CN101788199A - Solar receiver - Google Patents

Solar receiver Download PDF

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Publication number
CN101788199A
CN101788199A CN 201010131736 CN201010131736A CN101788199A CN 101788199 A CN101788199 A CN 101788199A CN 201010131736 CN201010131736 CN 201010131736 CN 201010131736 A CN201010131736 A CN 201010131736A CN 101788199 A CN101788199 A CN 101788199A
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CN
China
Prior art keywords
solar receiver
heat absorbing
working fluid
heat
cavity
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CN 201010131736
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Chinese (zh)
Inventor
张融
项晓东
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益科博能源科技(上海)有限公司
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Priority to CN 201010131736 priority Critical patent/CN101788199A/en
Publication of CN101788199A publication Critical patent/CN101788199A/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy
    • Y02E10/44Heat exchange systems

Abstract

The invention discloses a solar receiver. The solar receiver comprises a heat absorbing pipe combination, wherein the heat absorbing pipe combination is spirally arranged to form a cavity; one end of the cavity is provided with an opening for receiving intensively incident sunlight; one end of the heat absorbing pipe combination is connected with a working fluid inlet pipe while the other end is connected with a working fluid outlet pipe, wherein a heat absorbing pipe consists of a plurality of pipelines with smaller diameters; and the pipelines are connected with the working fluid inlet pipe and the working fluid outlet pipe in a parallel connection way. Therefore, heat exchange efficiency can be improved by improving the flow rate of a working fluid in the pipelines; and blackbody radiation loss of a receiver is further reduced so that heat energy absorbing efficiency is improved.

Description

太阳能接收器 Solar receiver

【技术领域】 TECHNICAL FIELD

[0001] 本发明涉及一种太阳能接收器,属于太阳能热利用技术领域。 [0001] The present invention relates to a solar receiver, belongs to the technical field of solar heat utilization.

【背景技术】 【Background technique】

[0002] 与本发明相关的现有技术可参考美国专利4449514所示,其所揭示的容积式太阳能接收器包括一圆柱形壳体,在该圆柱形壳体的内表面排设有吸热管,该吸热管两端连接工作流体出口管与进口管,而该壳体的一端呈开口设置,以便接收集中的入射光,当被集中的太阳光自该壳体的开口射入后从而加热吸热管内的工作流体,之后被加热的工作流体从出口管流出,用以产生蒸汽或投入至其他应用。 [0002] The prior art related to the present invention may be illustrated with reference to U.S. Patent, it is disclosed volumetric solar receiver comprising a housing 4449514 cylindrical, inner surface of the cylindrical housing is provided with a discharge tube heat absorbing the heat absorbing tube ends connected to the working fluid inlet tube and outlet tube, and one end of the housing was provided an opening for receiving incident light concentration, when the concentrated sunlight is incident from the rear opening of the housing so as to heat working fluid within the heat absorbing tube, after being heated working fluid flows out from the outlet pipe for generating steam or put to other applications. 此种结构虽然可以实现将太阳能转为热能, 但是由于其中的吸热管均为一根并盘旋设置,为确保一定的流量,此吸热管的管径必须设置的大一些,但由于该吸热管被太阳光照射的表面温度较高,而另一侧温度低,管径大时会导致吸热管内流体的加热不均匀,导致流体层流现象,从而不利于提高热交换效率。 Although such a structure can achieve solar energy into heat energy, but due to the heat absorbing pipes which are a set and circled, to ensure a constant flow rate, the diameter of this heat absorbing pipe must be set larger, but due to the absorption the heat pipe is irradiated with sunlight higher surface temperatures, while the other side of the low temperature, heat will cause the fluid within the absorber tube diameter of unevenness is large, resulting in the phenomenon of the fluid flow layer, which is not conducive to improve the heat exchange efficiency. 同时, 如果因系统要求需加大流量时,则必须提高流体的流速,如此远离吸热管被加热表面的流体更加无法被加热,从而导致热交换效率更低。 Meanwhile, if the need to increase the flow rate due to system requirements, it is necessary to increase the flow rate of fluid, such fluid away from the surface of the absorber tube is heated can not be heated more, resulting in a lower heat exchange efficiency. 再者,由于此类太阳能接收器的热损失主要为黑体辐射热损失(黑体辐射热损失与腔体内表面温度与热交换流体的温度之差的四次方成正比),在上述工作流体无法充分换热的情形下,腔体内表面温度与热交换流体的温度之差将很大,如此进一步增加了黑体辐射的热损失,从而降低了系统整体的光能_热能转换效率。 Further, heat loss due to such solar receivers are mainly black-body radiation heat loss (proportional to the fourth power of the temperature difference between the black-body radiation heat loss and surface temperature of the heat exchange fluid within the cavity), at said working fluid is not sufficiently the case of heat transfer, the temperature difference between the fluid cavity and the heat exchange surface temperature will be large, thus further increasing the blackbody radiation heat loss, thereby reducing the overall energy conversion efficiency of the system _ light.

