A solar heat collector is disclosed having a cover plate mounted in spaced relation with a solar energy absorber and having interposed between said cover plate and solar absorber an infrared absorber material.
Energy Citations Database
... Descriptors : *PATENTS, *SOLAR ROCKETS, *ABSORBERS(EQUIPMENT), LIQUID PROPELLANTS, LIQUEFIED GASES, HYDROGEN, HEAT ...
DTIC Science & Technology
... Accession Number : AD0291843. Title : INSOLATION AND ABSORBED SOLAR RADIATION AT THE GROUND IN THE ARCTIC. ...
A solar absorber is described comprising a 1000 to 1500 A thick layer of lead sulfide on a thermally conductive base. The solar absorber reflects on the order of 97% of the infrared while absorbing between 90 and 95% of the solar radiation band. 2 claims, 2 figures.
... The problem of positioning the solar focal spot on the thruster absorber is due to the visual complexity of the absorber, which is compounded by ...
The absorber of a solar collector expands and contracts with varying insolation. A detector responsive thereto provides indication of the absorber temperature for controlling system parameters.
... Title : Solar Absorber Coating Study. Corporate Author : HONEYWELL INC MINNEAPOLIS MINN SYSTEMS AND RESEARCH DIV. ...
... Accession Number : ADD419469. Title : Silicon Films as Selective Absorbers for Solar Energy Conversion,. Corporate Author : ...
... Title : SILICON FILMS AS SELECTIVE ABSORBERS FOR SOLAR ENERGY CONVERSION. Descriptive Note : Journal article,. ...
... Accession Number : AD0455068. Title : HIGH TEMPERATURE SOLAR ABSORBER COATINGS. PART II. Descriptive Note : Rept. ...
... Descriptors : *COATINGS, ABSORBERS(MATERIALS), SOLAR RADIATION, THIN FILMS, METAL FILMS, DIELECTRIC FILMS, ALUMINATES ...
Jul 1, 1977 ... Subject Terms: ABSTRACTS; ENERGY TECHNOLOGY; SOLAR CELLS; SOLAR COLLECTORS; SOLAR COOLING; SOLAR ENERGY; SOLAR ENERGY ABSORBERS; SOLAR ...
NASA Website
This report describes the concentrating solar power (CSP) systems using solar absorbers to convert concentrated sunlight to thermal electric power. It is possible to achieve solar absorber surfaces for efficient photothermal conversion having high solar a...
National Technical Information Service (NTIS)
Solar heat is absorbed and heats water chambers, which are formed like cylindrical transparent chambers.
The invention relates to a solar energy collector comprising solar energy absorbing material within chamber having a transparent wall, solar energy being transmitted through the transparent wall, and efficiently absorbed by the absorbing material, for transfer to a heat ...
The invention relates to a solar energy collector comprising solar energy absorbing material within a chamber having a transparent wall. Solar energy is transmitted through the transparent wall, and efficiently absorbed by the absorbing material, for transfer to a heat ...
... Title : Use of Honeycomb as Solar Radiation Absorber and Heat Exchanger in an Air-Type Solar Collector,. Corporate Author : ...
... 5. Discussion 8 a. Relation of solar heat load to visible radiation absorbed 9 ... a. Relation of solar heat load to visible radiation absorbed ...
An improved solar collector is disclosed which includes a light absorbent component composed of a filamentous structure and a coating of solar radiation absorbent material on the filaments of the filamentous structure.
The invention relates to a solar energy collector comprising solar energy absorbing material within a chamber having a transparent wall. Solar energy is transmitted through the transparent wall, and efficiently absorbed by the absorbing material, for tran...
... SOLAR ROCKETS, ORBITS, HEAT EXCHANGERS, SPACE SHUTTLES, ABSORBERS(EQUIPMENT), THRUSTERS, SOLAR COLLECTORS. ...
