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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 7 number fluid 1 He 2 He 3 He 4 He 5 He 6 He 7 He 8 He 9 He 10 He 11 air 12 air 13 air 14 air 15 air 16 air 17 air 18 air 19 air 20 air 21 air 22 air 23 CO2 24 CO2 25 CO2 26 CO2 27 CO2 28 CO2 29 CO2 30 N2 31 N2 32 N2 33 N2 34 D6 35 D6 36 D6 37 D6 38 D6 39 D6 40 D6 41 D6 42 D6 43 D6 44 D6 CTP [bar] 6.503 8.472 7.292 4.895 6.086 6.005 6.663 5.984 6.025 6.015 6.976 7.133 5.39 4.857 4.084 6.148 6.8 6.312 6.449 6.645 7.088 7.011 6.423 5.986 6.636 6.13 6.211 6.337 6.312 4.000 4.014 1.093 1.124 1.257 2.517 1.134 1.265 2.532 1.255 1.257 1.26 1.265 1.285 2.383 CT T ∆P [◦ C] expansion 50 0.32 269.9 0.44 269.4 0.33 22.7 0.28 48.9 1.69 17.3 1.74 99.2 2.01 251 1.74 200.6 1.95 149.4 1.84 95 0.27 22.0 0.3 20 0.23 20 0.205 18 0.97 49.1 1.615 99.5 1.76 17.6 1.62 149.6 1.72 201.3 1.81 252.4 1.88 19.1 1.81 50.0 1.59 18.0 1.5 100.3 1.64 149.7 1.5 201.2 1.51 200.5 1.57 249.0 1.56 25.7 1 25.8 1.08 25.3 0.345 25.4 0.33 297.0 0.179 301.1 0.257 254.1 0.175 298.0 0.179 305.1 0.292 293.7 0.151 264.2 0.092 263.2 0.105 300.1 0.14 265.1 0.118 302.3 0.214 [bar] calc. Anozzle [mm2] 67 72 62 79 438 459 483 462 522 489 61 67 68 67 418 468 461 456 476 488 473 459 465 471 464 459 456 465 464 443 481 576 531 330 254 363 328 286 278 169 193 254 214 220 opening time [ms] 2.53 3.18 2.12 2.65 3.71 3.92 3.56 5.00 7.64 4.07 2.18 2.17 2.3 2.28 4.2 4.15 3.96 4.16 4.2 4.58 4.99 4.23 4.58 4.86 4.13 4.4 4.56 4.63 4.5 4.12 4.2 4.26 4.39 5.48 8.99 4.87 7.48 8.92 6.61 7.66 4.59 5.62 8.28 8.32 Table 7.1: Results from measurements. The nozzle area is calculated using the pressure drop across the expansion (not possible for siloxane D6). The opening time is inferred from the mapped signal. air had been performed, attributed to a lack of lubrication. This is not reflected in the measured estimated opening time as given in table 7.1, which is determined using the large pressure drop related to the sliding cylinder passing the venting hole. As soon as the first shot in D6 was done, the total opening time went down immediately, confirming the hypothesis that D6 acts as a lubricant. On the other hand, the estimated opening time based on the large pressure drop had increased to 5 to 9 ms. These measurements are affected by a large uncertainty due to inaccuracy of the equation of state in this thermodynamic region. 192

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