10 kg/s oil (the density, specific heat, thermal conductivity, viscosity of oil are 920 kg/m, 2.1 kJ/kg C, 0.14 W/m-K, 5x10- 3 Pa-s, respectively) is heated in a plate exchanger contains 51 stainless steel plates (k= 16 W/m K), from 20 C to 50 C. Heating is carried out with steam condensation. Heat transfer coefficient for steam side is 12000 W/mK. Spesifications of plate heat exchanger are: Width of plate (W)=0.3 m Gap between two plates (a)=3 mm Thickness of plate (Ax)=3 mm The effective area is equal 1.5 times the projected area. Calculate the length of plate.