An apparatus is described for absorbing electromagnetic waves emitted from the sun and for converting said radiation waves into thermal energy for heating a fluid. (WDM)
... Title : SELECTIVE ABSORBER USING GLOW-DISCHARGE AMORPHOUS SILICON FOR SOLAR PHOTOTHERMAL CONVERSION. ...
... control of space vehicles by regulation of the solar absorption and ... The use of these compounds as ultraviolet radiation absorbers in pigmented ...
models of the absorbers based on solar abundances severely overpredict the 0 VI columns previously obtained with the Far Ultraviolet Spectrograph, ...
... absorbing properties capable of visual and infrared camouflage. ... NONREFLECTING COATINGS, DARKNESS, BINDERS, PIGMENTS, SHIP ...
Solar energy absorbing means in solar collectors are provided by a solar selective carbon surface. A solar selective carbon surface is a microporous carbon surface having pores within the range of 0.2 to 2 micrometers. Such a surface is provided in a micr...
Concentrating solar power (CSP) systems use solar absorbers to convert the heat from sunlight to electric power. Increased operating temperatures are necessary to lower the cost of solar-generated electricity by improving efficiencies and reducing thermal...
We propose a metamaterial based absorber design that operates at the infrared regime. The absorption peak was 83.6%. We can incorporate solar-cell layers inside the metamaterial absorber in order to significantly increase solar-cell efficiency.
NASA Astrophysics Data System (ADS)
A panel for selectively absorbing solar thermal energy is reported that consists of a metallic substrate, a layer of bright metallic material carried on the substrate, and a solar thermal energy absorbing coating carried on the bright metallic material. A...
An unglazed transpired solar collector using solar radiation to heat incoming air for distribution, comprises an unglazed absorber formed of low thermal-conductance material having a front surface for receiving the solar radiation and openings in the unglazed absorber for passage of the ...
DOEpatents
An unglazed transpired solar collector using solar radiation to heat incoming air for distribution, comprising an unglazed absorber formed of low thermal-conductance material having a front surface for receiving the solar radiation and openings in the unglazed absorber for passage of the ...
A solar energy absorber is provided in which the absorber surface is comprised of a multiplicity of free ends of carbon or metallic fibers. The fibers forming the absorber surface are straight and are aligned in a parallel and side-by-side relationship. The small diameters of the fibers and the very close spacing ...
... Title : Volumetric Absorber as Solar Engine Utilizing Laser Thermal Power for Energy Input. Descriptive Note : Technical paper,. ...
A box of sheet metal, the top of which is corrugated to present a series of convex surfaces, is used as a solar heat absorber. Water is circulated through the bottom of the box, absorbing heat.
Jul 12, 2006... the so called 'UV absorbers'- ultraviolet markings on the cloud top, ... They are so called because they absorb almost half of the solar ...
... Accession Number : ADD004212. Title : PBS-Al Selective Solar Absorber. Descriptive Note : Patent,. Corporate Author : DEPARTMENT ...
it has an excellent match with the solar spectrum. Since these are direct bangap semiconductors with high absorption coefficient, very thin absorber layer are needed to absorb...
National Renewable Energy Laboratory (NREL)
Apparatus is designed with a transparent window through which the solar rays pass and are concentrated on heat-absorbing liquid in coils.
... Title : HIGH TEMPERATURE SOLAR ABSORBER COATINGS, PART III. Descriptive Note : Technical documentary rept. 1 Jul 64-1 Jul 65,. ...
... Title : Bonding Solar Selective Absorber Foils to Glass Receiver Tubes for Use in Evacuated Tubular Collectors: Preliminary Studies,. ...
Solar collectors, concentrators, and absorbers; solar cells; solar cookers, dryers, furnaces, generators; solar heat engines; solar heating and cooling systems; solar power plants; solar stills; solar water ...
A sun tracking solar energy collector assembly having both a longitudinally extending flat plate absorber and a tube absorber spaced from and extending longitudinally generally parallel to the flat plate absorber. In one form a parabolic reflector focuses direct rays of solar radiation on the ...
