A heat exchanger consisting of one tube inserted in another one is called: a) Concentric tube heat exchanger b) Cross-flow heat exchanger c) Shell-and-Tube heat exchanger d) Compact heat exchanger
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A heat exchanger with one tube inserted inside another tube means there are two concentric tubes, one inside the other. Show more…
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Concentric tube heat exchanger - parallel flow - overall h = 650 (W/m^2K) Engine oil: - to be heated on the inside tube - from 20 (C) to 60 (C) - mass flow rate = 0.3 (kg/s) - Cp = 2100 (J/kgK) Steam: - condensing on the outside - T = 130 (C) Inside tube: - Di = 0.02 (m) - thin-walled - copper
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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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