WO2015144452A1 - Method for treating an outer surface of a heat transfer fluid tube - Google Patents

Method for treating an outer surface of a heat transfer fluid tube Download PDF

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Publication number
WO2015144452A1
WO2015144452A1 PCT/EP2015/055269 EP2015055269W WO2015144452A1 WO 2015144452 A1 WO2015144452 A1 WO 2015144452A1 EP 2015055269 W EP2015055269 W EP 2015055269W WO 2015144452 A1 WO2015144452 A1 WO 2015144452A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat transfer
transfer fluid
fluid tube
treating
hydrogen plasma
Prior art date
Application number
PCT/EP2015/055269
Other languages
French (fr)
Inventor
Peter Simon Rop
Original Assignee
Nem Energy B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nem Energy B.V. filed Critical Nem Energy B.V.
Priority to AU2015238639A priority Critical patent/AU2015238639B2/en
Priority to CN201580009871.2A priority patent/CN106029951A/en
Priority to US15/125,431 priority patent/US20170076913A1/en
Priority to EP15711456.2A priority patent/EP3090076A1/en
Publication of WO2015144452A1 publication Critical patent/WO2015144452A1/en
Priority to IL247060A priority patent/IL247060A0/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F4/00—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/80—Solar heat collectors using working fluids comprising porous material or permeable masses directly contacting the working fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
    • F24S70/25—Coatings made of metallic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
    • H01J2237/32—Processing objects by plasma generation
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems

Definitions

  • the present invention relates to a method for treating an outer surface of a heat transfer fluid tube according to claim 1 and especially to a method for treating a heat trans ⁇ fer fluid tube for a receiver of a solar thermal power plant.
  • solar thermal power plants like e.g. solar fields made out of heliostats arranged around a tower receiver, solar ra ⁇ diation is concentrated and reflected from the heliostats to a receiving area of the tower receiver.
  • heat transfer fluid tubes are arranged in such a way, that ideally almost all of the solar radiation reflected from the heliostats is used for heating the heat transfer fluid, flowing in the tubes.
  • the heated fluid transfers the heat to a working fluid of a thermal power gen ⁇ eration system.
  • the heat transfer fluid can be for example molten salt or water/steam.
  • the receiving area has the physical characteris ⁇ tic, that the radiation is not completely absorbed and thus the remainder of the incident radiation is reflected on the heat transfer fluid tubes. That leads to the fact, that the receiving area has an elevated temperature (because of the balance between absorption of radiation energy and cooling by the flowing medium) and thus the receiving area also emits radiation energy, as a function of its own temperature and emissivity characteristic.
  • the absorption of the receiver area is enhanced by ap ⁇ plying a coating to the outside surface of the heat transfer fluid tubes.
  • a typical commercially available coating is Pyromark, as known from "Solar Selective Coatings for Concen- tration", Advanced Materials & Processes, January 212. This coating increases the absorption coefficient of the heat transfer fluid tubes up to 95%, which is very close to a physical black body. Thus 95% of the incident radiation is absorbed and only 5% is reflected.
  • the problem of this coating is that the coating degrades by the high temperature of the receiver area during operating conditions.
  • the absorption coefficient has decreased to less than 90%.
  • a perfect black body means that this body has the capability to completely absorb the incident radiation, so it has an absorption coefficient of 100%.
  • This characteristic can also be approximated by applying a special geometry of the heat transfer fluid tubes in the receiving area. In the heat transfer fluid tubes the incident radiation is absorbed, and the reflected radiation is reflected randomly within the receiver area and thus back to other heat transfer fluid tubes of the receiver area. So the reflected radiation is not lost, but absorbed in a second instance, or even after more instances, depending on how often the radiation is reflected within the receiver area.
  • this object is achieved with the method according to claim 1, comprising the steps of providing a heat transfer fluid tube and treating the outer surface of this heat transfer fluid tube with a hydrogen plasma jet, so that a porosity in the range of a nano-scale is created in a thin layer of that outer surface (2) .
  • the heat transfer fluid tubes are made of chrome- steel alloy, or especially for higher heat transfer fluid temperatures stainless steel or nickel alloy. And in case of using nickel alloy as material for the heat transfer fluid tubes, the porous and thus high absorption thin layer can be achieved immediately on the base material of the tube.
  • the sur- face of the heat transfer fluid tube is first coated with an extra layer of a high absorbing material, other than the material of the heat transfer fluid tube.
  • a high absorp ⁇ tion material can be e.g. tungsten.
  • the surface of this extra and thin layer is treated with the hydrogen plasma jet. Because of the corrosion and high-temperature resilience of tungsten, the nano-structure will not deteriorate by at ⁇ mospheric conditions and high temperature during operating conditions.
  • FIG 1 shows a cross-section through a heat transfer fluid tube where the inventive method is applied
  • FIG 2 shows an alternative embodiment of the present in ⁇ vention .
  • FIG 1 shows a cross-section of a heat transfer fluid tube 1.
  • the outer surface 2 of this heat transfer fluid tube is treated with a hydrogen plasma jet 3.
  • the schematic shown hydrogen plasma jet 3 comes from a hydrogen plasma source, which is not shown in greater detail. Also not shown are additional equipment for moving the tube and the hydrogen plasma jet relative to each other, which are needed for applying the hydrogen plasma to all three dimensions of the heat transfer fluid tubes surface.
  • Applying a hydrogen plasma jet 3, having an energy level with an Ion flux above 10e 24 m ⁇ 2 s _1 transforms a thin layer of the outer surface 2 to a porous crust with nano-scale porosity.
  • FIG 2 shows a cross-section of a preferred embodiment of the present invention.
  • a high absorbing material other than the material of the heat transfer fluid tube, is applied as an extra layer 4 on the surface of the heat transfer fluid tube 1.
  • the surface of this extra layer 4 which now forms the outer surface 2 ' of the heat transfer fluid tube 1 is treated with the hydrogen plasma jet 3.
  • high temperature resistant tube material like nickel alloy can be combined with high absorption material tungsten as an additional surface layer on the outer surface of the tube.
  • this additional tungsten layer of about one mi- crometer thickness is treated with the hydrogen plasma as long as the complete tungsten layer has a porosity of less than 50 nm.
  • the aforesaid describes method is used for heat transfer fluid tubes of a receiver in a solar thermal power plant. But the method is also applicable to heat trans fer fluid tubes in e.g. a furnace or other installations, where a very high-efficient absorption of incident radiation is needed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Sustainable Development (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The present invention relates to a method for treating an outer surface (2) of a heat transfer fluid tube (1) especially for a receiver of a solar thermal power plant, comprising the steps: of providing the heat transfer fluid tube (1) and treating the outer surface (2) with a hydrogen plasma jet (3) so that a porosity in the range of a nano-scale is created in a thin layer of that outer surface (2).

