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The hot and cold inlet temperatures to a concentrictube heat exchanger are
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Fundamentals of Heat and Mass Transfer
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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.arrow_forwardSteam 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. 19.81arrow_forwardPlease quicklyarrow_forward
- Heat transferarrow_forwardSteam 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 @ 3.4 kg/s ấnd the temperature difference between the two fluids at the exit is 57°C, assume LMTD correction factor of 1.0, for each tube: length = 2.7 m, diameter = 2.4 cm. What is the overall heat transfer coefficient (W/m¯.°C)? Select bne: O A. 2234.41 O B. 3859.43 C. 3385.47 D. 2979.21 E. 2606.81arrow_forwardQuestion B3. A concentric tube heat exchanger is used to cool lubricating oil for a large diesel engine. The inner tube is constructed of 2 mm wall thickness stainless steel, having thermal conductivity 16 W/m K. The flow rate of cooling water through the inner tube (radius = 30 mm) is 0.3 kg/s. The flow rate of oil through the tube (radius = 50 mm) is 0.15 kg/s. Assume fully developed flow, if the oil cooler is to be used to cool oil from 90°C to 50°C using water available at 283K. The overall heat transfer coefficient is 21.9 W/(m2K). Calculate the length of the tube required for parallel (co-current) flow, and the length of the tube required for counter-current flow. The average heat capacity for oil is 2.131 kJ/(kgK) and for the water 4.178 kJ/(kgK).arrow_forward
- I need the solution in hand writingarrow_forwardPinch temperature at hot stream is 70C, while at cold stream is 60Carrow_forwardIn a concentric, two-pipe heat exchanger, the pressurized water with a flow rate of 12000 kg/h is heated from 35 °C to 120 °C with a flow of 5000 kg/h with superheated water (pressurized water) at 300 °C inlet temperature. The total heat transfer coefficient is 1500 W/m'K. Use TS 1996 Heat Exchangers standard for design. Where the required heat exchanger surface area is 3.2m a)Calculate the pressure drop. b)Find the insulation thickness to be made outside the body.arrow_forward
- Engine oil (c_p=2100 J/(kg-K) ) is heated from 25 °C to 70 °C. The oil flows at a rate 0.5kgsec in a 2cm diameter thin walled copper tube. The oil is heated by condensing steam at 100oCon the outside of the 2cm tube in a counter-flow heat exchanger. The latent heat of vaporization for the steam is h_fg=2257kJkg. The overall heat transfer coefficient is U=1000WM2K, based on the 2cm diameter thin walled copper tube area. A) Find the overall heat transfer rate to the oil. B) Find the log-mean temperature difference.arrow_forwardA single-shell, four-tube-pass heat exchanger is used to cool water flowing at 14 kg.s¹ entering at 18°C using ammonia with a mass flow rate of 18 kg.s¹ and an entry temperature and pressure of -12°C and 650 kPa, absolute, respectively. The heat exchanger is to use the ammonia in the liquid form, so no evaporation can be allowed. At 620 kPa, absolute pressure, ammonia evaporates at 10.5°C. The overall heat transfer coefficient of the heat exchanger is 568 W.m2 and the heat transfer surface area is 75 m². Determine the outlet temperatures of the hot and cold streams. Identify whether the heat exchanger, operating under the conditions shown, satisfies the rec irement that the ammonia remains liquid throughout the process. Sources for any researched material properties must be properly referencedarrow_forwardPlease quicklyarrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning