关于OTEC循环的发展情况，由18世纪提出，并演化出三种基础循环，开式

Regarding the development of the OTEC cycle, it was proposed in the 18th century and evolved into three basic cycles, the open cycle, the closed cycle and the mixed cycle. The closed cycle has been widely studied due to its higher cycle efficiency.

The development of OTEC cycle was proposed in the 18th century and evolved into three basic cycles, open cycle, closed cycle and hybrid cycle. Among them, closed cycle is widely studied because of its higher cycle efficiency.

On the development of OTEC cycle, it was put forward in the 18th century and evolved into three basic cycles, open cycle, closed cycle and mixed cycle, among which closed cycle was widely studied for its higher cycle efficiency.