Description

Description
Method for treating an outer surface of a heat transfer fluid tube
The present invention relates to a method for treating an outer surface of a heat transfer fluid tube according to claim 1 and especially to a method for treating a heat trans¬ fer fluid tube for a receiver of a solar thermal power plant. In solar thermal power plants, like e.g. solar fields made out of heliostats arranged around a tower receiver, solar ra¬ diation is concentrated and reflected from the heliostats to a receiving area of the tower receiver. In this receiving area, heat transfer fluid tubes are arranged in such a way, that ideally almost all of the solar radiation reflected from the heliostats is used for heating the heat transfer fluid, flowing in the tubes. In a heat exchanger the heated fluid transfers the heat to a working fluid of a thermal power gen¬ eration system. The heat transfer fluid can be for example molten salt or water/steam.
In reality the receiving area has the physical characteris¬ tic, that the radiation is not completely absorbed and thus the remainder of the incident radiation is reflected on the heat transfer fluid tubes. That leads to the fact, that the receiving area has an elevated temperature (because of the balance between absorption of radiation energy and cooling by the flowing medium) and thus the receiving area also emits radiation energy, as a function of its own temperature and emissivity characteristic.
The more efficient the receiver area is absorbing the pro¬ jected solar radiation coming from the solar field, the smaller the solar field can be for a required output power of the total power plant. And since the solar field is about 45% of the total power plant costs, this can give a substantial cost saving. Today the absorption of the receiver area is enhanced by ap¬ plying a coating to the outside surface of the heat transfer fluid tubes. A typical commercially available coating is Pyromark, as known from "Solar Selective Coatings for Concen- tration", Advanced Materials & Processes, January 212. This coating increases the absorption coefficient of the heat transfer fluid tubes up to 95%, which is very close to a physical black body. Thus 95% of the incident radiation is absorbed and only 5% is reflected. But the problem of this coating is that the coating degrades by the high temperature of the receiver area during operating conditions. Experiences from the past show that after a few years, the absorption coefficient has decreased to less than 90%. In physics, a perfect black body means that this body has the capability to completely absorb the incident radiation, so it has an absorption coefficient of 100%. This characteristic can also be approximated by applying a special geometry of the heat transfer fluid tubes in the receiving area. In the heat transfer fluid tubes the incident radiation is absorbed, and the reflected radiation is reflected randomly within the receiver area and thus back to other heat transfer fluid tubes of the receiver area. So the reflected radiation is not lost, but absorbed in a second instance, or even after more instances, depending on how often the radiation is reflected within the receiver area.
Another way how to achieve a physical black body is described in US 2012/0180783 Al . From US 2012/0180783 Al it is known to improve the absorption of the heat transfer fluid tubes for linear concentrating solar thermal power plants with an extra absorber layer, wherein the absorber layer is generated by cold gas sputtering. Thus by applying suitable method parame¬ ters, an increased surface roughness can be achieved by means of pores in the surface region of the absorber layer. It is an object of the present invention to provide an im¬ proved method for such a black body-like surface of a heat transfer fluid tube. According to the present invention, this object is achieved with the method according to claim 1, comprising the steps of providing a heat transfer fluid tube and treating the outer surface of this heat transfer fluid tube with a hydrogen plasma jet, so that a porosity in the range of a nano-scale is created in a thin layer of that outer surface (2) .
