| 摘要: |
| 本文通过搭建逆流式露点蒸发冷却装置，实验研究了空气入口温度、湿度和风速对露点效率、湿球效率、?效比等各性能评价指标的影响，提出了能够反映湿通道潜热交换的强弱和装置性能的适用于露点蒸发冷却的评价指标——换热放大系数。研究结果表明：进口温度为33 ℃、相对湿度为22%时，当风速从1 m/s增至3 m/s，制冷量从29.5 kW增至69.0 kW，换热放大系数呈先增后减的趋势，在风速为1.8 m/s时达到最大值；当入口空气的温、湿度不同，湿球、露点效率的变化规律与温降趋势及制冷效果不一致，不宜作为装置性能的评价指标；当相对湿度为43%、风速为1.3 m/s，进口温度由25 ℃升至40 ℃时，换热放大系数由11增至54，变化规律与降温效果一致，能够反映装置冷却性能。在高温低湿工况下，?效比大、装置节能性能好。 |
| 关键词: 露点蒸发冷却 换热放大系数 露点效率 湿球效率 㶲效比 |
| DOI： |
| 投稿时间：2020-07-08 修订日期：2020-09-26
|
| 基金项目:国家自然科学基金（5190615） |
|
| Research on Performance Evaluation Index of Dew Point Evaporative Cooler |
| Lü Jing,Huang Jiahao,Xu Haodong,Xu Tangfuyi,Liu Hongzhi |
| (College of Environment and Architecture, University of Shanghai for Science and Technology) |
| Abstract: |
| According to experiments performed on a counter flow dew point evaporative cooling device, the effects of the air inlet temperature, humidity, and air speed on the dew point efficiency, wet bulb efficiency, exergy efficiency ratio, and other performance evaluation indicators were analyzed in this study. The proposed heat transfer amplification coefficient is suitable for dew point evaporative cooling, which can reflect the strength of latent heat exchange in the wet channel and the performance of the device. The research results indicate that when the inlet temperature is 33 ℃ and the relative humidity is 22%, the air speed increases from 1 m/s to 3 m/s, the refrigeration capacity increases from 29.5 kW to 69.0 kW, and the heat transfer amplification coefficient first increases and then decreases, reaching the maximum value at an air speed of 1.8 m/s. In addition, the change law of the wet-bulb efficiency and the dew point efficiency is inconsistent with the temperature drop trend and refrigeration effect. Therefore, both wet-bulb efficiency and dew point efficiency are unsuitable as a performance evaluation index of the device. When the relative humidity is 43% and the air speed is 1.3 m/s, the inlet temperature increases from 25 °C to 40 °C, and the heat transfer amplification factor increases from 11 to 54. The change is consistent with the cooling effect, which can reflect the cooling performance of the device. The exergy efficiency ratio can be used to evaluate the energy saving of this device from the perspective of thermodynamics. Under high temperature and low humidity conditions, the exergy efficiency ratio is larger, and the device is more energy-saving. |
| Key words: dew point evaporative cooling heat transfer amplification coefficient dew point efficiency wet bulb efficiency exergy efficiency ratio |
