Method for detecting and extracting gaseous fluid contained in a closed circuit functioning according to a rankine cycle and device using such a method

A device for detecting and extracting a gaseous fluid contained in a closed loop operating on a Rankine cycle, the closed loop comprising:

• a compression/circulation pump for a working fluid in liquid form,
• a heat exchanger swept by a hot source for evaporation of the working fluid,
• means for expanding the working fluid in vapor form,
• a cooling exchanger swept by a cold source for condensation of the working fluid,
• a working fluid tank and working fluid circulation pipes,
• wherein the device comprises:
• at least one pressure sensor and at least one temperature sensor for measuring a temperature and a pressure of the working fluid at a point of the closed loop when the closed loop is at rest, wherein the closed loop is at rest when no working fluid circulation occurs at gaseous fluid extraction equipment,
• gaseous fluid extraction equipment for extracting the gaseous fluid from the closed loop, and
• a control unit for receiving a pressure measurement from the at least one pressure sensor and a temperature measurement from the at least one temperature sensor and, as the measured pressure exceeds a threshold value for a given ambient temperature (T), activating the gaseous fluid extraction equipment for extracting the gaseous fluid in order to discharge the gaseous fluid from the closed loop.