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46 Nicolae Bara and Marin Bica velocity. There were calculated the volume and mass air flow, and the air density at average temperature was determine using the tables. The obtained values are listed in Table 2. Nr. S, m 2 ρair kg/m 3 Table 2 Values measured to determine the air flow t′ air o C t′′ air , o C tair, m o C wair m/s Vair m 3 /s mair kg/s 1 0.0279 1.205 22 18 20 2.64 0.07385 0.089 2 0.0279 1.208 22 16.2 19.1 3.47 0.09685 0.117 3 0.0279 1.212 22 14.3 18.15 3.90 0.10891 0.132 4 0.0279 1.215 22 12.8 17.4 4.34 0.12128 0.147 The parameters obtained for the step of 0.002 were measured in order to highlight the influence of the rib step width dimensions, and then they were calculated for other values. The measurements and calculations results were listed in Table 3. No. Table 3 Values determined by calculus for different dimensions of the air flow channel Channel width t′ air °C t′′ air °C t air. m o C ρ air kg/m 3 w air m/s m air kg/s 1. 0.001 28.4 22.3 25.35 1.183 2.68 0.0792 0.025 2. 0.001 28.4 20.2 24.3 1.188 3.86 0.1146 0.025 3. 0.001 28.4 18.1 23.25 1.192 4.22 0.1257 0.025 4. 0.001 28.4 16.8 22.6 1.194 4.84 0.1444 0.025 5. 0.001 28.4 16.2 22.3 1.195 5.02 0.1499 0.025 6. 0.001 28.4 15.8 22.1 1.196 5.18 0.1548 0.025 7. 0.001 28.4 15.2 21.8 1.197 5.45 0.1630 0.025 8. 0.001 28.4 14.8 21.6 1.1986 5.89 0.1764 0.025 9. 0.0015 28.4 20.1 24.25 1.188 2.68 0.0865 0.0264 10. 0.0015 28.4 19.2 23.8 1.189 3.86 0.124 0.0264 11. 0.0015 28.4 18.4 23.4 1.191 4.22 0.1364 0.0264 12. 0.0015 28.4 17.6 23.00 1.193 4.84 0.1568 0.0264 13. 0.0015 28.4 17.1 22.75 1.194 5.02 0.162 0.0264 14. 0.0015 28.4 16.4 22.4 1.1954 5.18 0.185 0.0264 15. 0.0015 28.4 15.6 22.00 1.197 5.45 0.190 0.0264 16. 0.0015 28.4 14.2 21.3 1.1998 5.89 0.1944 0.0264 17. 0.002 28.4 19.2 23.8 1.189 2.68 0.0866 0.0272 S m 2
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 47 18. 0.002 28.4 17.6 23.00 1.193 3.86 0.1252 0.0272 19. 0.002 28.4 15.8 22.10 1.196 4.22 0.1372 0.0272 20. 0.002 28.4 14.4 21.40 1.199 4.84 0.578 0.0272 21. 0.002 28.4 14.00 21.2 1.2002 5.02 1.6388 0.0272 22. 0.002 28.4 13.8 21.1 1.2006 5.18 1.1691 0.0272 23. 0.002 28.4 13.4 20.9 1.2024 5.45 1.1782 0.0272 24. 0.002 28.4 13.00 20.7 1.2026 5.89 1.1926 0.0272 25. 0.0025 28.4 20.4 24.40 1.187 2.68 0.0881 0.0277 26. 0.0025 28.4 18.8 23.60 1.190 3.86 0.1272 0.0277 27. 0.0025 28.4 17.1 22.75 1.194 4.22 0.1395 0.0277 28. 0.0025 28.4 15.8 22.10 1.196 4.84 0.1603 0.0277 29. 0.0025 28.4 15.3 21.85 1.1976 5.02 0.1665 0.0277 30. 0.0025 28.4 14.9 21.65 1.1984 5.18 0.1719 0.0277 31. 0.0025 28.4 14.2 21.30 1.1998 5.45 0.1811 0.0277 32. 0.0025 28.4 13.9 21.15 1.2004 5.89 0.1958 0.0277 33. 0.003 28.4 21.1 24.75 1.186 2.68 0.0893 0.0281 34. 0.003 28.4 18.2 23.3 1.1918 3.86 0.1292 0.0281 35. 0.003 28.4 17.1 22.75 1.194 4.22 0.1415 0.0281 36. 0.003 28.4 15.4 21.9 1.1974 4.84 0.1628 0.0281 37. 0.003 28.4 15.2 21.8 1.1978 5.02 0.1689 0.0281 38. 0.003 28.4 14.9 21.65 1.1984 5.18 0.1744 0.0281 39. 0.003 28.4 14.4 21.4 1.1994 5.45 0.1836 0.0281 40. 0.003 28.4 14.00 21.2 1.2002 5.89 0.1986 0.0281 41. 0.0035 28.4 21.2 24.8 1.185 2.68 0.0898 0.0283 42. 0.0035 28.4 19.1 23.75 1.19 3.86 0.1299 0.0283 43. 0.0035 28.4 18.4 23.4 1.191 4.22 0.1422 0.0283 44. 0.0035 28.4 16.2 22.3 1.195 4.84 0.1636 0.0283 45. 0.0035 28.4 15.8 22.1 1.1966 5.02 0.1699 0.0283 46. 0.0035 28.4 15.3 21.85 1.1976 5.18 0.1755 0.0283 47. 0.0035 28.4 14.9 21.65 1.1985 5.45 0.1848 0.0283 48. 0.0035 28.4 14.00 21.2 1.2002 5.89 0.2000 0.0283 The measurements for a vaporizer with 2 mm rib step were performed on the Thermotechnics Laboratory stand from the Faculty of Mechanics of Craiova. Thermal efficiency was calculated for ribs having the step of 1 mm, respectively 3.5 mm, using the thermal model adopted by the specialty literature. The most pronounced air cooling occurs for the 2 mm step. So, it is confirmed the statement that the rib step has to be chosen for each type of heat exchanger, after carefully testing on laboratory stands. Graphical results are presented in Fig. 3.
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BULETINUL INSTITUTULUI POLITEHNIC D
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