结合工程实例，分析了联合供热系统的经济性。
The economy of the combined heating system is also analyzed with engineering example.
合理的低真空循环水供热可以提高火电厂热经济性。
The rational low vacuum circulating water heating can improve the hot economy of thermal power plant .
充分利用峰谷电时段的电价结构，提高了供热系统的运行经济性。
Making good use of electric power cost between on-peak and off-peak, heating system economy of running is enhanced.
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