Solar-selective Paint Coating Development PDF Download
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Author: W. D. McKelvey
Publisher:
ISBN:
Category : Coatings
Languages : en
Pages : 92
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Book Description
Author: W. D. McKelvey
Publisher:
ISBN:
Category : Coatings
Languages : en
Pages : 92
Get Book Here
Book Description
Author: W. D. Mckelvey
Publisher:
ISBN:
Category : Coatings
Languages : en
Pages : 72
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Formulations and process conditions for thickness-sensitive paint coatings were defined. New pigments were evaluated, but none were found which can be used as a substitute for Ferro's F-6331. Coating thermal stability, weathering and humidity resistance, and effects of pigment agglomeration size on coating optical performance were studied. Eighteen hundred square feet of aluminum foil were coated in the first large-scale application with optical properties of .cap alpha./sub s/ = 0.90 and epsilon = 0.25. This demonstrated that a high-speed laminator is capable of producing a coating with uniform optical properties by a roll coating technique. Thickness-insensitive paint coatings were developed with urethane, acrylic, and silicone binders. This type of coating combines the selective coatings currently under development and aluminum flake to provide the low emittance substrate. By varying the ratio of paint to flake, selective properties of .cap alpha./sub s/ = 0.90 and epsilon = 0.31 were achieved. The silicone systems showed the best optical performance. Aluminum powder which gave larger surface area was evaluated and found not feasible. Washing and aging techniques of the aluminum flake were studied in an attempt to improve optical performance. (MHR).
Author: M. A. McChesney
Publisher:
ISBN:
Category : Coatings
Languages : en
Pages : 60
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Book Description
The objective of this program was the development of low-cost, high-performance, solar-selective paint coatings for solar flat-plate collector (FPC) use and passive thermal wall application. Thickness-sensitive selective paint (TSSP) coating development was intended to demonstrate large-scale producibility. Thickness-insensitive selective paint (TISP) coating development was intended to develop and optimize the coating for passive solar systems and FPC applications. Low-cost, high-performance TSSP coatings and processes were developed to demonstrate large-scale producibility and meet all program goals. Dip, spray, roll, laminating and gravure processes were investigated and used to produce final samples. High-speed gravure coating was selected as the most promising process for solar foil fabrication. Development and optimization of TISP coatings was not completely successful. A variation in reflective metal pigment was suspected of being the primary problem, although other variables may have contributed. Consistent repeating of optical properties of these coatings achieved on the previous program was not achieved. However, a new method of achieving better control of coating components was conceived and preliminary development initiated. The new concept was described as an engineered pigment approach. The engineered pigment approach uses TSSP-coated metal foil particles instead of uncoated aluminum flakes in a liquid TSSP coating. The approach offers many advantages over the use of uncoated aluminum flakes: control of particle flatness, size, and thickness; control of the optical selectivity of each particle; and control of the liquid TSSP coating surrounding the coated particles.
Author: O. P. Agnihotri
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 248
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Book Description
Covers the design, production, evaluation and application of surfaces having high absorptance in the solar spectrum and low emittance at the operating temperature of the solar collection system. Presents current, significant data on the enhancement of solar collector efficiency by the use of selective surfaces.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The goal for Concentrating Solar Power (CSP) technologies is to produce electricity at 15 cents/kilowatt-hour (kWh) with six hours of thermal storage in 2015 (intermediate power) and close to 10 cents/kWh with 12-17 hours of thermal storage in 2020 (baseload power). Cost reductions of up to 50% to the solar concentrator are targeted through technology advances. The overall solar-to-electricefficiency of parabolic-trough solar power plants can be improved and the cost of solar electricity can be reduced by improving the properties of the selective coating on the receiver and increasing the solar-field operating temperature to >450 degrees C. New, more-efficient selective coatings will be needed that have both high solar absorptance and low thermal emittance at elevated temperatures. Conduction and convection losses from the hot absorber surface are usually negligible for parabolic trough receivers. The objective is to develop new, more-efficient selective coatings with both high solar absorptance (..alpha.. > 0.95) and low thermal emittance (..epsilon..
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
The roadmap to next-generation concentrating solar power plants anticipates a progression to central towers with operating temperatures in excess of 650°C. These higher temperatures are required to drive higher power-cycle efficiencies, resulting in lower cost energy. However, these conditions also place a greater burden on the materials making up the receiver. Any novel absorber material developed for next-generation receivers must be stable in air, cost effective, and survive thousands of heating and cooling cycles. The collection efficiency of a power tower plant can be increased if the energy absorbed by the receiver is maximized while the heat loss from the receiver to the environment is minimized. Thermal radiation losses can be significant (>7% annual energy loss) with receivers at temperatures above 650°C. We present progress toward highly efficient and durable solar selective absorbers (SSAs) intended for operating temperatures from 650°C to 1000°C. Selective efficiency ([eta]sel) is defined as the energy retained by the absorber, accounting for both absorptance and emittance, relative to the energy incident on the surface. The low emittance layers of multilayer SSAs are binary compounds of refractory metals whose material properties indicate that coatings formed of these materials should be oxidation resistant in air to 800-1200°C. On this basis, we initially developed a solar selective coating for parabolic troughs. This development has been successfully extended to meet the absorptance and emittance objectives for the more demanding, high temperature regime. We show advancement in coating materials, processing and designs resulting in the initial attainment of target efficiencies [eta]sel> 0.91 for proposed tower conditions. Additionally, spectral measurements show that these coatings continue to perform at targeted levels after cycling to temperatures of 1000°C in environments of nitrogen and forming gas.
Author:
Publisher:
ISBN:
Category : Solar energy
Languages : en
Pages : 600
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Book Description
Author: H. Price
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
The Solar Energy Technologies Program is working to reduce the cost of parabolic trough solar power technology. System studies show that increasing the operating temperature of the solar field from 390 to>450 C will result in improved performance and cost reductions. This requires the development of new more-efficient selective coatings that have both high solar absorptance (>0.96) and low thermal emittance (
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 564
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Book Description
