In a double pipe heat exchanger handling a hot fluid from 95 °C to 85 °C with help ofcold fluid flowing counter currently from 40 °C to 60 °C. Overall dirt coefficient is450 W/m °C. Flow rate of cold fluid is 2 kg/s with specific heat value of 2562 J/kg K.Internal surface area per unit meter length of pipe is 0.1326 m-/m length of pipe.Determine the number of hairpins for this heat exchanger ( round off to the nearestwhole number).

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Answered: In a double pipe heat exchanger…

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 7.14P

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Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.
10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.
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Steam condensing at 120°C (h =2203 kJ/kg) on the shell side of (1 shell and 12 thin- walled tubes) heat exchanger. Water (18 °C, C_ =4180 J/kg-°C) enters the tube @ 3.3 kg/s and the temperature difference between fhe two Uuits at the exit is 55°C, assume LMTD correction factor of 1.0, for each tube: length =2.7 m, diamieter = 2.4 cm. What is the rate of condeusation of steam (kg/inin) Select one OA 17.66 OB.21.37 OC. 13.77 OD. 15.72 OE 1960
Steam condensing at 120°C (h, kJ/kg) on the shell side of (1 snell and 12 thin-walled tubes) heat exchanger. Water (18 °C, C, =4180 J/kg-°C) enters the tube @ 2.9 kg/s and the temperature difference between the two fluids at the exit is 42°C, assume LMTD correction factor of 1.0, for each tube: length = 2.7 m, diameter = 2.4 cm. What is the rate of condensation 2203 "fg %3D of steam (kg/min) ? Select one: А. 17.63 В. 21.99 C. 23.97 D. 15.45 Е. 19.81
A counterflow heat exchanger is designed to cool 1.2 kg/sec of oil withspecific heat Cp = 4.4 kJ/kg-K form 160 OC to 90 OC. Water for coolingis available at 23 OC and flow rate of 2.0 kg/sec. calculate the length ofa 5 cm inside diameter tubing in meters. The overall coefficient of heattransfer is 84 W/m2-K. Show your complete solution.
海引 Gmail D YouTube O... Çevir Community Downl... A Haritalar E Okuma listesi iş İÇİN Giriş yap İNGİLİZCE Hot oil (cp = 2200 J/kg.K) water in a heat exchanger with 2 bodies and 12 pipes ( cp = 4180 J/kg.K) is cooled by. 1.8 cm diameter pipes are thin-walled and made of copper. The length of each pipe passage in the heat exchanger is 3 m and the total heat transfer coefficient is 340 W/m2.K is. Water flows through the pipes with a total mass flow of 0.1 kg/s, and oil flows through the body with a mass flow of 0.2 kg/s. Water and oil enter at a temperature of 18 oC and 160 oC, respectively. Find the unit transfer coefficient (NTU) in the heat exchanger.

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