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The process of isothermal compression of gasses at sub-atmospheric pressures through regulated water injection in Braysson cycles

Applied Thermal Engineering
Publication Date
DOI: 10.1016/j.applthermaleng.2010.11.033
  • Isothermal Compression
  • Water Injection
  • Braysson Cycle


Abstract Although the Braysson cycle constitutes the ideal limit for the Combined Cycle Power Plants, its actual implementation has not been achieved due to the difficulty in building the required isothermal compressor. The present study proposes the incorporation of regulated water injection during the final compression, which could maintain the temperature constant due to the evaporation. The analysis for the thermodynamic implications of the injection on the ideal version of the Braysson cycle indicates that the (ideal cycle) efficiency reduction will be minimal. The study provides an analysis for the water injection rate that will permit such a process and shows that the additional work needed to drive the process will not be affected significantly by the injection. In addition, it shows that the minimum temperature of the Braysson cycle will be lower than the corresponding level of the conventional (Gas–Steam turbine Combined cycle plants), something that could improve the efficiency as well. Finally it shows that the process may be expressed by a polytropic relationship of the type pv β = constant, where β ≈ 1.06.


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I show that water vapor is decomposed by photolysis in H2 and O, both lighter than air will rise in altitude (Air 20/29 = 1, H2 = 2/29 = 0.06 and O = 16/29 = 0.55), the lighter hydrogen will be placed above (it will be called a positive cloud) the monoatomic oxygen will be placed underneath (it will be called a negative cloud) Due to the opposition of two mechanical forces (ascending and descending air currents), they agitate and friction at a favorable rate, combine in a real explosive chemical reaction; Form water (what is called synthesis of water), the cycle is thus:
I want to say that:
(Lightning + Thunder + Rain = one operation). The light arrives first (see speed of light), the thunder (noise of the explosion) second (see speed of sound) and finally the raindrops whose speed of fall is lower than those of light and sound.
Everything is explained lightning, thunder and rain.
All my thanks.