【发明内容】 [SUMMARY]

[0003] 本发明目的在于提供一种太阳能接收器,用以克服现有接收器换热效率及光能_热能转换效率较低的缺陷。 [0003] The object of the present invention to provide a solar receiver, the receiver to overcome the conventional low heat exchange efficiency and energy conversion efficiency of light energy _ defects.

[0004] 为实现上述目的,实施本发明的一种太阳能接收器包括吸热管组合,该吸热管组 [0004] To achieve the above object, an embodiment of the present invention comprises a solar receiver heat absorbing tube assembly, the heat absorbing tube set

合螺旋排布形成一腔体,该腔体一端设有一开口,以接收集中入射的太阳光,而该吸热管组 Together form a spiral arrangement of cavities, the chamber having an opening at one end to receive concentrated sunlight is incident, and the heat absorbing tube group

合一端与工作流体进口管连接,而另一端与工作流体出口管连接,其中该吸热管组合是由 Together with the working fluid inlet tube end connector, and the other end connected to the working fluid outlet pipe, wherein the pipe assembly is composed of heat absorbing

多根直径较小的管道组成,这些管道以并联的方式与工作流体进口管与出口管连接。 A plurality of small diameter pipes composition, the pipes in parallel manner with the working fluid inlet pipe and an outlet pipe.

[0005] 依据上述主要特征,该太阳能接收器在与开口相对的另一端设有一反射体,该反 [0005] According to the above main features, the solar receiver at the other end opposite to the opening is provided with a reflector, the reaction

射体延伸至该腔体内,以将入射的太阳光反射至吸热管上。 The projectile extends into the cavity to the incident sunlight reflected onto the absorber tube.

[0006] 依据上述主要特征,该反射体为圆锥状或三角锥形或方锥状。 [0006] According to the above main features, the reflector cone or a quadrangular pyramid shape or a triangular conical shape.

[0007] 依据上述主要特征,该吸热管组合从开口一端到另一端呈倒锥形或半椭圆形排布。 [0007] According to the above main features, the heat absorbing composition from the opening of tube end to the other inverted conical shape or semi-elliptical arrangement.

[0008] 依据上述主要特征,该腔体的开口外部覆盖一透明盖体。 [0008] According to the above main features, the external opening of the cavity is covered by a transparent cover.

[0009] 依据上述主要特征,该透明盖体由高透光率的材料制成。 [0009] According to the above main features, the transparent cover is made of a material having a high light transmittance.

[0010] 依据上述主要特征,该吸热管组合表面涂有太阳光选择性吸收涂膜。 [0010] According to the above main features, the heat absorbing tube is coated with a combination of solar selective absorbing coating.

[0011] 依据上述主要特征,该接收器外部设有一壳体,并且壳体与吸热管组合之间设有 [0011] According to the above main feature, the receiver is provided with an outer housing, and is provided between the housing and the heat absorbing tube assembly

绝热保温层。 Heat insulation layer.

3[0012] 依据上述主要特征,该接收器壳体外表面呈流线形。 3 [0012] According to the above main features, which the receiver housing outer surface is streamlined.

[0013] 与现有技术相比较,本发明通过由多根直径较小的管道组成吸热管组合,由于管径较小,所以管道内部的工作流体加热较为均匀,从而进一步降低腔体内表面温度与出口处工作流体的温度之差,如此进一步降低了黑体辐射的热损失,从而提高了系统整体的光能-热能转换效率。 [0013] Compared with the prior art, the present invention by combination of a plurality of heat absorbing tubes of smaller diameter piping components, due to the smaller diameter, the working fluid inside the pipe is more uniform heating, thereby further reducing the surface temperature of the cavity and the difference between the temperature of the working fluid at the outlet, thus further reducing the blackbody radiation heat loss, thereby improving overall system energy - energy conversion efficiency.

【附图说明】 BRIEF DESCRIPTION

[0014] 图1为实施本发明的太阳能接收器的剖视示意图。 [0014] FIG. 1 is a solar receiver embodiment of the present invention is a schematic cross-sectional view. [0015] 图2为图1所示太阳能接收器的吸热管组合的示意图。 [0015] FIG. 2 is a solar receiver shown in Figure 1 is a schematic view of heat absorbing tube assembly. [0016]【实施方式】 [0016] [Embodiment

[0017] 请参阅图l所示,为实施本发明的太阳能集热器l的剖视示意图,该太阳能集热器1包括一壳体13,在具体实施时,该壳体13外表面呈流线形(如半圆形或椭圆形),从而减少空气阻力,并且该壳体13内部排设有吸热管组合10,该吸热管组合10呈螺旋式排布由此形成一腔体100,并且该腔体100 —端设有一开口101,以便太阳光聚光器(未图示)所聚集的太阳光15从该开口101射入该腔体100内部,以便吸热管组合10吸收。 [0017] Refer to Figure l, the cross-sectional view of embodiment l solar collector according to the invention, the solar collector 1 comprises a housing 13, in the specific embodiment, the housing outer surface is stream 13 linear (e.g., semi-circular or oval), so as to reduce air resistance, and the heat sink 13 is provided inside the discharge tube assembly housing 10, the heat absorbing pipe assembly 10 has a cavity 100 thereby forming a spiral arrangement and the cavity 100 - terminal 101 is provided with an opening, so that solar concentrator (not shown) of the collected sunlight 101 enters from the opening 15 of the internal cavity 100, in order to absorb heat absorbing tube assembly 10. 另外,该吸热管组合10表面设有选择性吸收涂膜104,如电镀黑铬层,如此吸热管组合10利用该吸收涂膜104只吸收可见光,不吸收红外光,同时也不向外辐射红外光,如此以增加吸热管10的吸热效率。 Further, the surface of the heat absorbing tube 10 in combination with selective absorption film 104, such as a black chrome plating layer, thus utilizing the heat absorbing tube assembly 10 absorb visible light absorbing coating 104 does not absorb infrared light, nor out simultaneously the infrared light radiation, so as to increase the heat absorption efficiency of the absorber tube 10.

[0018] 另外,该壳体13在开口101外部覆盖一透明盖体ll,该透明盖体11呈平板设置。 [0018] Further, the opening 101 of the housing 13 in a transparent outer cover lid ll, the transparent lid has a plate 11 disposed. 或者,该透明盖体11也可向背离开口101的方向凸出并呈曲面设置,如此经聚光器集中的太阳光15以垂直于该曲面的方向从该透明盖体11透射至该腔体100内,如此可减少反射, 从而最大效率的利用被集中的太阳光15,在实施时,该透明盖体11可为双曲面或其他形状。 Alternatively, the transparent cover member 11 can also be the opening direction 101 to and away from the convex curved surface is provided, such a transmission via the concentrator 15 to concentrated sunlight direction perpendicular to the surface of the transparent cover member 11 from the cavity to the 100, so the reflection can be reduced, so that the maximum utilization efficiency of sunlight is concentrated 15, in the implementation, the transparent cover 11 may be hyperbolic or other shapes. 较佳的,该透明盖体ll由高透光率的材料制成。 Preferably, the transparent cover body ll made of a material of high light transmittance.

