| 马建军,刘海燕.间接制冷换热器除霜方案研究[J].装备环境工程,2018,15(7):50-54. MA Jian-jun,LIU Hai-yan.Defrost of Heat Exchangers Using Secondary Refrigerant[J].Equipment Environmental Engineering,2018,15(7):50-54. |
| 间接制冷换热器除霜方案研究 |
| Defrost of Heat Exchangers Using Secondary Refrigerant |
| 投稿时间：2018-05-07 修订日期：2018-07-25 |
| DOI：10.7643/ issn.1672-9242.2018.07.011 |
| 中文关键词: 气候环境实验室 载冷剂 结霜换热器 变片距 除霜 |
| 英文关键词:climatic environmental test chamber secondary refrigerant frost-heat exchanger multiple fin pitch defrost |
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| 中文摘要: |
| 目的 对以载冷剂为冷媒，用于极端低温气候环境实验室的换热器的除霜问题进行研究，获得可行的除霜设计方 案。方法 从抑霜和融霜两个方面出发，设计包含变片距结霜换热器的内融霜和外融霜两种除霜方案，并搭建实验台对除霜方案进行实验研究。结果 变片距结霜换热器迎风面结霜严重，背风面轻度结霜，内融霜可在 3.5 min 完成，而外融霜需要 2 倍的时间。内融霜结束后继续加热换热器，并配合新风置换可在 20 min 内除去化霜后的附着水。结论 变片距结霜换热器能够有效对来流空气进行预除湿，抑制主换热器结霜，内融霜效果最好且目前以蒸汽为热源、内融霜为主、 新风吹扫为辅的除霜系统已应用于大型气候环境实验室。 |
| 英文摘要: |
| Objective To solve the frost problem of heat exchangers used in extreme low temperature climatic test chamber with liquid secondary refrigerant as coolant to obtain feasible design scheme for defrost. Methods Based on the aspects of restrain-frost and defrost, two defrost systems including variable fin spacing frost-heat exchanger were designed and studied by experiment. Results The windward side of the variable fin spacing frost-heat exchanger frosted heavily while the leeward frosted lightly. Defrost time consumed by inner-defrost system was 3.5min while out-defrost system needs 7min. In combination with replacement of refresh air, water retained on the surface of frost-heat exchanger could be removed in 20min by flowing heat after inner-frost. Conclusion The variable fin spacing frost-heat exchanger can pre-dehumidify the air and protect the main heat exchanger. The inner-defrost system with good inner defrosting effect supported by fresh air purging and with steam as the heat source is successfully applied in large climatic environmental test laboratory. |
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