two-stage pump

By analyzing pipeline's system structure and logical structure of steady-state operating plan, it is thought that optimization problem for steady-state operating condition can be decomposed into two sub-problems which can be resolved in sequence-oil transporting temperature optimization and pump pipe matching optimization.

通过分析管道系统结构及稳态运行方案的逻辑结构，认为可将该系统稳态工况最优化问题分解为输油温度最优化和泵管匹配最优化两个可顺序求解的子问题。

Energy Consumption Analysis of Heating System using a Low Temperature Geothermal Water Two Grade Utility with Water Source Heat Pump

采用水源热泵的低温地热水两级利用供暖能耗分析

The results indicated that the low temperature geothermal water two grade utility with water source heat pump system was economical and efficient with obvious superiority.

分析结果表明，采用水源热泵的低温地热水两级利用采暖系统运行经济节能，具有明显的优越性。

Experimental Research of a Two-stage Air-source Heat Pump for Residential Heating

双级压缩空气源热泵采暖系统实验研究

Compared with the conventional two-segment start-up, the intelligent start-up can make the unit achieve quick start-up, without over speed, independent with the head. The governor regulates automatically the guide vane and the blade in pump operation, to provide the highest efficiency.

实现智能闭环开机，与传统的两段开机相比，开机过程与水头无关，且迅速平滑。在抽水工况根据水头的变化自动调整导叶和轮叶，使机组达到最高效率。

The structural and hydraulic design method is presented low-specific-speed highspeed centrifugal pump with two-stage complex impeller.

阐述了两级复合叶轮高速泵的结构设计特点和水力设计方法.

A low temperature geothermal water two grade utility with water source heat pump used in a retrofit project was introduced in this paper.

本文介绍了采用水源热泵的低温地热水两级利用采暖方案在改造工程中的应用。