... cent. Similarly, using air-to-air heat exchanger leads to an increase in the first law of efficiency in dry and humid conditions by 0.9 per cent and 36.8 per cent, respectively. Originality/value The second law of efficiency increases by 1.55 per cent and 2.77 per cent in dry and humid conditions...

...Jin-Ping Wang; Jian-Fei Zhang; Zhi-Guo Qu; Wen-Quan Tao Purpose Pressure-based methods have been demonstrated to be powerful for solving many practical problems in engineering. In many pressure-based methods, inner iterative processes are proposed to get efficient solutions. However, the number...

... where the weight and the cost are primary considerations such as cooling of photovoltaics. w=width of fin (m) x, y, z=Cartesian coordinates (m) Greek symbols ɛ=fin effectiveness =emissivity η=fin efficiency σ...

... ranging from 20 to 100, aspect ratio for 2 and 4, and bleed fraction for 2 per cent, 5 per cent and 10 per cent. The effect of each variable on the diffuser efficiency and the stagnation pressure has been studied in detail. From the study, it has been revealed that when the bleed is incorporated, the VCD...

...John Bergström; Rikard Gebart The potential for overall efficiency improvements of modern hydro power turbines is a few percent. A significant part of the losses occurs in the draft tube. To improve the efficiency by analysing the flow in the draft tube, it is therefore necessary to do...