Power generation and refrigeration cycles

Power Generation and Refrigeration Cycles 159 and the energy balance on the turbine is... 

THE FIRST LAW - (1 ) When work is expanded in generating heat, the quantity of heat produced is proportional to the work expended and, conversely, when heat is employed in the performance of work, the quantity of heat which disappears is proportional to the work done (Joule) (2) If a system is caused to change from an initial state to a final state by adiabatic means only, the work done is the same for all adiabatic paths connecting the two states (Zemansky) (3) In any power cycle or refrigeration cycle, the net heat absorbed by the working substance is exactly equal to the net work done. 

In the past the liquefaction of natural gas used a classic cascade cycle. The process required 120,000 horsepower for liquefaction of over 150 million standard cubic feet per day. Provisions are made for some of these cycles to use seawater for cooling. Later, baseload LNG plants utilized mixed refrigerant cycles, such as Air Products and Chemicals, Inc. s propane precooled mixed refrigerant system. Baseload plant capacities range from about 70mmscf/day to about 350mmscf/day of LNG. Baseload plants move LNG from remote sites by ship to populated areas. For example, Indonesia supplies LNG to Japan for electric power generation. ... 

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