Heat exchangers

• A parallel flow heat exchanger is used cool 4.2 kg/min of hot liquid of specific heat 3.5kJ/kg K at 130°C. A cooling water of specific heat 4.18 kJ/kgK is used for the cooling purposes at a temperature of 15°C. The mass flow rate of cooling water is 17 kg/min. calculate the following. I. Outlet temperature of liquid II. Outlet temperature of water III. Effectiveness of heat exchanger • Formulate the expression of LMTD method for counter flow heat exchanger • The size of each square is 1 m × 1 m. Determine the view factor F1-4 for the figure shown • Two large parallel plates at temperature of 427oC and 27oC respectively. Ξ (hot plate) = 0.9 and ξ (cold plate) =0.6.If a polished aluminum shield having emissivity of 0.04. Find the percentage of reduction in the radiation of the heat transfer. • 800W/m2 of radiant energy incident upon a surface, out of which 300W/m2 absorbed,100W/m2 is reflected and the remainder is transmitted through the surface.Analyze the following i)Absorptivity ii)Reflectivity iii) Transmissivity.