For the DVM system, when heat exchange area of outdoor unit increased to be twice, the actual heat output increased to be maximum 138.19%.
除霜周期内实际总制热量开始随着单元室外机换热面积增大而增加，当增大到某一限值时，实际总制热量不再上升，反而下降。
参考来源 - 上海地区多联机合理制热规模及除霜能力研究Get additional heat transfer area if considering pipe wall dirt.
同时得到考虑内管壁软垢热阻影响时的附加换热面积。
参考来源 - 城市污水热能采集套管输送换热法·2,447,543篇论文数据，部分数据来源于NoteExpress
通过分析确定过冷管最小换热面积和旁通毛细管最佳长度范围。
The minimum heat transfer area of the tube for subcooling and the optimal length range of the by-pass capillary tube were determined.
采用内翅片管的目的主要是通过增加换热面积而使换热量增加。
The purpose for internally finned tube is to increase exchanger's area.
不易结垢。直通管的采用，不仅加大了换热面积，而且不易结垢。
Hard for incrustation: the adoption of straight pipe avoids the phenomenon of incrustation while enlarges the area of heat-exchanging.
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