Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating
In this article, we present a solar trough system in which the receiver pipe is enclosed in a glass cover under vacuum. The dominant radiation losses from the receiver are reduced by the use of a 'hot mirror' on the glass cover instead of a selective coating on the receiver pipe. We presen...
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| Format: | Article |
| Language: | English |
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Academy of Science of South Africa
2011-11-01
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| Series: | South African Journal of Science |
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| Online Access: | https://sajs.co.za/article/view/9952 |
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| _version_ | 1849328802487861248 |
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| author | Marie Cyulinyana Phil Ferrer |
| author_facet | Marie Cyulinyana Phil Ferrer |
| author_sort | Marie Cyulinyana |
| collection | DOAJ |
| description | In this article, we present a solar trough system in which the receiver pipe is enclosed in a glass cover under vacuum. The dominant radiation losses from the receiver are reduced by the use of a 'hot mirror' on the glass cover instead of a selective coating on the receiver pipe. We present the results for a general heat transfer model and compare the performance of a selective coating with that of a hot mirror, using simulations. We determined that a hot mirror is a viable alternative to a selective coating, and certainly allows higher temperatures of the working fluid. We recommend the use of a hybrid system, in which a selective coating is used in the part of the receiver pipe in the low temperature region, and a hot mirror is used in the high temperature region to reduce radiation losses. |
| format | Article |
| id | doaj-art-5e4d9013e1de4bcfa6b2d0d8e953fd18 |
| institution | Kabale University |
| issn | 1996-7489 |
| language | English |
| publishDate | 2011-11-01 |
| publisher | Academy of Science of South Africa |
| record_format | Article |
| series | South African Journal of Science |
| spelling | doaj-art-5e4d9013e1de4bcfa6b2d0d8e953fd182025-08-20T03:47:28ZengAcademy of Science of South AfricaSouth African Journal of Science1996-74892011-11-0110711/127 pages7 pages8186Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coatingMarie Cyulinyana0Phil Ferrer1Centre for Theoretical Physics, School of Physics, University of the WitwatersrandCentre for Theoretical Physics, School of Physics, University of the WitwatersrandIn this article, we present a solar trough system in which the receiver pipe is enclosed in a glass cover under vacuum. The dominant radiation losses from the receiver are reduced by the use of a 'hot mirror' on the glass cover instead of a selective coating on the receiver pipe. We present the results for a general heat transfer model and compare the performance of a selective coating with that of a hot mirror, using simulations. We determined that a hot mirror is a viable alternative to a selective coating, and certainly allows higher temperatures of the working fluid. We recommend the use of a hybrid system, in which a selective coating is used in the part of the receiver pipe in the low temperature region, and a hot mirror is used in the high temperature region to reduce radiation losses.https://sajs.co.za/article/view/9952solar troughselective coatinghot mirrorefficiencyreceiver coating |
| spellingShingle | Marie Cyulinyana Phil Ferrer Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating South African Journal of Science solar trough selective coating hot mirror efficiency receiver coating |
| title | Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating |
| title_full | Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating |
| title_fullStr | Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating |
| title_full_unstemmed | Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating |
| title_short | Heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating |
| title_sort | heat efficiency of a solar trough receiver with a hot mirror compared to a selective coating |
| topic | solar trough selective coating hot mirror efficiency receiver coating |
| url | https://sajs.co.za/article/view/9952 |
| work_keys_str_mv | AT mariecyulinyana heatefficiencyofasolartroughreceiverwithahotmirrorcomparedtoaselectivecoating AT philferrer heatefficiencyofasolartroughreceiverwithahotmirrorcomparedtoaselectivecoating |