Owing to the difference of soil water in the farm, variable rate irrigation can save water as well as raising economy benefit.
依据农田内土壤含水量的差异性，有针对性地进行变量灌溉，既可节约用水又可提高经济效益。
Using condensation heat from centralized air-conditioning system for preparing domestic hot water has a remarkable economy, and can save energy and reduce thermal pollution to environment.
利用集中式空调系统冷凝热制备生活热水不仅具有明显的经济性，而且在节能的同时降低了对环境的热污染。
Through the cost analysis, emphasis condensate water recovery system in steam can save energy, make the great economy value.
通过节能分析和成本核算，说明了在蒸汽系统中冷凝水回收的效益是十分可观的。
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