I am interested in ORC-system. If I look to the hp-diagrams of the main working fluid they do not need a superheating stage, but in reality I saw that in many ORC the fluid is also superheated. Could you explain me the reason of that?
Thank you.
Organic rankine cycles use organic compounds that have very low bpiling points, mostly well below freezing point of water. In short, the working fluids in ORC are all in their superheated range.
if i understand your question.reason of this work increase life of turbine.because if inlet fluid's turbine was not saturate vapor when fluid pass turbine we have fluid whit liquid,in other hand we have liquid more than vapor it is dangerous for turbine and maybe create corrosion on fin turbin's
When Hamid says "corrosion", he actually means "erosion", a common enough error!
hi doctor Raghavan .yes.i study about this.your statement is true.thank u.
i. H
hallo Hamid. Thank you for the answer.during the expansion the organic fluid does not go in the liquid/vapor phase but is superheated because of the slope of the saturation curve. So, Hamid, you mean the fluid shall be slightly superheated at the inlet of the turbine in order to exclude the presence of drop at this stage. Correct? Regard. Serena
hello Serena.i think your statement isn't true.i said at inlet of the turbine fluid shall be superheated vapor because if we have isotropic process at turbine,most of fluid outlet of the turbine is vapor.this outlet is suitable for cycle because prevent erosion of turbine fin's.if fluid at the inlet of turbine must be saturated vapor(be on the saturation curve)when fluid pass isotropic process at the outlet of turbine we have liquid(because of the saturation curve). i say that fluid must be superheated because of :1. prevent erosion to increase life of turbine 2.increase efficiency of cycle
thank u
If you fluid is above the critical point, then it eperates in the superheated region
in fact, the superheat is not good for the ORC efficiency. But, to safty of expander, the 10-15 superheat degree is necessory for the dry refrigerator, if the working fluid is wet refrigerator, then the superheat degree should more than 20 degree. This is good for ORC application in the vehicle engine.
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