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。
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.
循环经济是应用生态学指导的反馈式物质流程，其原则是减量化、再利用、再循环。
Recycle economy is a feedback flow guided by ecology with the discipline of 3-r (Reduce, Reuse and Recycle).
前言： 本文论述铀矿石堆浸、降低成本、提高效益的问题。讨论了搞好堆浸的决策原则和主要工作，介绍了堆浸技术经济分析、工艺流程选择和治理“ 三废”的有关方法及要求。
The heap leaching of uranium ore, its decreasing cost and increasing efficiency are expounded, and the policy-making principles for using heap leaching technology and the main work are discussed.
前言： 本文论述铀矿石堆浸、降低成本、提高效益的问题。讨论了搞好堆浸的决策原则和主要工作，介绍了堆浸技术经济分析、工艺流程选择和治理“ 三废”的有关方法及要求。
The heap leaching of uranium ore, its decreasing cost and increasing efficiency are expounded, and the policy-making principles for using heap leaching technology and the main work are discussed.
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