Air is to be heated by passing it over a bank of 3 m long tubes inside which steam is condensing at 100°C. Air approaches the tube bank in the normal direction at 20°C and I atm with a mean velocity of 5.2 m/s. The outer diameter of the tubes is 1.6 cm, and the tubes are arranged staggered with longitudinal and transverse pitches of S. = S, = 4 cm. There are 20 rows in the flow direction with 10 tubes in each row. Determine (a) the rate of heat transfer, (b) and pressure drop across the tube bank,

Air is to be heated by passing it over a bank of 3 m long tubes inside which steam is condensing at 100°C. Air approaches the tube bank in the normal direction at 20°C and I atm with a mean velocity of 5.2 m/s. The outer diameter of the tubes is 1.6 cm, and the tubes are arranged staggered with longitudinal and transverse pitches of S. = S, = 4 cm. There are 20 rows in the flow direction with 10 tubes in each row. Determine (a) the rate of heat transfer, (b) and pressure drop across the tube bank,

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.8P

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Air is to be heated by passing it over a bank of 4-m-long tubes inside which steam is condensing at 100°C. Air approaches the tube bank in the normal direction at 20°C and 1 atm with a mean velocity of 5.2 m/s. The outer diameter of the tubes is 0.016 m, and the tubes are arranged staggered with longitudinal and transverse pitches of SL = ST = 0.03 m. There are 20 rows in the flow direction with 10 tubes in each row. Assume the air properties at mean temperature of 35°C and 1 atm. The air properties at the assumed mean temperature of 35°C and 1 atm are k = 0.02625 W/m·K, ρ = 1.145 kg/m3, cp = 1.007 kJ/kg·K, Pr = 0.7268, μ = 1.895 × 10−5 kg/m·s, Prs = Pr@Ts = 100°C = 0.7111. Determine the rate of heat transfer.
Air is to be heated by passing it over a bank of 4-m-long tubes inside which steam is condensing at 100°C. Air approaches the tube bank in the normal direction at 20°C and 1 atm with a mean velocity of 5.2 m/s. The outer diameter of the tubes is 0.016 m, and the tubes are arranged staggered with longitudinal and transverse pitches of SL = ST = 0.03 m. There are 20 rows in the flow direction with 10 tubes in each row. Assume the air properties at mean temperature of 35°C and 1 atm. The air properties at the assumed mean temperature of 35°C and 1 atm are k = 0.02625 W/m·K, ρ = 1.145 kg/m3, cp = 1.007 kJ/kg·K, Pr = 0.7268, μ = 1.895 × 10−5 kg/m·s, Prs = Pr@Ts = 100°C = 0.7111. Determine the pressure drop across the tube bank
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Exhaust gases at 1 atm and 300°C are used to preheat water in an industrial facility by passing them over a bank of tubes through which water is flowing at a rate of 6 kg/s. The mean tube wall temperature is 80°C. Exhaust gases approach the tube bank in normal direction at 4.5 m/s. The outer diameter of the tubes is 0.035 m, and the tubes are arranged in-line with longitudinal and transverse pitches of SL = ST = 0.09 m. There are 16 rows in the flow direction with eight tubes in each row. Assume the air properties at 250°C and 1 atm. The air properties at the assumed mean temperature of 250°C and 1 atm are k = 0.04104 W/m·K ρ = 0.6746 kg/m3cp =1.033 kJ/kg·K Pr = 0.6946μ = 2.76 × 10−5 kg/m·s Prs = Pr@Ts = 80°C = 0.7154 The density of air at the inlet temperature of 300°C (for use in the mass flow rate calculation at the inlet) is ρi = 0.6158 kg/m3. The specific heat of water at 80°C is 4.197 kJ/kg·°C. Determine pressure…
Air is to be heated by passing it over a bank of 3-m-long tubes inside which steam is condensing at 100°C. Air approaches the tube bank in the normal direction at 20°C and 1 atm with a mean velocity of 5.2 m/s. The outer diameter of the tubes is 1.6 cm, and the tubes are arranged in-line with longitudinal and transverse pitches of SL = ST = 6 cm. There are 20 rows in the flow direction with 10 tubes in each row. Assume the air properties at mean temperature of 35°C and 1 atm. The air properties at the assumed mean temperature of 35°C and 1 atm are k = 0.02625 W/m·K, ρ = 1.145 kg/m3, cp = 1.007 kJ/kg·K, Pr = 0.7268, μ = 1.895 × 10−5 kg/m·s, Prs = Pr@Ts = 100°C = 0.7111.
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