A solar-thermal engine serves as a high-temperature solar-radiation absorber, heat exchanger, and rocket nozzle, collecting concentrated solar radiation into an absorber cavity and transferring this energy to a propellant as heat. Propellant gas can be he...
An improved low-cost solar air heater is disclosed which utilizes an array of holes or jets in an intermediate solar window to produce impingement of the air on the upper or solar energy absorbing surface of the absorber plate to enhance heat transfer efficiency and reduce convection losses ...
A glass heat pipe is adapted for use as a solar energy absorber in an evacuated tube solar collector and for transferring the absorbed solar energy to a working fluid medium or heat sink for storage or practical use. A capillary wick is formed of granular...
Design is presented for a solar energy concentrating collector having at least one reflector surface and at least one substantially planar vertical absorbing means coacting therewith for the purpose of absorbing reflected solar rays, said absorber being at least partially located in a plane ...
... how the wavefront sensor is to be utilized in a solar application and ... the algorithms used in locating the focal spot on a thruster absorber utilizing a ...
... ENERGY ABSORBERS, THERMODYNAMICS, ENERGY CONVERSION, SPACE FLIGHT, PHOTOVOLTAIC EFFECT, SOLAR RADIATION, SOLAR ...
... RADIATION SHIELDING, HEAT LOSS, SPECIFIC IMPULSE, ROCKETS, SOLAR HEATING, ABSORBERS(EQUIPMENT), LABORATORIES. ...
... spectrum of alkali metal vapors in hydrogen gas to support the design of a solar powered rocket engine that used the volumetric absorber concept. ...
... Title : Solar Collectors,. ... Tedlar 20 and Halar 500) with strong absorption in the UV and two commercial films containing UV absorbers (Tedlar UT ...
... Descriptors : *SOLAR ENERGY, *THRUSTERS, ABSORBERS(EQUIPMENT), FOCAL PLANES, THERMAL PROPULSION SYSTEMS, SOLAR ...
... RATES, ABSORBERS(MATERIALS), RAYLEIGH SCATTERING, ABSORPTION SPECTRA, CARBON DIOXIDE, HEAT FLUX, OZONE, SOLAR ...
... Title : Optical Properties of Solids Relevant to Photothermal Solar Energy,. ... Abstract : The notion of an ideal photothermal absorber is examined and ...
... The carbon black serves as a UV screen absorber of solar energy. The design of the collector and that of a conventional collector are shown. ...
... simultaneously as absorber and heat transfer medium resulted in a considerable performance enhancement against conventional solar collectors. ...
... stability information is reviewed; information on surfaces is related to four basic surfaces for passive thermal control: (1) solar absorber, (2)solar ...
... describes two methods for imaging an absorber used as a new sensor in determining the location of the focal spot for a solar concentrator. ...
... COMPUTER PROGRAMS, *FOCUSING, *SOLAR COLLECTORS, OPTIMIZATION ... TECHNIQUES, IMAGES, ABSORBERS(EQUIPMENT). ...
Solar collector utilizing spray system, effectively removes heat from absorber plates without use of
NASA Technical Reports Server (NTRS)
A solar collector is disclosed comprising an elongate absorber centrally arranged in an evacuated, transparent, circular-cylindrical tube provided with a reflector in the form of a 1/3-circular cylinder in contact with the absorber.
A method is described for improving the selectivity of a black copper oxide absorber surface which comprises treating the surface with a solution containing chromate ions and ammonium ions. Copper black surfaces when so treated and solar absorbers with such surfaces are included.
A solar absorber made of transparent foils consisting of a polyamide and polyethylene laminate was investigated. Because of the transparency of the layers, the fluid between them is absorbant and, in this case, runs between them. It was shown that the lam...
A solar collector unit is described including a corrugated absorber element coated with a reflectively selective coating; a plurality of thin, low mass, low thermal conductivity, thermal isolating elements for supporting the absorber element; and an insulation medium spaced from and generally parallel to the ...