It is known from plasma technology, that a metallic surface becomes porous, when intensive hydrogen plasma is shot at such a surface. Applying this knowledge to the present method for treating an outer surface of heat transfer fluid tube, a porous crust of approximately one micrometer thickness and porosity in the nano-scale range can be achieved in a thin layer on the outer surface of the tube. Advantageously, when treating the surface of the heat transfer fluid tube with a hydrogen plasma jet, having an energy level with an Ion flux above 10e24 m~2s_1, a crust with a layer thickness of about around one micrometer and a nanometer structure smaller than 50nm can be created. For an incident solar radiation, the absorption characteristics of such a treated porous surface is very close to the characteristic of a perfect black body.
Typically, the heat transfer fluid tubes are made of chrome- steel alloy, or especially for higher heat transfer fluid temperatures stainless steel or nickel alloy. And in case of using nickel alloy as material for the heat transfer fluid tubes, the porous and thus high absorption thin layer can be achieved immediately on the base material of the tube.
In a preferred embodiment of the present invention the sur- face of the heat transfer fluid tube is first coated with an extra layer of a high absorbing material, other than the material of the heat transfer fluid tube. Such a high absorp¬ tion material can be e.g. tungsten. Afterwards the surface of this extra and thin layer is treated with the hydrogen plasma jet. Because of the corrosion and high-temperature resilience of tungsten, the nano-structure will not deteriorate by at¬ mospheric conditions and high temperature during operating conditions.
Applying the present invention to the heat transfer fluid tubes for a receiver of a solar thermal power plant leads to a constant absorbing layer at the outer surface of the tube with an efficiency very close to 100%. This means that the size of the solar field can be at least 5% smaller, resulting in a considerable cost saving.
The invention now will be explained in more detail with ref- erence to the appended drawing. The drawings show only an ex¬ ample of a practical embodiment of the invention, without limiting the scope of the invention, in which:
FIG 1 shows a cross-section through a heat transfer fluid tube where the inventive method is applied,
FIG 2 shows an alternative embodiment of the present in¬ vention .
FIG 1 shows a cross-section of a heat transfer fluid tube 1. According to the present invention the outer surface 2 of this heat transfer fluid tube is treated with a hydrogen plasma jet 3. The schematic shown hydrogen plasma jet 3 comes from a hydrogen plasma source, which is not shown in greater detail. Also not shown are additional equipment for moving the tube and the hydrogen plasma jet relative to each other, which are needed for applying the hydrogen plasma to all three dimensions of the heat transfer fluid tubes surface. Applying a hydrogen plasma jet 3, having an energy level with an Ion flux above 10e24 m~2s_1, transforms a thin layer of the outer surface 2 to a porous crust with nano-scale porosity.
FIG 2 shows a cross-section of a preferred embodiment of the present invention. Here a high absorbing material, other than the material of the heat transfer fluid tube, is applied as an extra layer 4 on the surface of the heat transfer fluid tube 1. Subsequently the surface of this extra layer 4, which now forms the outer surface 2 ' of the heat transfer fluid tube 1, is treated with the hydrogen plasma jet 3. Therewith, high temperature resistant tube material like nickel alloy can be combined with high absorption material tungsten as an additional surface layer on the outer surface of the tube. Preferably, this additional tungsten layer of about one mi- crometer thickness is treated with the hydrogen plasma as long as the complete tungsten layer has a porosity of less than 50 nm.
Advantageously the aforesaid describes method is used for heat transfer fluid tubes of a receiver in a solar thermal power plant. But the method is also applicable to heat trans fer fluid tubes in e.g. a furnace or other installations, where a very high-efficient absorption of incident radiation is needed.

