针对传统有机朗肯循环（ORC）中电泵能耗高的问题，提出一种采用热-重力驱动的交替增压型无泵模块的新型ORC系统。分析了热源温度、冷源温度和无泵模块参数对系统性能的影响，发现升高热源温度会增加系统的净输出功率和无泵模块耗气比例；增加冷源温度则导致系统净输出功率和效率下降，但对耗气比例几乎没有影响；增大供液体积区间，或在既定供液体积区间内增大初始供液体积占比，均可降低无泵模块耗气比例，从而提升系统性能。通过与传统ORC系统性能的对比，确定了新型ORC的优势工况。该研究为低品位热能发电系统的设计与优化提供了理论依据和参考。

Addressing the issue of high energy consumption in electrically-driven working fluid pumps within conventional organic Rankine cycle (ORC) power generation systems, this study proposes a novel ORC system incorporating an alternating pressure type thermal-gravitational pumping module. Through analysis of the effects of heat source temperature, cold source temperature, and pumping module parameters on system performance, it is found that increasing the heat source temperature elevates the net output power and the vapor consumption ratio of the module. Conversely, raising the cold source temperature reduces net output power and system efficiency while exhibiting negligible impact on the vapor consumption ratio. Furthermore, the vapor consumption ratio of the module can be reduced by expanding the supply volume range, or increasing the initial volume ratio within a fixed supply volume range, thus improving overall system performance. By comparing performance with the conventional ORC system, the optimal operating conditions for the novel system are identified. This research provides a theoretical basis and reference for the design and optimization of power generation systems driven by low-grade thermal energy.