Analysis of heat transfer in solar collectors with heat pipe absorbers is compared to that for collectors with flow through absorbers. Both pumped and thermosiphon systems that produce hot water or other heated fluids are discussed. In these applications the heat pipe absorber suffers a heat transfer penalty ...
Titan's organic haze is the the dominant absorber of solar energy in Titan's atmosphere, creating an
Aerosols in the atmosphere alter the radiative balance of the Earth by reflecting or absorbing solar
Innovations in reflectometry techniques are described; and the development of an absorbing selective
... on the durability of solar collectors. Factors such as design, fabrication, materials of construction, seals and sealing techniques and absorber plate ...
The efficiency of the conversion of solar energy into electrical energy by solar cells is improved if the incident solar radiation is first absorbed by an intermediate absorber. The reemitted radiation is directed onto the solar cell. This mode of operation is known as ...
A lightweight and durable solar collector employing a fibrous absorber is described. Sufficient fiber mass may be used to blanket all radiation. The absorber is disposed between a transparent cover and a heat insulating shield behind which may be a rigid collector container. A reflector disposed between the ...
A solar heating device is provided for heating a liquid used in the device as the refractive medium. A lens and a heat absorbing member carry the liquid and are connected together so that the liquid may be communicated therebetween. The lens concentrates the solar energy on the heat absorbing member when the lens ...
In this paper, heat transfer and flow in a composite solar wall with porous absorber has been studied. The unsteady numerical simulation is employed to analyze the performance of the flow and temperature field in the composite solar wall. The excess heat is stored in the porous absorber and wall by the incident ...
E-print Network
A solar collector is described comprising: a first window for passing solar insolation; a layer of material located on the interior surface of the first window, the layer of material comprising means for supporting and distributing a fluid to be vaporized therefrom while passing at least in part the solar insolation; an ...
The definition, fabrication, and specification of solar selective absorber surfaces are discussed. Also, the nature of solar radiation and thermal radiation in relation to selective surfaces is considered. (WHK)
A relatively thin solar heat collector is disclosed, for solar heat collecting units, having a series of discontinuities in its surface in the form of projections, increasing surface area for absorption and heat transfer.
Apr 26, 2008 ... Coatings for Solar Absorber Applications in Low Earth Orbit November ... there is an interest in collecting solar energy for use in heat ...
pictured) and a conventional water heater. A fluid-ethylene glycol and water-is circulated through the collectors to absorb solar heat. The ...
... far less than that of competing solar cell powered heaters. ... a spherical receiver with a selective solar energy absorbing coating, potassium or ...
heat inlet surface of solar Stirling convertors. In this application, the key role of the cermet coating is to absorb as much of the incident solar energy ...
technologies (thermal absorbers, solar concentrators and solar cells) are under study for large scale solar energy conversion ...
media for solar pumping have been identified and investigated i n the program. ..... a solar-pumped dye laser (like our laboratory system) in space. ...
The efficiency of a flat plate solar collector can be greatly enhanced by the use of a selectively absorbing layer, that is, a surface with high absorptance for the solar spectrum and low emittance for thermal radiation. From various methods known from li...
Photographs, diagrams, tables, and graphs are presented on various aspects of solar collectors, reflector life tests, heat pipes, solar absorber coatings, cost analysis of transfer loop systems, cooldown of absorber tubes, thermal conductivity of insulation, and thermal storage. (WHK)
By surrounding the absorber-heat exchanger component of a solar collector with a glass-enclosed evacuated space and by providing the absorber with a selective surface, solar collectors can operate at efficiencies exceeding 50% under conditions of delta T/...
The solar radiation exploited by solar exhaust air windows was measured at a building facing four main directions. The windows were not constructed as optimal radiation absorbers and the heat gain stood in a range of 3 to 10% of the heat consumption, depe...
A solar energy collector is disclosed. The collector has a frame , a window and an absorber enclosed by the frame and a combined heat trapping and heat shielding arrangement between the window and the absorber. The trapping and shielding arrangement consists of a series of vanes extending from side to side of the frame and , in a heat ...