[0019] 再者,为了减少入射至腔体IOO内的太阳光15再反射至大气中,该壳体13在与开口101相对的另一端设有一反射体12,该反射体12延伸至该腔体100内,如此可将被吸热管组合10表面反射的太阳光15再反射至至吸热管组合10上,以增加太阳光在该腔体100 内部反射的次数,从而更好地利于吸热管组合10吸收太阳光15。 [0019] Further, in order to reduce the incident sunlight into a cavity IOO 15 and then reflected to the atmosphere, the housing 13 at the opposite end of the opening 101 is provided with a reflector 12, the reflector 12 extends into the chamber the inner body 100, thus may be heat absorbing tube assembly 10 sunlight reflected by the surface 15 and then reflected to the composition onto the absorber tube 10, to increase the number of the sunlight inside the reflection cavity 100 so as to better facilitate absorption heat pipe assembly 10 absorb sunlight 15. 在具体实施时,该反射体12可为圆锥状、三角锥状或方锥状之一。 In a specific embodiment, the reflector 12 may be a conical shape, a triangular pyramid or square pyramid one.

[0020] 另外,该吸热管组合10呈螺旋状排布,并且从开口101 —端到另一端的螺旋半径逐渐减小,以令该吸热管组合10呈倒锥形或半椭圆形排布,即令吸热管组合10的弯折曲率产生变化,如此温度低的工作流体自开口101 —端的工作流体进口管102进入吸热管组合IO后被加热,并通过将吸热管组合IO弯折曲率的变化,从而促进流体径向混合,如此可令流体充分混合以吸收热量并从工作流体出口管103流出,从而提高热交换效率。 [0020] Further, the heat absorbing pipe assembly 10 arranged in a spiral, and from the opening 101-- end to the other end of the coil radius is gradually reduced, in order to make the heat absorbing pipe assembly 10 inverted conical or semi-elliptical discharge cloth, and even if the endothermic tube assembly 10 is bent curvature change, so the low temperature of the working fluid from the opening 101 - terminal of the working fluid inlet tube 102 into the heat absorbing tube assembly IO after heating, and the heat absorbing tube assembly by bending IO fold change curvature, to facilitate fluid radial mixing, may make such a mixed fluid flows to absorb heat from the working fluid and an outlet pipe 103, thereby improving the heat exchange efficiency. [0021] 再者,该壳体13与吸热管组合10之间设有绝热保温层14,以便防止吸热管组合10吸收的热量传导至壳体13外部,当然还可以是其他的防止热辐射的结构,此处不再赘述。 [0021] Further, the housing 13 between the heat absorbing tube assembly 10 is provided with a heat insulation layer 14, in order to prevent heat absorption heat absorbing tube assembly 10 is transferred to the outer housing 13, of course also be other to prevent thermal radiation structure is not repeated here.

[0022] 另外,如图2所示,实施本发明的吸热管组合10包括多根直径较小的管道(图2 [0022] Further, as shown in FIG heat absorbing tube assembly embodiment of the present invention includes a plurality of small diameter pipe 2 (FIG. 2

中为二根),该多根管道以并联的方式与工作流体进口管102与出口管103连接。 For two), the plurality of conduits in a parallel way with the working fluid inlet tube 102 and outlet tube 103 is connected.

[0023] 由于容积式太阳能接收器腔体内表面(即吸热管被阳光照射的表面)与工作流体之间的热传输速率=Nu*流体导热系数/管道直径,其中Nu (努赛尔数)=0. 023Rea8Pra4 ; Re(雷诺数)=工作流体的密度*工作流体的流速*管道直径/热对流系数,Pr(普朗特数)=热传导系数/热扩散系数,即容积式太阳能接收器腔体的内表面(即吸热管被阳光照射的表面)与工作流体之间的热传输速率是与管道直径成反比例,管径越小则热传输速率越高,从而管道内的工作流体可以充分加热,从而可以提高换热效率。 [0023] Since the volumetric solar receiver cavity inner surface (i.e. the surface of the absorber tube is irradiated with sunlight) the rate of heat transfer between the working fluid and the thermal conductivity of the fluid = Nu * / pipe diameter, which of Nu (Nusselt number) . = 0 023Rea8Pra4; Re (Reynolds number) = density of the working fluid in the working fluid flow rate * * pipe diameter / thermal convection coefficient, Pr (Prandtl number) = thermal conductivity / thermal diffusivity, i.e. the volumetric solar receiver cavity the rate of heat transfer between the inner surface of the body (i.e., sun heat absorbing tube is irradiated surface) of the working fluid is inversely proportional to the pipe diameter, the smaller the diameter the higher the heat transfer rate, so that the working fluid in the conduit can be sufficiently heating, heat exchange efficiency can be improved. [0024] 另外,从以上的推导也可看出,在管道直径确定的前提下,热传输速率是与热传输液体的雷诺数的0. 8次方成正比,而雷诺数又与工作流体的流速成正比,因此增加工作流体的流速,也可提高热传输速率,从而管道内的工作流体可以充分加热,从而也可以提高换 [0024] Further, also be seen from the above derivation, the premise of the determined pipe diameter, heat transfer rate is proportional to the 0.8 power of the Reynolds number and the heat transfer liquid, and the Reynolds number of the working fluid proportional to the flow rate, thereby increasing the flow rate of the working fluid, the heat transfer rate can be improved, so that the working fluid in the conduit can be heated sufficiently, so that change can be improved

