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>>13354811The energy added (and partially extracted for useful work) in the system is introduced by the boiler (or any source of heat) The amount of energy (and efficiency) of the system is chiefly dictated by the ratio of "temperature change" within the system. Go read about Carnot efficiency. Efficiency = 1 - (minimum working temperature/maximum working temperature), and please remember to use an absolute temperature scale.
The turbine has an upper limit for the temperature that the material can withstand during operation; the boiler has constraints of a similar nature. Therefore, when maximum temperatures are already being employed, it behooves you to reduce the final (minimum temperature as low as possible while still extracting more energy than you lose from your design choices caused by material selection and operational conditions).
This will often lead to multistage turbines like pic related in
>>13354848 The condesors themselves can be implemented to reintroduce their OWN collected heat energy as long as, once again, they extract more energy than they lose while doing so. Targeting the temperature of condensation as your final exit stage temperature is the best bang for your buck because you can now reduce the pressure of your working fluid. When changing from a gas to a liquid, the exchange of energy occuring with constant temperature and decreasing pressure is the most efficient, which will raise the efficiency of your turbine system overall.
