抄録
The world's population is expected to increase to ten billion in the 21^<st> century, accompanied by a rapid increase of energy consumption. This will bring about a shortage of fuel resources and global warming caused by CO_2 emissions. The basic solution to these problems will be to use energy resources more efficiently and to switch from fossil fuels to nuclear energy and renewable energy. On this purpose in this paper we will propose the hydrogen-fired Rankine cycle as similar to (C) type and then we will make modification of it by increasing the performance characteristics and efficiencies with (reheating, regenerative and recuperation) of the working fluid of the bottoming cycle respectively, and in this case we will present two types (C1 and C2). In case of type C2 the cycle will be called as "New Rankine Cycle". And as well these cycles will be compared with the Rankine cycle (C) for hydrogen-fired, to show the advantages of the performance characteristics of the new design which the highest value of exergy efficiency can be reached to 63.58% as HHV at 1700℃ of the combustor discharge temperature. These cycles will be analyzed by thermodynamic theory as well as for exergy analysis, and the performance characteristics of the cycles will be studied. The effects of the different parameters such as the discharge temperatures and pressures of the combustors of high and low pressure and also the effect of pressure of the condenser on the performance of the cycles will be also clarified.