A solar energy absorber, including a tubular absorber surface through which a fluid passes for transferring thermal energy layer is vacuum or air for minimizing thermal energy losses through convection. A clear liquid passes between two intermediate layers of glass for transferring, by means of conduction, the thermal energy ...
In a solar heat collector, a corrugated screen or a transverse series of perforated plates is on the underside of a heat absorber plate and heated by conduction and radiation from the absorber plate. The screen or perforated plates increase the surface area for heat transfer, especially to air, and produce turbulence of the heat ...
The optical characterization of solar absorbers for thermal solar collectors is usually performed by measurement of the spectral reflectance at near-normal angle of incidence and calculation of the solar absorptance from the measured reflectance. The solar absorptance is, however, a function of ...
PubMed
Building construction having at least one wall with an inner surface and an outer surface is described. A heat energy absorbing member is disposed outwardly of the outer surface for absorbing solar heat energy. Heat radiating members are disposed inwardly of the inner surface, and heat transfer elements extend through the wall. The ...
A solar collector is disclosed comprised of a frame and a plurality of tubular collector elements. Each collector element is comprised of an outer transparent tube, a metallic absorber tube, and an intermediate transparent tube which encloses the absorber tube. The absorber tube is coated with an absorptive coating ...
A solar energy utilization system is described employing a glazed, insulated, collector box that houses a plurality of swingably mounted, conduit type, energy absorber assemblies; together with associated, arcuately shaped booster mirrors for collecting solar rays and reflecting them toward the absorber assemblies; ...
The feasibility of using two cheap packed bed absorbers for solar air heaters have been investigated. The absorbers consist of iron shavings and iron wires. Both of these materials are available in abundance as scrap and are extremely cheap. Two solar air heaters using these materials for ...
A study was performed to aid in the development of accelerated test methods needed for the evaluation of absorber materials and to incorporate the methods into draft standards for consideration as consensus standards by the American Society for Testing an...
the dominant solar absorber, water vapor, has been revised several times in the last 20 years, and it may not be right yet especially the all-important ...
This solar energy collector includes a base and an outwardly inclined collar having a mirror finish carried by the base. An energy absorbing pine tar substance for absorbing solar energy is carried by the base. Copper tubing arranged in a generally spiral pattern provides a heat exchange conduit located within the ...
There is provided a solar collector comprising a heat pipe having an evaporator section and a condenser section, together with an absorber plate thermally conductively connected to the evaporator section, one side of the absorber plate being provided with a layer for the selective absorption of incident solar heat. ...
A light weight, low cost, non-corroding, high efficiency solar energy collector is comprised of an absorber plate which is adapted to absorb solar energy in the form of heat and to transfer by conductance the heat to a heat exchange medium. The absorber plate has disposed therein a highly heat ...
A solar energy refrigeration system is described comprising a base support, a first reflector defining a concave parabola of revolution having first and second flared ends, an axis of revolution and a central saddle region, said reflector mounted on said base support, means for absorbing solar energy mounted on said base support and ...
A focussing solar collector is described including a solar reflector and a solar absorber disposed to receive the solar radiations directly and those reflected from the reflector, characterized in that the reflector is of a cylindrical configuration having a semi-circular cross-section of ...
Development of a solar absorber under technological aspects of production, assembly and application including passive components of same superficial structure and color. Development of a solar absorber, at the same time to be used as room closing, heat an...
A solar energy receiving surface comprises a flat base plate of aluminum to which are affixed aluminum absorbers that are semielliptical or oval in shape connected to form a honeycomb-like pattern. The configuration of the absorber produce maximum solar yield per day and season by acting as a normal plane to the ...
A panel for selectively absorbing solar energy is disclosed comprising an aluminum substrate, a layer of zinc thereon, a layer of nickel over the zinc layer and an outer layer of solar enrgy absorbing nickel oxide or a copper substrate with a layer of nickel thereon and a layer of solar energy ...
This invention utilizes a solar radiation absorbing fluid (I.E., a black fluid) for direct solar energy to thermal energy transfer. The unique structure of the several disclosed embodiments of this invention provides for a selected distribution and a selected depth of the absorbing fluid in the ...
Methods of and considerations in the measurement of solar reflectance or absorptance of materials for solar absorbers are discussed. Graphs of extraterrestrial solar spectral irradiance and terrestrial solar spectral distribution for air masses are presented. Techniques for the direct ...
A solar radiation absorber has absorbing means within a gas filled housing and an overlying radiation transparent plate spaced therefrom. Ribbons of thin material are disposed between the absorbing means and the plate to restrict convective heat losses.
Solar radiation absorber is described having absorbing means within a gas filled housing and an overlying radiation transparent plate spaced therefrom. Ribbons of thin material are disposed between the absorbing means and the plate to restrict convective heat losses.
An air system is described for the collection and utilization of solar energy. Tubular solar collectors are made with a transparent glass tube having a cylindrical outer wall, spaced and sealed at one end to a cylindrical absorber tube that has a solar energy absorbing surface. The sealed space ...
A solar absorber panel assembly has a pair of substantially parallel plates sealed together at their perimeter. A raised integral header is formed in one of the plates. An external header is in fluid communication with the integral header and is spaced from and mechanically connected to the plates. A solar collector assembly includes ...
A solar energy collector is shown which is comprised of an underlying support, a support surface, and a combined reflector and heat absorber. The combined reflector and heat absorber is formed from a continuous sheet of material to provide contiguous parabolic reflectors, each reflector having an upstanding heat ...
A solar absorber to be mounted on the roofs of buildings, the absorber having the form of a pyramid with the heat absorbing elements mounted across the upward extending faces of the pyramid and the base formed to conform to the contour of the roof so that the solar absorber ...
A solar energy collector means comprises a rectangular frame, a back wall of thin sheet material bonded and sealed at its margins to said frame, a light transmitting plate bonded and sealed to said frame in spaced relation to said back wall to provide a rigid structure, a solar energy absorber and coil means located between said back ...
Various control methods and means are disclosed for varying the temperature of vaporization of a solar-powered system so that the instantaneous power delivered by the heat engine of this system, or by a device driven by this engine, is a maximum for given conditions external to the power system, or to the power system and the driven device, respectively, while ensuring that ...
A theoretical heat transfer analysis of spectrally selective absorbers showed that spectral selectivity offers the greatest benefits for conditions of high absorber temperature and/or low values of solar irradiation. By using a two-band model of the selective absorber, it was found that the cutoff wavelength which ...
A theoretical heat transfer analysis of spectrally selective absorbers shows that spectral selectivity offers the greatest benefits for conditions of high absorber temperature and/or low values of solar irradiation. By using a two-band model of the selective absorber, the cutoff wavelength which maximizes ...
An improved absorber unit is provided for a solar collector, said absorber unit being comprised of a unitary conductive perforated sheet, folded so that segments thereof are disposed adjacent one another and perforated so that air flow is facilitated along both sides of the absorber sheet, thereby greatly ...
A clip is described for intimately engaging a solar-ray absorber in heat exchange relation with a conduit whereby a channelled absorber of fin receives the conduit in the channel. A generally C-shaped, resilient clip is applied to the back of the channel to embrace the absorber from behind and clinch it to wrap the ...
Heat transfer in evacuated-tube solar collectors with heat-pipe absorbers is compared with that for similar collectors with flow-through absorbers. In systems that produce hot water or other heated fluids, the heat-pipe absorber suffers a heat transfer pe...
A solar panel is described including photovoltaic cells encapsulated in a silicone resin containing an ultraviolet light absorber that will inhibit corrosion of metallic cell parts and resin delamination while having no substantial, adverse effect on curing of the resin.
The aim of this work is the development of a method for the elaboration of selective solar absorbers. The treatment of stainless steels by anodic oxidation in a solution of sulfuric acid and sulfides is examined for a chemical transformation of the surfac...
