Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver
Solar cavity receiver is a key component to realize the light-heat conversion in tower-type solar power system. It usually has an aperture for concentrated sunlight coming in, and the heat loss is unavoidable because of this aperture. Generally, in order to improve the thermal efficiency, a layer of...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2014/564639 |
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| author | Jiabin Fang Nan Tu Jinjia Wei |
| author_facet | Jiabin Fang Nan Tu Jinjia Wei |
| author_sort | Jiabin Fang |
| collection | DOAJ |
| description | Solar cavity receiver is a key component to realize the light-heat conversion in tower-type solar power system. It usually has an aperture for concentrated sunlight coming in, and the heat loss is unavoidable because of this aperture. Generally, in order to improve the thermal efficiency, a layer of coating having high absorptivity for sunlight would be covered on the surface of the absorber tubes inside the cavity receiver. As a result, it is necessary to investigate the effects of the emissivity of absorber tubes on the thermal performance of the receiver. In the present work, the thermal performances of the receiver with different absorber emissivity were numerically simulated. The results showed that the thermal efficiency increases and the total heat loss decreases with increasing emissivity of absorber tubes. However, the thermal efficiency increases by only 1.6% when the emissivity of tubes varies from 0.2 to 0.8. Therefore, the change of absorber emissivity has slight effect on the thermal performance of the receiver. The reason for variation tendency of performance curves was also carefully analyzed. It was found that the temperature reduction of the cavity walls causes the decrease of the radiative heat loss and the convective heat loss. |
| format | Article |
| id | doaj-art-1c875d4f78cc4da0baf96ebf840369cc |
| institution | Kabale University |
| issn | 1687-8108 1687-8124 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Condensed Matter Physics |
| spelling | doaj-art-1c875d4f78cc4da0baf96ebf840369cc2025-02-03T01:30:52ZengWileyAdvances in Condensed Matter Physics1687-81081687-81242014-01-01201410.1155/2014/564639564639Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity ReceiverJiabin Fang0Nan Tu1Jinjia Wei2State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSolar cavity receiver is a key component to realize the light-heat conversion in tower-type solar power system. It usually has an aperture for concentrated sunlight coming in, and the heat loss is unavoidable because of this aperture. Generally, in order to improve the thermal efficiency, a layer of coating having high absorptivity for sunlight would be covered on the surface of the absorber tubes inside the cavity receiver. As a result, it is necessary to investigate the effects of the emissivity of absorber tubes on the thermal performance of the receiver. In the present work, the thermal performances of the receiver with different absorber emissivity were numerically simulated. The results showed that the thermal efficiency increases and the total heat loss decreases with increasing emissivity of absorber tubes. However, the thermal efficiency increases by only 1.6% when the emissivity of tubes varies from 0.2 to 0.8. Therefore, the change of absorber emissivity has slight effect on the thermal performance of the receiver. The reason for variation tendency of performance curves was also carefully analyzed. It was found that the temperature reduction of the cavity walls causes the decrease of the radiative heat loss and the convective heat loss.http://dx.doi.org/10.1155/2014/564639 |
| spellingShingle | Jiabin Fang Nan Tu Jinjia Wei Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver Advances in Condensed Matter Physics |
| title | Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver |
| title_full | Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver |
| title_fullStr | Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver |
| title_full_unstemmed | Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver |
| title_short | Effects of Absorber Emissivity on Thermal Performance of a Solar Cavity Receiver |
| title_sort | effects of absorber emissivity on thermal performance of a solar cavity receiver |
| url | http://dx.doi.org/10.1155/2014/564639 |
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