This paper discussed the design criteria of material selection, the area of single unit, flow path, flow rate of a plate heat exchanger (PHE)in a geothermal heating system.

重点分析了板式换热器在地热供暖系统中材料、单片面积、流程、流道、流体流速等选取的原则；在综合考虑技术、经济、环境效益及节能的基础上，论述了对板式换热器优化设计的方法。

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The positive conductive plate has large area, large number of heat dissipation and ventilation holes, and good heat dissipation and ventilation effect.

该正极导电板面积大，散热孔数量多，通风散热效果好。

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The increment of the local material is favorable for increasing the heat dissipating area of the positive conductive plate, thereby improving the service life of the diode.

局部材料的增加有利于增加正极导电板的散热面积，从而提高二极管的使用寿命。

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