A compact cross-flow water-to-air heat exchanger with both fluids (air and water) unmixed (Fig. below). The heat exchanger has 50 tubes of internal diameter D_i = 0.6 cm and length 75 cm in a closely spaced plate-finned matrix. Hot water enters the tubes at 95°C at a rate of 0.55 kg/s and leaves at 50°C. Air flows across the heat exchanger through the interfin spaces and is heated from 20°C to 50°C. Determine the overall heat transfer coefficient U_i of this radiator based on the inner surface area of the tubes. The cp for water is 4.20 kJ/kg.°C.
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Calculate the mass flow rate of water: Mass flow rate of water = 0.55 kg/s Show more…
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