(b) The duct of an air conditioning system has rectangular cross section 30 cm x 45...
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(b) The duct of an air conditioning system has rectangular cross section 30 cm x 45 cm. Air at 18-C is flowing through the duct at 8 m/s. Using Dittus-Boelter equation, determine the filloving Equivalent diameter of rectangular duct. (2 marks) (ii) The heat transfer coefficient. (6 marks) (i) Heat leakage from the duct per unit length per unit temperature difference. (2 marks) Data: Thermal conductivity of air = 0.026 W/(m.K). Density = 1.205 kg/m Viscosity - 1.81 x 10 N.s/m? Specific heat = 1005 J/(kg K) (b) The duct of an air conditioning system has rectangular cross section 30 cm x 45 cm. Air at 18-C is flowing through the duct at 8 m/s. Using Dittus-Boelter equation, determine the filloving Equivalent diameter of rectangular duct. (2 marks) (ii) The heat transfer coefficient. (6 marks) (i) Heat leakage from the duct per unit length per unit temperature difference. (2 marks) Data: Thermal conductivity of air = 0.026 W/(m.K). Density = 1.205 kg/m Viscosity - 1.81 x 10 N.s/m? Specific heat = 1005 J/(kg K)
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