Claims

Claims
1. A method for treating an outer surface (2,2') of a heat transfer fluid tube (1) , comprising the steps:
- providing the heat transfer fluid tube (1),
- treating the outer surface (2) with a hydrogen plasma jet (3) so that a porosity in the range of a nano-scale is creat¬ ed in a thin layer of that outer surface (2) .
2. The method according to claim 1,
c h a r a c t e r i z e d i n t h a t
the material of the heat transfer fluid tube (1) is nickel alloy .
3. The method according to claim 1,
c h a r a c t e r i z e d i n t h a t
before treating the outer surface (2') with a hydrogen plasma jet (3) , a high absorbing material, other than the material of the heat transfer fluid tube, is applied as an extra layer (4) on the surface of the heat transfer fluid tube (1) .
4. The method according to claim 3,
c h a r a c t e r i z e d i n t h a t
the material of the heat transfer fluid tube (1) is stainless steel or nickel alloy and the material of the extra layer (4) is tungsten with a thickness of about one micrometer.
5. The method according to any of the claims 1 to 4,
c h a r a c t e r i z e d i n t h a t
the hydrogen plasma jet (3) having an energy level with an Ion flux above 10e24 m~2s_1.
6. Use of the method according to any of the claims 1 to 5 for heat transfer fluid tubes of a receiver in a solar ther- mal power plant.
PCT/EP2015/055269 2014-03-27 2015-03-13 Method for treating an outer surface of a heat transfer fluid tube WO2015144452A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2015238639A AU2015238639B2 (en) 2014-03-27 2015-03-13 Method for treating an outer surface of a heat transfer fluid tube
CN201580009871.2A CN106029951A (en) 2014-03-27 2015-03-13 Method for treating an outer surface of a heat transfer fluid tube
US15/125,431 US20170076913A1 (en) 2014-03-27 2015-03-13 Method for treating an outer surface of a heat transfer fluid tube
EP15711456.2A EP3090076A1 (en) 2014-03-27 2015-03-13 Method for treating an outer surface of a heat transfer fluid tube
IL247060A IL247060A0 (en) 2014-03-27 2016-08-02 Method for treating an outer surface of a heat transfer fluid tube

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14161904.9 2014-03-27
EP14161904.9A EP2924144A1 (en) 2014-03-27 2014-03-27 Method for treating an outer surface of a heat transfer fluid tube

Publications (1)

Publication Number Publication Date
WO2015144452A1 true WO2015144452A1 (en) 2015-10-01

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ID=50433948

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/055269 WO2015144452A1 (en) 2014-03-27 2015-03-13 Method for treating an outer surface of a heat transfer fluid tube

Country Status (6)

Country Link
US (1) US20170076913A1 (en)
EP (2) EP2924144A1 (en)
CN (1) CN106029951A (en)
AU (1) AU2015238639B2 (en)
IL (1) IL247060A0 (en)
WO (1) WO2015144452A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005698A (en) * 1974-10-18 1977-02-01 International Business Machines Corporation Photon energy converter
US4431499A (en) * 1982-02-26 1984-02-14 The United States Of America As Represented By The United States Department Of Energy Method of sputter etching a surface
US4465551A (en) * 1980-05-07 1984-08-14 Horwitz Christopher M Graded microstructured layers formed by vacuum etching
US4890669A (en) * 1986-07-02 1990-01-02 Carrier Corporation Porous coating for enhanced tubes
US20120180783A1 (en) 2009-09-30 2012-07-19 Krueger Ursus Central tube for a linear concentrating solar thermal power plant, having an absorber layer, and method for applying said absorber layer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005698A (en) * 1974-10-18 1977-02-01 International Business Machines Corporation Photon energy converter
US4465551A (en) * 1980-05-07 1984-08-14 Horwitz Christopher M Graded microstructured layers formed by vacuum etching
US4431499A (en) * 1982-02-26 1984-02-14 The United States Of America As Represented By The United States Department Of Energy Method of sputter etching a surface
US4890669A (en) * 1986-07-02 1990-01-02 Carrier Corporation Porous coating for enhanced tubes
US20120180783A1 (en) 2009-09-30 2012-07-19 Krueger Ursus Central tube for a linear concentrating solar thermal power plant, having an absorber layer, and method for applying said absorber layer

Also Published As

Publication number Publication date
AU2015238639B2 (en) 2017-06-29
US20170076913A1 (en) 2017-03-16
CN106029951A (en) 2016-10-12
EP2924144A1 (en) 2015-09-30
IL247060A0 (en) 2016-09-29
EP3090076A1 (en) 2016-11-09
AU2015238639A1 (en) 2016-08-18

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