用自行设计的喷丝板，在单孔纺丝机上纺得了中空沥青纤维，文中讨论了这种喷丝板的设计原理。
With a special made spinnerette, hollow pitch fibers were welt and spun, the basic design principals of this spinnerette were discussed in this work.
设计的模板是单孔的。
分析了U形管管径、单孔内u形管数量及热泵机组设计进水温度对换热器换热效果的影响。
Analyses the effect of U-tube diameter, tube quantity in each hole, and the design inlet water temperature of a heat pump unit on the heat exchange capability.
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