| 摘要: |
| 冷冻水系统大温差设计对空调系统节能具有重要意义。配套使用空气处理机组也需采用大温差设计，达到节能效果，本文在空气处理机组换热机理的理论基础上，分析了冷冻水大温差对空气处理设备换热性能的影响。通过优化表冷器管形、回路等方法，采用焓差法实验对比了大温差工况下不同管形、不同回路、不同翅片片距等对表冷器性能的影响，在相同换热截面下，大温差空气处理机组较常规机组能耗降低约20%，并在此基础上，提出了大温差表冷器优选结构方案，采用高效内齿形换热管，4排高效换热管可与6排光管表冷器达到相同冷风比，且整机能耗低约5%，为大温差设计的应用和实践提供借鉴和参考。 |
| 关键词: 大温差 空气处理机组 表面传热系数 回路 |
| DOI： |
| 投稿时间：2021-01-05 修订日期：2021-03-28
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| 基金项目:国家重点研发计划（2018YFC0705000）资助项目。 |
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| Optimal Design and Experimental Verification of Heat Transfer Capacity of Heat Exchanger of in Large Temperature Difference Air Handling Unit |
| Xu Yanni,Zhuo Mingsheng,Zhang longai,He Weiguang |
| (Gree Electric Appliances Inc. of Zhuhai;Gree Electric Appliances Inc. of Zhuhai;State Key Laboratory of Energy Conservation for Air Conditioning Equipment and System Operation) |
| Abstract: |
| A chilled water system with large temperature difference is essential for the economical operation of air conditioning. This design also enables air handling units (AHU) to achieve an energy-saving effect. Based on the mechanism of the heat exchange in AHU, this study analyzes how chilled water with large temperature difference affects the heat transfer of AHU. Experiments are conducted to test the influence of large temperature difference of chilled water in the cooling coils with differential enthalpy method. The pipe shapes and flow routes are optimized. The performances of the cooling coils are compared for different coil pipe shapes, flow routes, and fin spacings. Using the same heat exchange section, the AHU of this design reduces the energy consumption by approximately 20% compared with a conventional unit. Furthermore, a preferable scheme is proposed to reduce energy consumption by 25%, in which cooling coils are composed of four-row high-efficiency inner threaded pipes that have the same ratio (cooling capacity to airflow) as those of six-row non-threaded pipes. The results provide applicable and practical cases for the design of AHU with large temperature difference. |
| Key words: large temperature difference air handling unit coefficient of heat transfer flow path |
