When the transportation of natural gas in a pipeline is not feasible for economic reasons, it is first liquefied using non-conventional refrigeration techniques and then transported in super-insulated tanks. In a natural gas liquefaction plant, the liquefied natural gas (LNG) enters a cryogenic turbine at 40 bar and -160°C at a rate of 55 kg/s and leaves at 3 bar. If 350 kW power is produced by the turbine, determine the efficiency of the turbine. Take the density of LNG to be 423.8 kg/m3.

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3 bar Cryogenic turbine LNG, 40 bar -160°C, 55 kg/s