热效率。 Thermal efficiency.

[0025] 同时,在以上的二种情形下,由于管道内工作流体可以充分加热,因此腔体内表面 [0025] Meanwhile, at least two kinds of case, since the working fluid within the conduit can be sufficiently heated, the surface of the cavity

与该太阳能接收器出口管103处的工作流体的温度差可以减小,而占系统热损失主要部分 The temperature difference between the working fluid of the solar receiver 103 of the outlet tube can be reduced, and the heat loss is dominant system

的黑体辐射热损失是与此温度差的四次方成正比,因此可以减小黑体辐射热损失,从而可 Black body radiation heat loss is proportional to the fourth power of the temperature difference, it is possible to reduce the black-body radiation heat loss, thereby

以提高系统的光能_热能转换效率。 To improve the system's energy _ energy conversion efficiency.

[0026] 除上述优点外,本发明还具有如下优点: [0026] In addition to the above advantages, the present invention has the following advantages:

[0027] 第一,实施本发明的集热器1通过在腔体100的开口101处设置一透明盖体11,如 [0027] First, embodiment 1 of the present invention by providing a heat collector 101 is transparent in the opening of the cavity 100 of the cover 11, as

此可通过此透明盖体ll封闭该开口101,从而避免沙尘等杂质进入集热器1内,也可避免集 Within this can close the opening 101 by the transparent cover member ll, thereby preventing dust and other impurities from entering the collector 1 may also be set to avoid

热器1内的热量随空气的对流被带出集热器l,如此利于提高该集热器1的效率。 1 heat in the heat with convection air out of the collector is l, thus help to improve the efficiency of the collector 1.

[0028] 第二,通过将吸热管IO排布为倒锥形或半椭圆形,从而令吸热管10的弯折曲率 [0028] Second, by the heat absorbing tube is arranged IO inverted conical or semi-elliptical, so that the heat absorbing tube 10 is bent curvature

产生变化,如此温度低的工作流体自开口101 —端进入吸热管后被加热,并通过将吸热管 A difference, so the low temperature of the working fluid from the opening 101 - terminal into the heat absorbing tube after being heated by the heat absorbing tube

10弯折曲率的变化,促成流体湍流,如此可令流体充分混合以吸收热量,从而提高热交换效率。 10 in bending curvature, to promote fluid turbulence, so that the fluid can thus sufficiently mixed to absorb heat, thereby improving the heat exchange efficiency.

[0029] 第三,通过在吸热管10表面涂覆选择性吸收涂膜104,如电镀黑铬层,如此吸热管10利用该选择性吸收涂膜104只吸收可见光,不吸收红外光,同时也不向外辐射红外光,如此以增加该集热器1的吸热效率。 [0029] Third, the coating film 104 by absorbing the heat absorbing tube 10 selective surface coating, such as black chrome plating layer, so that the heat absorbing tube 10 by using selective absorption film 104 absorb visible light, does not absorb infrared light, while not outwardly infrared radiation, so as to increase the heat absorption efficiency of the collector 1.

