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Assignment – 6, , HEAT TRANSFER AND HEAT EXCHANGERS, a), , Define Fourier’s law., , b) Define:, (i), , Transmissivity, , (ii), , Black body, , (iii) Grey body, (iv) Reflectivity, c), , State:, (i), , Fourier’s law, , (ii), , Newton’s law of cooling, , (iii) Radiation and, (iv) Thermal conductivity, d) Define (i), , Thermal conductivity, , (ii), , Thermal resistance, , e), , Explain with neat sketch. Construction and working of plate type, heat exchanger. State its applications., , f), , Explain construction and working of shell and tube type heat, exchanger. A ice plant producing 2000 Kg ice per day required, the condenser. Suggest the type of condenser with justification., , g) A steel pipe of inner and outer diameter 6 cm and 8 cm respectively, has inside temperature 140°C and outside temperature 50°C. The, thermal conductivity of steel is 24 W/mk. Calculate the rate of, heat transfer through the pipe if length of pipe is, 1.5 m., h) An exterior wall of house consists 10.6 cm layer of common brick., It is followed by 3.8 cm layer of gypsum plaster and, 5.83 cm of rockwool insulation. Estimate the amount of heat, transferred through structure it., Thermal conductivity of brick = 0.7 W/mk Thermal, conductivity of Plaster = 0.48 W/mk Thermal, conductivity of Insulation = 0.065 W/mk.