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Appendix 4 : Third series of tests Test Refrigerant flow rate [kg/s] 010507A 0.046 B 0.057 C 0.071 D 0.066 E 0.054 F 0.054 G 0.068 H 0.071 030507A 0.055 B 0.070 C 0.072 D 0.074 E 0.073 F 0.070 G 0.063 H 0.062 I 0.056 J 0.070 K 0.081 L 0.082 M 0.072 N 0.085 O 0.074 P 0.072 040507A 0.062 B 0.062 C 0.063 D 0.063 E 0.063 F 0.061 G 0.058 050507A 0.065 B 0.054 C 0.045 D 0.082 E 0.081 F 0.086 G 0.071 H 0.054 Refrigerant temperature Test at the expander supply [°C] 010507A 121 B 109.8 C 122.6 D 128.1 E 143.9 F 152.2 G 136.5 H 134.4 030507A 165.2 B 141.9 C 139 D 142.7 E 110.1 F 123.2 G 134.6 H 156.4 I 145.6 J 132.2 K 112.9 L 107.7 M 129.2 N 141.6 O 101.7 P 103.8 040507A 130.1 B 128.8 C 127.9 D 128.1 E 128.1 F 132.5 G 138 050507A 130.3 B 143.5 C 160.6 D 141.2 E 130.8 F 138.9 G 132.5 H 152.4 Air flow rate [kg/s] 0.077 0.076 0.091 0.091 0.091 0.106 0.106 0.106 0.122 0.122 0.122 0.122 0.122 0.122 0.121 0.121 0.106 0.106 0.106 0.106 0.106 0.121 0.106 0.106 0.107 0.106 0.106 0.106 0.106 0.106 0.106 0.107 0.107 0.107 0.121 0.111 0.121 0.106 0.106 Refrigerant pressure at the expander supply Water flow rate in the condenser [kg/s] 0.719 0.719 0.719 0.719 0.719 0.719 0.719 0.719 0.717 0.722 0.723 0.722 0.718 0.713 0.717 0.722 0.717 0.721 0.722 0.714 0.716 0.721 0.719 0.715 0.859 0.863 0.858 0.865 0.864 0.863 0.864 0.898 0.896 0.900 0.901 0.902 0.842 0.841 0.839 Pump setting 0.5 0.75 1 0.75 0.6 0.6 0.8 1 0.6 0.8 1 1 1 1 0.7 0.7 1 1 1 1 0.8 1 0.89 0.87 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.75 0.6 0.5 1 1 1 0.8 0.6 Cold source temperature [°C] 12.24 12.12 12.04 12.01 11.98 11.95 11.94 11.93 11.27 11.23 11.21 11.21 11.19 11.18 11.17 11.16 11.11 11.08 11.06 11.04 11.02 10.98 10.96 10.94 11.66 11.62 11.6 11.57 11.56 11.5 11.51 12.58 12.24 12.15 12.1 12.05 12.03 12.15 12.02 Expander isentropic effectiveness 0.43 0.58 0.64 0.64 0.57 0.57 0.66 0.65 0.58 0.66 0.67 0.67 0.64 0.65 0.63 0.65 0.63 0.65 0.65 0.65 0.66 0.66 0.62 0.62 0.65 0.65 0.64 0.61 0.51 0.65 0.65 0.68 0.67 0.65 0.68 0.68 0.65 0.63 0.59 Second hot air source temperature [°C] 140 138.1 151.6 152.6 156.7 161.6 159.4 158.4 173.4 169.3 168.8 168.5 120.1 141.6 144 173.2 157.9 155.4 151.7 151.2 152.9 173.8 127.4 126.5 154.1 154.3 154.1 154.1 154.2 155.2 155.9 149.9 153.7 162.7 171.9 166.2 172.1 156.6 160.2 Cycle efficiency 0.026 0.049 0.062 0.058 0.044 0.043 0.059 0.063 0.042 0.055 0.057 0.061 0.056 0.056 0.052 0.056 0.068 0.071 0.062 0.059 0.069 0.070 0.057 0.059 0.058 0.056 0.052 0.043 0.026 0.057 0.059 0.074 0.070 0.070 0.073 0.071 0.064 0.062 0.056 First hot air source temperature [°C] 177.2 176.8 188.1 188.5 190.7 188.3 186.7 186.4 188.8 187.7 187.8 187.7 183.3 185.3 186.4 190.2 185.9 185.5 184.7 184.4 185.3 189.1 181.9 181.7 189.1 189.9 190.2 190.6 190.9 191.6 191.8 183.1 185.5 190.2 188.6 189.5 187.9 185.8 187.8 Carnot efficiency 0.309 0.307 0.329 0.330 0.337 0.344 0.341 0.340 0.363 0.357 0.357 0.356 0.277 0.315 0.319 0.363 0.341 0.337 0.331 0.331 0.333 0.364 0.291 0.289 0.334 0.334 0.334 0.334 0.334 0.336 0.337 0.325 0.332 0.346 0.359 0.351 0.360 0.336 0.342 Subcooling at the condenser exhaust [K] -21.14 -22.38 -23.78 -24.94 -25.46 -27.37 -26.53 -25.63 -35.3 -34.63 -33.98 -33.79 -34.26 -33.96 -35.62 -35.8 -16.57 -15.96 -15.51 -15.71 -17.86 -17.53 -17.75 -17.83 -20.11 -20.83 -21.11 -21.48 -21.78 -20.23 -19.51 -18.18 -19.07 -17.74 -19.82 -20.43 -19.93 -20.25 -18.33 Exergetic efficiency 0.084 0.158 0.189 0.175 0.132 0.126 0.172 0.185 0.116 0.153 0.161 0.173 0.200 0.177 0.163 0.154 0.199 0.211 0.188 0.178 0.207 0.192 0.196 0.204 0.174 0.168 0.156 0.128 0.078 0.170 0.177 0.228 0.210 0.201 0.203 0.202 0.178 0.184 0.163 Superheating at the evaporator exhaust [K] 38.84 19.93 21.9 29.83 52.92 60.33 37.06 33.27 71.48 40.49 36.49 38.88 10.22 23 37.92 58.32 52.97 31.25 8.86 4.16 27.37 31.89 3.19 5.6 34.28 32.83 31.62 31.91 31.79 37.14 44.16 26.08 45.83 69.86 26.41 17.9 31.36 33.67 63.64 Pressure ratio over the expander 2.7 3.37 4.1 3.73 3.19 3.24 3.81 4.15 3.14 3.9 4.09 4.16 3.88 4.03 3.67 3.83 5.03 4.92 4.73 4.61 4.74 4.98 4.45 4.52 4.6 4.44 4.13 3.51 2.8 4.44 4.58 5.28 4.94 4.69 5.39 5.26 4.54 4.28 4.09 Shaft output Asynchronous power [°C] [W] machine output power [W] 74 410 800 703 400 401 770 863 428 850 921 980 738 790 636 755 758 992 1021 1001 981 1306 797 794 785 775 721 569 301 776 762 1011 811 640 1391 1294 1239 902 601 540000 382.1 640000 736.9 820000 1188 780000 1065 669890 737.4 680000 767.2 800000 1184 830000 1275 719611 801.8 833966 1259 851360 1339 879402 1404 802622 1134 810026 1191 755426 1021 783801 1150 694675 1154 825565 1413 877928 1446 868783 1426 840134 1401 1.00E+006 1769 774893 1189 773085 1188 736310 1180 740628 1167 744804 1106 744158 939.2 745060 647.3 730526 1164 709944 1151 890365 1394 778760 1167 675326 974.7 1.11E+006 1820 1.06E+006 1708 951243 1648 787230 1269 638289 934.3 129PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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