该系统采用了大温差变流量冷水机组、大温差定流量带部分热回收土壤源热泵机组与锅炉的组合；
The chillers adopt large temperature difference and variable flow, the heat pumps adopt large temperature difference and fixed flow and part heat recovery.
在耦合热弹性问题变分原理的基础上，导出非定常温度场热弹性平面问题的有限元法基本方程。
The fundamental equations in finite element method for unsteady temperature field elastic plane problem are derived on the bases of variational principle of coupled thermoelastic problems.
用户成为用热的主体，热网由以往的定流量运行变为变流量运行，热网特性与定流量热网特性完全不同，相应的热网控制策略也要发生变化。
The variable flow heating system is quite different from the constant flow heating system. So the relative control strategy for the heating network should be changed.
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