Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems
A large number of bubbles generated by the air agitation device in an external melting ice storage system can cause the disturbance of the ice–water mixture, which can enhance the heat transfer and contribute to the reduction in energy consumption. The structural design and optimization of the air a...
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MDPI AG
2022-08-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/16/5918 |
| _version_ | 1797410493710729216 |
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| author | Xiao Yang Qiyang Wang Yang Liu Dongmei Yang Yixu Wang Haiyan Qin Zedong Liu Hua Chen |
| author_facet | Xiao Yang Qiyang Wang Yang Liu Dongmei Yang Yixu Wang Haiyan Qin Zedong Liu Hua Chen |
| author_sort | Xiao Yang |
| collection | DOAJ |
| description | A large number of bubbles generated by the air agitation device in an external melting ice storage system can cause the disturbance of the ice–water mixture, which can enhance the heat transfer and contribute to the reduction in energy consumption. The structural design and optimization of the air agitation device in an external melting ice storage system is the key issue for energy savings. In this study, the influence of different orifice spacings and diameters on the distribution of the gas–liquid flow field, gas holdup, heat-transfer coefficient, and power consumption in the ice storage tank was investigated by numerical simulation. The simulated results showed that the heat-transfer coefficient of the ice–water mixture with air bubbles should be 3–5 times higher than the natural convection when the air superficial velocity is 0.03 m/s. The gas holdup was mainly affected by the orifice spacing, and the maximum varied from 5.0% to 8.2%. When the orifice spacing was less than 150 mm, the gas holdup changed a little in the horizontal direction, and the uniformity became worse when the orifice spacing was larger than 180 mm. An orifice diameter larger than 3 mm can improve the heat transfer and cause less air-compressing energy consumption, which decreased by approximately 1.62%. |
| first_indexed | 2024-03-09T04:30:53Z |
| format | Article |
| id | doaj.art-71071c9e17e548399a9d5e0960b932af |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T04:30:53Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-71071c9e17e548399a9d5e0960b932af2023-12-03T13:35:50ZengMDPI AGEnergies1996-10732022-08-011516591810.3390/en15165918Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning SystemsXiao Yang0Qiyang Wang1Yang Liu2Dongmei Yang3Yixu Wang4Haiyan Qin5Zedong Liu6Hua Chen7NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 210003, ChinaNARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 210003, ChinaNARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 210003, ChinaNARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 210003, ChinaState Grid Jinhua Power Supply Company, Jinhua 321035, ChinaCollege of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, ChinaCollege of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, ChinaCollege of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, ChinaA large number of bubbles generated by the air agitation device in an external melting ice storage system can cause the disturbance of the ice–water mixture, which can enhance the heat transfer and contribute to the reduction in energy consumption. The structural design and optimization of the air agitation device in an external melting ice storage system is the key issue for energy savings. In this study, the influence of different orifice spacings and diameters on the distribution of the gas–liquid flow field, gas holdup, heat-transfer coefficient, and power consumption in the ice storage tank was investigated by numerical simulation. The simulated results showed that the heat-transfer coefficient of the ice–water mixture with air bubbles should be 3–5 times higher than the natural convection when the air superficial velocity is 0.03 m/s. The gas holdup was mainly affected by the orifice spacing, and the maximum varied from 5.0% to 8.2%. When the orifice spacing was less than 150 mm, the gas holdup changed a little in the horizontal direction, and the uniformity became worse when the orifice spacing was larger than 180 mm. An orifice diameter larger than 3 mm can improve the heat transfer and cause less air-compressing energy consumption, which decreased by approximately 1.62%.https://www.mdpi.com/1996-1073/15/16/5918ice thermal storageair conditioning systemair agitationair holdup |
| spellingShingle | Xiao Yang Qiyang Wang Yang Liu Dongmei Yang Yixu Wang Haiyan Qin Zedong Liu Hua Chen Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems Energies ice thermal storage air conditioning system air agitation air holdup |
| title | Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems |
| title_full | Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems |
| title_fullStr | Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems |
| title_full_unstemmed | Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems |
| title_short | Flow Characteristics and Heat-Transfer Enhancement of Air Agitation in Ice Storage Air Conditioning Systems |
| title_sort | flow characteristics and heat transfer enhancement of air agitation in ice storage air conditioning systems |
| topic | ice thermal storage air conditioning system air agitation air holdup |
| url | https://www.mdpi.com/1996-1073/15/16/5918 |
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