| 1. |
- Brogren, M, et al.
(author)
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Optical efficiency of a PV-thermal hybrid CPC module for high latitudes
- 2000
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In: SOLAR ENERGY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0038-092X. ; 69:1-6, s. 173-185
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Journal article (peer-reviewed)abstract
- The advantage of PV-thermal hybrid systems is their high total efficiency. By using concentrating hybrid systems, the cost per energy produced is reduced due to simultaneous heat and electricity production and a reduced PV cell area. In this article, the
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| 2. |
- Helgesson, A, et al.
(author)
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Angular dependent optical properties from outdoor measurements of solar glazings
- 2000
-
In: SOLAR ENERGY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0038-092X. ; 69:1-6, s. 93-102
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Journal article (peer-reviewed)abstract
- A method for careful outdoor characterization of the angular dependent solar transmittance of solar glazing is developed and used for investigating the performance of structured and antireflection treated glass. Two identical collectors are series connect
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| 3. |
- Hellström, Bengt, et al.
(author)
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The impact of optical and thermal properties on the performance of flat plate solar collectors
- 2003
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In: Renewable Energy. - 0960-1481. ; 28:3, s. 331-344
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Journal article (peer-reviewed)abstract
- The impact of the optical properties on the annual performance of flat plate collectors in a Swedish climate has been estimated with the MINSUN program. The collector parameters were determined with a theoretically based calculation program verified from laboratory measurements. The importance of changes in solar absorptance and thermal emittance of the absorber, the addition of a teflon film or a teflon honeycomb, antireflection treatment of the, cover glazing and combinations of these improvements were investigated. The results show that several improvements can be achieved for solar thermal absorbers. A combined increase in absorptance from 0.95 to 0.97 and a decrease in emittance from 0.10 to 0.05 increase the annual performance with 6.7% at 50 degreesC operating temperature. The increase in performance by installing a teflon film as second glazing was estimated to 5.6% at 50 degreesC. If instead a teflon honeycomb is installed, a twice as high performance increase is obtained, 12.1 %. Antireflection treatment of the cover glazing increases the annual output with 6.5% at 50 degreesC. A combination of absorber improvements together with a teflon honeycomb and an antireflection treated glazing results in a total increase of 24.6% at 50 degreesC. Including external booster reflectors increases the expected annual output at 50 degreesC to 19.9-29.4% depending on reflector material. (C) 2002 Elsevier Science Ltd. All rights reserved.
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| 4. |
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| 5. |
- Miniotas, A, et al.
(author)
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Gigantic resistivity and band gap changes in GdOyHx thin films
- 2000
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In: APPLIED PHYSICS LETTERS. - : AMER INST PHYSICS. - 0003-6951. ; 76:15, s. 2056-2058
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Journal article (peer-reviewed)abstract
- In this letter we show that GdOyHx thin films allow one to tailor the electric and the optical properties by controlling the hydrogen and oxygen content. By changing the O/H ratio, one can shift the optical band gap from 2.4 eV in the trihydride to 5.4 eV
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| 6. |
- Nostell, P, et al.
(author)
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Ageing of solar booster reflector materials
- 1998
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In: SOLAR ENERGY MATERIALS AND SOLAR CELLS. - : ELSEVIER SCIENCE BV. - 0927-0248. ; 54:1-4, s. 235-246
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Journal article (other academic/artistic)abstract
- Anodized aluminium lacquered with polyvinylidene fluoride, anodized aluminium, vacuum evaporated aluminium foil and stainless steel have been aged up to 7 yr. It was found that anodized aluminium is not long-term durable, while the others show only slow d
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