| 摘要: |
| 为改善空气源热泵室外翅片盘管换热器在低环境温度下沿空气流动方向结霜不均匀、首排结霜量较大进而导致热泵除霜间隔较短、制热能力下降等问题，对不同翅片片距组合的变片距翅片盘管换热器在低环温工况下运行及结霜的情况进行实验研究。结果表明：变片距翅片盘管换热器在低环温条件下可有效延长迎风面管排发生结霜堵塞的时间、对于结霜生长速度和结霜质量也有抑制作用。变片距翅片盘管换热器在结霜中后期阶段换热功率更高，在合理的翅片间距组合下，变片距翅片盘管换热器可以在不损失过多换热功率的情况下延长换热器迎风面管排结霜堵塞的时间，如样品4的平均换热功率比样品1低6.02%，而除霜间隔延长了37 min。 |
| 关键词: 空气源热泵 变片距 结霜工况 翅片盘管换热器 |
| DOI： |
| 投稿时间：2021-02-27 修订日期：2021-07-31
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| 基金项目:本文受广州市低环境温度高效空气源热泵热水机组课题（201902010021）资助。 |
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| Experimental Study on Frosting Characteristics of Three-row Finned Tube Heat Exchanger with Different Fin Pitch |
| Xiao Hongxin,Chen Guansheng,Liu Liangde,Luo Chaohong,Liu Xiangyun,Li Jianguo |
| (School of Materials and Energy, Guangdong University of Technology;Guangdong New Energy Technology Development Co. Ltd.) |
| Abstract: |
| The limitations of non-uniform frosting along the direction of air flow and large frost mass in the first row of the finned tube heat exchanger of an air-source heat pump under low ambient temperature may cause a short defrost interval, heating capacity decline, and other negative effects. To overcome these challenges, an experimental study was conducted on finned tube heat exchangers with different fin pitches operating at low ambient temperatures. The results show that finned tube heat exchangers with different fin pitches can prolong the frosting blocking time of the windward tube row. This inhibits the frosting rate and frost quality and reduces the heat loss caused by frequent defrosting, which is also beneficial for increasing the total heat transfer in one defrosting cycle. The heat transfer capacity of the finned coil heat exchanger with variable pitch is higher in the middle and later stages of frosting. Under a reasonable combination of the fin pitch, the finned coil heat exchanger with variable pitch can prolong the frosting blocking time of the windward side of the heat exchanger without losing substantial heat transfer capacity. |
| Key words: air-source heat pump different fin pitch frosting condition finned tube heat exchanger |
