| 摘要: |
| 冷辐射空调以较好的热舒适性和较大的节能潜力越来越受到人们重视，但其表面易结露及单位面积制冷能力偏低影响了其工程应用。本文通过建立金属辐射板传热过程模型，分析了辐射板换热管间距排列对换热性能的影响。结果表明：对常规等管间距排列铜管辐射换热表面，在供水温度及流速分别为17 ℃和0.3 m/s时，对某1.2 m×0.4 m辐射板，当管间距由100 mm降至68 mm时，辐射板表面平均温度和最高温度分别下降0.58、0.76 ℃，温度不均匀系数分别降低3.56%、9.41%。在此基础上，设计了4排、5排、6排三类共9种变管间距排列辐射板，分别与相应等管间距排列辐射板对比，表面平均温度最高分别下降0.37、0.56、0.36 ℃，温度不均匀系数最高分别下降19.3%、23.5%、30.3%，换热管变管距排列表面温度更均匀。 |
| 关键词: 冷辐射板 变管间距 表面平均温度 温度不均匀系数 |
| DOI： |
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| 基金项目:国家自然科学基金(51878187);广州市科技计划项目(202206010132) |
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| Effects of the Heat Exchanger Tube Spacing on the Heat Transfer Performance of Cold Radiation Panels |
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Ye Lifei1, Ding Yunfei1,2, Ma Chen1
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| (1.School of Civil Engineering, Guangzhou University;2.Guangzhou Provincial Key Laboratory of Building Energy Efficiency and Application Technologies) |
| Abstract: |
| Cold radiant air conditioners are increasingly valued for their better thermal comfort and greater energy-saving potential, but their likeliness to condensate and low cooling heat flux negatively affect their engineering applications. By establishing a model of the heat transfer process of a metal radiation panel, the influences of the radiation panel heat exchanger tube spacing on heat transfer performance were analyzed. This study found that when the water supply temperature and flow rate were held constant at 17 °C and 0.3 m/s, respectively, reducing the tube spacing of a 1.2 m × 0.4 m copper tube radiant heat exchange surface from 100 mm to 68 mm resulted in a decrease of 0.58 °C in the average surface temperature and 0.76 °C in the maximum surface temperature of the radiant panel. Additionally, it resulted in a decrease of 3.56% in the temperature homogeneity coefficient and 9.41% in the maximum temperature homogeneity coefficient for a conventional equal tube spacing arrangement. Based on these findings, a total of nine types of radiation panels were designed, including three types of variable tube spacing arrangements with 4, 5, and 6 rows. Comparison with the corresponding equal tube spacing arrangement of radiation panels showed that the highest average surface temperature decreased by 0.37, 0.56, and 0.36 °C, respectively, and the highest temperature homogeneity coefficient decreased by 19.3%, 23.5%, and 30.3%, respectively. This highlights that the variable tube spacing arrangements for heat exchanger tubes lead to a more uniform surface temperature. |
| Key words: cold radiant panel variable tube spacing average surface temperature temperature homogeneity coefficient |