[0030] 第四,通过将该集热器1的壳体13的外表面设计为流线型,从而减少空气阻力,如此可以进一步降低该集热器l支撑框架(未图示)的受力,从而利于减少所用的支撑材料及可维持较长的使用寿命。 [0030] Fourth, the design of the outer surface of the housing 13 of the collector 1 is streamlined so as to reduce air resistance, so that the collector can be further reduced l support frame (not shown) of the force, so that It helps to reduce the support material used and can be maintained for a longer service life.

Claims (10)

  1. 一种太阳能接收器,其特征在于:该太阳能接收器包括吸热管组合,该吸热管组合螺旋排布形成一腔体,该腔体一端设有一开口,以接收集中入射的太阳光,而该吸热管组合一端与工作流体进口管连接,而另一端与工作流体出口管连接,其中该吸热管组合是由多根直径较小的管道组成,这些管道以并联的方式与工作流体进口管与出口管连接。 A solar receiver, characterized in that: the solar receiver comprises a heat absorbing tube assembly, the pipe assembly heat absorbing coil arrangement forming a cavity, the cavity having an opening at one end to receive concentrated sunlight is incident, and One end of the pipe assembly heat absorbing working fluid inlet pipe is connected, and the other end connected to the working fluid outlet tube, wherein the heat absorbing tube is composed of a combination of a plurality of small diameter pipes composition, the pipes in parallel at the working fluid inlet and outlet tube to the connection.
  2. 2. 如权利要求1所述的太阳能接收器,其特征在于:该太阳能接收器在与开口相对的另一端设有一反射体,该反射体延伸至该腔体内,以将入射的太阳光反射至吸热管上。 2. The solar receiver according to claim 1, wherein: the solar receiver at the other end opposite to the opening is provided with a reflector, the reflector member extends into the cavity to the incident sunlight reflected to the absorber tube.
  3. 3. 如权利要求2所述的太阳能接收器,其特征在于:该反射体为圆锥状或三角锥形或方锥状。 The solar receiver according to claim 2, wherein: the reflector is a conical shape or a triangular pyramid or square pyramid.
  4. 4. 如权利要求1所述的太阳能接收器,其特征在于:该吸热管组合从开口一端到另一端呈倒锥形或半椭圆形排布。 4. The solar receiver of claim 1, wherein: the heat absorbing tube composition from an opening end to the other inverted conical shape or semi-elliptical arrangement.
  5. 5. 如权利要求1所述的太阳能接收器,其特征在于:该腔体的开口外部覆盖一透明盖体。 The solar receiver of claim 1, wherein: the outer cavity opening covered by a transparent cover.
  6. 6. 如权利要求5所述的太阳能接收器,其特征在于:该透明盖体呈平板状。 The solar receiver of claim 5 as claimed in claim 6, wherein: the transparent cover generally tabular.
  7. 7. 如权利要求6所述的太阳能接收器,其特征在于:该透明盖体由高透光率的材料制成。 The solar receiver of claim 6, wherein: the transparent cover is made of a material having a high light transmittance.
  8. 8. 如权利要求1所述的太阳能接收器,其特征在于:该吸热管组合表面涂有太阳光选择性吸收涂膜。 8. The solar receiver of claim 1, wherein: the heat absorbing tube is coated with a combination of solar selective absorbing coating.
  9. 9. 如权利要求l所述的太阳能接收器,其特征在于:该接收器外部设有一壳体,并且壳体与吸热管组合之间设有绝热保温层。 L of the solar receiver as claimed in claim 9, wherein: the receiver is provided with an outer housing, and the housing is provided with heat insulation layer between the heat absorbing tube assembly.
  10. 10. 如权利要求9所述的太阳能接收器,其特征在于:该接收器壳体外表面呈流线形。 10. The solar receiver of claim 9, wherein: the receiver housing outer surface is streamlined.
CN 201010131736 2010-03-24 2010-03-24 Solar receiver CN101788199A (en)

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CN104534687A (en) * 2014-12-26 2015-04-22 福建工程学院 Solar heat absorber with extending pipe bundle
CN105674595A (en) * 2016-04-08 2016-06-15 北京耀华玻璃装饰工程有限公司 Solar collector and solar device
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