of the embodiment at 24 degrees north latitude. Schematic diagram of the light refraction distribution of the solar apex angle. Fig. 10 is a numerical table of the present invention in the north latitude of 24 degrees. [Description of main component symbols] 100: heat absorbing plate 120 = heat collecting pipe portion 300: light absorbing plate 5: concentrating space 600: duct 110: heat absorbing plate body 200: curved concentrating reflecting plate 4: selecting absorbing film 501 : Heat absorption space: working fluid 髅 13