Plant for producing mechanical energy from a carrier fluid under cryogenic conditions

A method for producing a mechanical energy from a carrier fluid under cryogenic conditions, comprising the preliminary steps of:

• preparing a cryogenic tank containing the carrier fluid at a cryogenic temperature Tcryo and a pressure level Pcryo;
• preparing a capacitive tank;
• preparing an engine body configured to host an expansion phase and a compression phase;
• supplying said capacitive tank with a mass M2 of the carrier fluid at a pressure level Prec and a supply temperature Trec;
• said method also comprising the cyclical steps of:
• raising a pressure of the carrier fluid from the Pcryo level to a Pproc level, where the Pproc level is greater than the Pcryo level and the Prec level;
• supplying the capacitive tank with a mass M1 of a working fluid at the pressure level Pproc;
• mixing the mass M1 of the working fluid and mass M2 of the carrier fluid, obtaining a mass M1+M2 of the carrier fluid at a supply temperature Tfeed and a pressure level Pfeed;
• supplying said mass M1+M2 of the carrier fluid at the pressure level Pfeed and the supply temperature Tfeed from the capacitive tank to the engine body;
• expanding the mass M1+M2 of the carrier fluid in the engine body, to lower the pressure level of the mass M1+M2 from the pressure level Pfeed to a pressure level Pex, wherein the pressure level Pex is less than the pressure level Pfeed, and to lower the temperature of the mass M1+M2 from the temperature Tfeed to a temperature Tex, wherein the temperature Tex is less than the temperature Tfeed, producing the mechanical energy;
• discharging the mass M1 of the working fluid towards an external environment;
• compressing the mass M2 of the carrier fluid to raise the pressure level of the mass M2 of the carrier fluid from the pressure level Pex to the pressure level Prec to raise the temperature of the mass M2 of the carrier fluid from the temperature Tex to the supply temperature Trec to supply said capacitive tank with said mass M2 of the carrier fluid at the pressure level Prec and the supply temperature Trec.