how do the two techniques increase efficiency...efficiency shows that how much o
ID: 1859675 • Letter: H
Question
how do the two techniques increase efficiency...efficiency shows that how much of the heat supplied in boiler is being converted into useful work by the turbine....in both techniques i.e, super heating and raising boiler pressure work output increases but so does the heat input, intuition suggests that we are giving more heat we are getting more work, efficiency should remain same...any one has any physical explanation? please just dont say that area enclosed in TS diagram is increased...give some intuitive explanation.Explanation / Answer
It isn't really intuitive - various science results show that the greater the temperature range from the high point in the cycle to the low point (exhaust usually) the more efficient the mechanism is in getting out the heat that was put in - or using the heat that was supplied. If you can design a turbine system so that the steam is condensing at the end it will be pulling a vacuum on the the rest of the system and increasing the range also. The problem is that the materials in the design have to cope with the superheat and raised boiler pressure (or vacuum and drips of condensate in the steam flow) which can get more expensive than the efficiency gains.
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