Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber
A novel ellipse-concave plate heat pipe (ECPHP) receiver using sodium as the working fluid was developed for using on the solar thermochemical reactor. The start-up and heat transfer performance of the ECPHP under different cross-section heat fluxes were experimentally investigated. By introducing t...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X2100767X |
| _version_ | 1819319507262373888 |
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| author | Wenqi Zhang Huicong Yao Yinfeng Wang Haijun Chen Yuezhao Zhu |
| author_facet | Wenqi Zhang Huicong Yao Yinfeng Wang Haijun Chen Yuezhao Zhu |
| author_sort | Wenqi Zhang |
| collection | DOAJ |
| description | A novel ellipse-concave plate heat pipe (ECPHP) receiver using sodium as the working fluid was developed for using on the solar thermochemical reactor. The start-up and heat transfer performance of the ECPHP under different cross-section heat fluxes were experimentally investigated. By introducing the temperature difference index parameters, the start-up regime of the ECPHP was specified as the melting stage, vapor flow transfer stage, and the effective start-up stage, respectively. The effective start-up time decreased to 21.7 min when the cross-section heating flux increase to 279.3 kW/m2, the temperature of evaporator at effective start-up was about 680–770 °C. In addition, the ECPHP demonstrated good heat transfer performance in the quasi-steady stage. The temperature difference on the condensing section was less than 93.8 °C, the thermal resistance and the heat transfer coefficient were in the range of 0.054–0.083 °C/W and 670.4–1032.3W/(m2·°C), respectively. Moreover, the temperature image on the evaporator illustrated that the ellipse-concave design of the absorber could effectively relieve the hot spot on the heating surface, which would reduce the thermal stress, thereout enhancing the heat transfer stability of the receiver when applied to concentrate the solar energy. |
| first_indexed | 2024-12-24T11:04:47Z |
| format | Article |
| id | doaj.art-4dd89fca7e384084ad88c88cbd91f4ae |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-24T11:04:47Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-4dd89fca7e384084ad88c88cbd91f4ae2022-12-21T16:58:38ZengElsevierCase Studies in Thermal Engineering2214-157X2021-12-0128101604Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorberWenqi Zhang0Huicong Yao1Yinfeng Wang2Haijun Chen3Yuezhao Zhu4School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, 211816, ChinaSchool of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, 211816, ChinaSchool of Energy Science and Engineering, Nanjing Tech University, Nanjing, 211816, China; Corresponding author. School of Energy Science and Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China.School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, 211816, ChinaSchool of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, 211816, China; School of Energy Science and Engineering, Nanjing Tech University, Nanjing, 211816, ChinaA novel ellipse-concave plate heat pipe (ECPHP) receiver using sodium as the working fluid was developed for using on the solar thermochemical reactor. The start-up and heat transfer performance of the ECPHP under different cross-section heat fluxes were experimentally investigated. By introducing the temperature difference index parameters, the start-up regime of the ECPHP was specified as the melting stage, vapor flow transfer stage, and the effective start-up stage, respectively. The effective start-up time decreased to 21.7 min when the cross-section heating flux increase to 279.3 kW/m2, the temperature of evaporator at effective start-up was about 680–770 °C. In addition, the ECPHP demonstrated good heat transfer performance in the quasi-steady stage. The temperature difference on the condensing section was less than 93.8 °C, the thermal resistance and the heat transfer coefficient were in the range of 0.054–0.083 °C/W and 670.4–1032.3W/(m2·°C), respectively. Moreover, the temperature image on the evaporator illustrated that the ellipse-concave design of the absorber could effectively relieve the hot spot on the heating surface, which would reduce the thermal stress, thereout enhancing the heat transfer stability of the receiver when applied to concentrate the solar energy.http://www.sciencedirect.com/science/article/pii/S2214157X2100767XHigh-temperature heat pipeEllipse-concave plate absorberStart-up regimeHeat transfer performanceExperimental investigation |
| spellingShingle | Wenqi Zhang Huicong Yao Yinfeng Wang Haijun Chen Yuezhao Zhu Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber Case Studies in Thermal Engineering High-temperature heat pipe Ellipse-concave plate absorber Start-up regime Heat transfer performance Experimental investigation |
| title | Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber |
| title_full | Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber |
| title_fullStr | Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber |
| title_full_unstemmed | Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber |
| title_short | Experimental investigation on start-up and heat transfer performance of the high-temperature heat pipe receiver with an ellipse-concave plate absorber |
| title_sort | experimental investigation on start up and heat transfer performance of the high temperature heat pipe receiver with an ellipse concave plate absorber |
| topic | High-temperature heat pipe Ellipse-concave plate absorber Start-up regime Heat transfer performance Experimental investigation |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X2100767X |
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