New Concepts FOR Organic Rankine Cycle Power Systems

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New Concepts FOR Organic Rankine Cycle Power Systems ( new-concepts-for-organic-rankine-cycle-power-systems )

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Chapter 4 Solar field design data HCE ηopt,p θinc [◦ ] Vwind [m s-1] SM Schott PTR-70 0.75 0 0 1 SCA ET-150 DNIdes [W m-2 ] 850 Tamb [oC] 25 ∆ pb′ c′ [bar] 1 Main design data for the ORC plants W ̇net[kWE] 100 heq,st [hours] 4 Tcond [oC] 80 ∆pp,cond [o C] 15 ǫreg ηs,pumps−fans ∆ pef [% pcond ] ∆ pa′ b [bar] 0.85 ηs,turb 0.85 0.75 ηM−E 0.97 50 ∆ pfa [% pcond ] 10 0 ∆pfan [Pa] 50 Design data for the exemplary system Fluid D4 pcond [bar] 0.035 TR,c = TR,st 0.998 Tc = TST [oC] 312.6 pc = pST [bar] 14.2 Calculated design performance of the exemplary system m ̇fluid[kgs-1] 1.81 m ̇ air [kg s-1] 8.61 ηORC ηSYS,glob VRturb VST [m3] 0.251 ηSF,glob 0.71 0.18 246 65 Amirrors [m2] 704 EEED [kWhE m-3 ] 6.2 ST mfluid,st [kg] 3E4 Table 4.2: Design data for steady-state modelling, common to all the simulated systems (see also A.1 and A.2). For a detailed description of the adopted HCE and SCA technologies, see Refs. [48, 49]. ∆pb′c′: pressure drop in the SF, ∆pp,cond: pinch point temperature difference in the condenser, ǫreg: regenerator effectiveness [50], ηM−E: electro-mechanical efficiency of the generator and of all the electrical motors. ∆pef, ∆pfa, ∆pa′b, and ∆pFan : pressure drops in the regenerator (vapour side), in the condenser (process side), in the regenerator (liquid side), and in the condenser (static, air side) respectively. optimization [41, 52]. The values adopted here have therefore to be considered as indicative. 4.5.2 Flashing Rankine Cycles with Organic Fluids The main implication of the working principle presented in Sec. 4.5.1 is that the plant always operates according to a thermodynamic cycle which includes a flashing evaporation process while, 100

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