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Advanced Power Generation Cycles Using Multi Component Working Fluids
P M V SubbaraoProfessor
Mechanical Engineering DepartmentIndian Institute of Technology Delhi
Customized Solutions for Maximum Benefits….
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Rankine Cycle with Organic Mixtures : Component Layout
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ORC with mixtures
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T-s plane for mixtures of R22/R114
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Mixtures of Organic Working Fluids
• A siloxane is any chemical compound composed of units of the form R2SiO, where R is a hydrogen atom or a hydrocarbon group.
• They belong to the wider class of organosilicon compounds.
• Hexamethyldisiloxane is a chemical compound with the formula O[Si(CH3)3]2.
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Hexamethyldisiloxane (MM)
Molecular Structure
Molecular Formula C6H18OSi2
Molecular Weight 162.38
Properties
Density 0.764Melting point -59 ºC
Boiling point 101 ºC
Refractive index 1.3765-1.3785
Flash point -1 ºCWater solubility insoluble
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Decamethyltetrasiloxane (MD2M)
Molecular Structure
Molecular Formula C10H30O3Si4
Molecular Weight 310.68
Properties
Density 0.854
Melting point -68 ºC
Boiling point 194 ºC
Refractive index 1.389
Flash point 62 ºC
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saturation curves in the T-x plane for the MM/MD2M mixture
xMM
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T-s diagram for MM (50%)/MD2M (50%)
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Simple Rankine Cycle with Organic Mixtures
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T-s plane for mixtures of MM/ND2M
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Superheat Cycles
• For heat exploitation at comparatively high temperature, a saturated cycle requires a working fluid with a very high critical temperature which implies an unrealistically low condensation pressure.
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Supercritical cycles
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Kalina Cycle with Subcooler
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Effect of turbine inlet pressure on first law efficiency
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The Superheat Kalina Cycle
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Comparison of Exergy destruction in various components of the Ammonia water cycles