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Table 2 Experimental results of an HP integrated with flat, V-grooved, and V-trough

From: Multi-thermal performance optimization of semi-circular heat pipes integrated with various solar collector profiles

Run Heat input watts Inclination degree Mass flow rate ml/min Heat output (HO) watts Thermal resistance (TR)°C/W Thermal Efficiency (TE) % HO watts T R°C/W TE % HO watts TR°C/W TE %
1 1100 30 120 47.363 0.0503 14.4605 114.791 0.01922 34.578 43.208 0.04733 14.46
2 1100 30 135 47.98025 0.03575 15.2669 127.91 0.01337 37.85475 41.9873 0.03278 13.36
3 1100 30 150 56.288 0.0329 17.3936 136.799 0.00842 40.686 49.3834 0.02993 15.26
4 1100 45 120 51.39275 0.053375 15.16753 107.378 0.02243 32.5215 44.8955 0.050405 13.25
5 1100 45 135 52.74575 0.0449 15.99485 120.497 0.01613 35.79825 47.0248 0.04193 14.26
6 1100 45 150 61.78925 0.048125 18.14248 129.386 0.01073 38.6295 54.9011 0.045155 16.12
7 1100 60 120 49.424 0.0569 15.1946 114.86 0.02474 33.642 42.9036 0.05393 13.19
8 1100 60 135 51.51275 0.0545 16.04285 127.979 0.01799 36.91875 15.0496 0.05153 14.03
9 1100 60 150 61.292 0.0638 18.2114 136.868 0.01214 39.75 54.2532 0.06083 16.12
10 1550 30 120 71.1545 0.06965 16.6025 139.028 0.03388 31.5855 62.2294 0.065465 14.52
11 1550 30 135 72.7235 0.0551 17.0579 151.85 0.03973 34.248 64.2484 0.050915 15.07
12 1550 30 150 81.983 0.05225 18.8336 160.442 0.04468 36.465 72.9131 0.048065 16.75
13 1550 45 120 73.83425 0.072725 17.05978 126.2353 0.03067 28.881 65.0927 0.06854 15.04
14 1550 45 135 76.139 0.06425 17.5361 139.0572 0.03697 31.5435 66.9512 0.060065 15.42
15 1550 45 150 86.13425 0.067475 19.33273 147.6493 0.04237 33.7605 76.9886 0.06329 17.28
16 1550 60 120 70.5155 0.07625 16.8371 128.3375 0.02836 29.3535 61.7745 0.072065 14.75
17 1550 60 135 73.556 0.07385 17.33435 141.1595 0.03511 32.016 64.7113 0.069665 15.25
18 1550 60 150 84.287 0.08315 19.1519 149.7515 0.04096 34.233 75.3887 0.078965 17.13
19 2000 30 120 98.591 0.089 18.7445 194.45 0.08698 36.288 87.5745 0.0836 16.65
20 2000 30 135 101.1118 0.07445 18.8489 206.975 0.09283 38.33625 89.9062 0.06905 16.76
21 2000 30 150 111.323 0.0716 20.2736 215.27 0.09778 39.939 99.8270 0.0662 18.18
22 2000 45 120 99.92075 0.092075 18.95203 176.2775 0.08377 32.9355 88.8382 0.086675 16.85
23 2000 45 135 103.1773 0.0836 19.07735 188.8025 0.09007 34.98375 92.2127 0.0782 17.05
24 2000 45 150 114.1243 0.086825 20.52298 197.0975 0.09547 36.5865 102.5969 0.081425 18.45
25 2000 60 120 95.252 0.0956 18.4796 173 0.08146 32.76 84.4297 0.0902 16.38
26 2000 60 135 99.24425 0.0932 18.62585 185.525 0.08821 34.80825 88.1835 0.0878 16.55
27 2000 60 150 110.927 0.1025 20.0924 193.82 0.09406 36.411 99.6541 0.0971 18.05