Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium
Evaporative pre-cooling technology improves the cooling performance of natural draft dry cooling towers (NDDCTs) by introducing a certain amount of water into the air entrance. This paper compares the effects of different evaporative pre-cooling systems (i.e., normal wet-medium arrangement, A-frame...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21004378 |
| _version_ | 1819019009502216192 |
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| author | Jiayu Miao Suoying He Yuanwei Lu Yuting Wu Xuehong Wu Guanhong Zhang Ming Gao Zhe Geng Shuzhen Zhang |
| author_facet | Jiayu Miao Suoying He Yuanwei Lu Yuting Wu Xuehong Wu Guanhong Zhang Ming Gao Zhe Geng Shuzhen Zhang |
| author_sort | Jiayu Miao |
| collection | DOAJ |
| description | Evaporative pre-cooling technology improves the cooling performance of natural draft dry cooling towers (NDDCTs) by introducing a certain amount of water into the air entrance. This paper compares the effects of different evaporative pre-cooling systems (i.e., normal wet-medium arrangement, A-frame wet-medium arrangement and nozzle spray) on the cooling performance of a 167 m high NDDCT. Based on the meteorological data of Naomao lake in Xinjiang in 2015, two MATLAB programs were developed for case studies. This study finds all the evaporative pre-cooling systems can improve the NDDCT's cooling performance in high temperature period. In non-high temperature period, the NDDCT's performance improvement is unremarkable, and the NDDCT's cooling performance even deteriorates in the case of evaporative pre-cooling using wet medium. In the hottest month of July, the water outlet temperatures of the NDDCT pre-cooled with normal wet-medium arrangement, A-frame wet-medium arrangement and nozzle spray drop 3.2 K, 3.5 K and 3.3 K, respectively when compared with no pre-cooling counterpart. The annual average water consumption values are 39.0 kg/s, 56.4 kg/s and 124.1 kg/s, respectively. Considering all the year around performance improvement, it is suggested to use nozzle spray pre-cooling system while intermittent operation or certain-time period operation should be considered to save water. |
| first_indexed | 2024-12-21T03:28:30Z |
| format | Article |
| id | doaj.art-b69af9546cbd4e33b5e5b54c5f25ca42 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-21T03:28:30Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-b69af9546cbd4e33b5e5b54c5f25ca422022-12-21T19:17:32ZengElsevierCase Studies in Thermal Engineering2214-157X2021-10-0127101274Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet mediumJiayu Miao0Suoying He1Yuanwei Lu2Yuting Wu3Xuehong Wu4Guanhong Zhang5Ming Gao6Zhe Geng7Shuzhen Zhang8Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology & Equipment, School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, ChinaShandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology & Equipment, School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China; Corresponding author.MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing University of Technology, Beijing, 100124, China; Corresponding author.MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing University of Technology, Beijing, 100124, ChinaSchool of Energy and Power Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450002, ChinaChina Guangdong Nuclear Research Institute Co. Ltd., Shenzhen, Guangdong, 518000, ChinaShandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology & Equipment, School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, ChinaShandong Hetong Information Technology CO., LTD, Jinan, Shandong, 250013, ChinaShandong Hetong Information Technology CO., LTD, Jinan, Shandong, 250013, ChinaEvaporative pre-cooling technology improves the cooling performance of natural draft dry cooling towers (NDDCTs) by introducing a certain amount of water into the air entrance. This paper compares the effects of different evaporative pre-cooling systems (i.e., normal wet-medium arrangement, A-frame wet-medium arrangement and nozzle spray) on the cooling performance of a 167 m high NDDCT. Based on the meteorological data of Naomao lake in Xinjiang in 2015, two MATLAB programs were developed for case studies. This study finds all the evaporative pre-cooling systems can improve the NDDCT's cooling performance in high temperature period. In non-high temperature period, the NDDCT's performance improvement is unremarkable, and the NDDCT's cooling performance even deteriorates in the case of evaporative pre-cooling using wet medium. In the hottest month of July, the water outlet temperatures of the NDDCT pre-cooled with normal wet-medium arrangement, A-frame wet-medium arrangement and nozzle spray drop 3.2 K, 3.5 K and 3.3 K, respectively when compared with no pre-cooling counterpart. The annual average water consumption values are 39.0 kg/s, 56.4 kg/s and 124.1 kg/s, respectively. Considering all the year around performance improvement, it is suggested to use nozzle spray pre-cooling system while intermittent operation or certain-time period operation should be considered to save water.http://www.sciencedirect.com/science/article/pii/S2214157X21004378Natural draft dry cooling tower (NDDCT)Evaporative pre-coolingWet mediumNozzle sprayCooling performance |
| spellingShingle | Jiayu Miao Suoying He Yuanwei Lu Yuting Wu Xuehong Wu Guanhong Zhang Ming Gao Zhe Geng Shuzhen Zhang Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium Case Studies in Thermal Engineering Natural draft dry cooling tower (NDDCT) Evaporative pre-cooling Wet medium Nozzle spray Cooling performance |
| title | Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium |
| title_full | Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium |
| title_fullStr | Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium |
| title_full_unstemmed | Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium |
| title_short | Comparison on cooling performance of pre-cooled natural draft dry cooling towers using nozzles spray and wet medium |
| title_sort | comparison on cooling performance of pre cooled natural draft dry cooling towers using nozzles spray and wet medium |
| topic | Natural draft dry cooling tower (NDDCT) Evaporative pre-cooling Wet medium Nozzle spray Cooling performance |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21004378 |
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