Trilateral cycle system

A trilateral cycle system comprising:

• an expander driven by a working fluid in a gas-liquid two-phase flow, the working fluid being supplied from a heat exchanger;
• and
• a power generator connected to the expander,
• wherein the power generator is disposed at an intermediate position of a passage, which is configured to allow the working fluid in the gas-liquid two-phase flow to flow therethrough, between the heat exchanger and the expander,
• a cooling passage for cooling the power generator forms a part of the passage,
• the expander and the power generator are accommodated inside one housing,
• the housing is connected with an inlet pipe configured to allow the working fluid in the gas-liquid two-phase flow passing through the heat exchanger to flow into the housing, and an outlet pipe configured to allow the working fluid passing through the expander to flow out of the housing,
• the cooling passage is configured such that a leading end thereof communicates with the inlet pipe of the housing, an intermediate position thereof passes through the power generator, and a trailing end thereof communicates with an inlet of the expander,
• an output shaft of the expander and a drive shaft of the power generator are coaxially arranged and connected to each other,
• a shaft-applied passage configured to allow the working fluid in the gas-liquid two-phase flow to flow therethrough is formed inside the output shaft and the drive shaft, and each of the output shaft and the drive shaft is implemented by a pipe, and
• the cooling passage includes the shaft-applied passage and a communication passage that establishes communication between an outlet of the shaft-applied passage and an inlet of a fluid device of the expander.