A liquid is to be cooled from 60 oC to 20 oC using water entering countercurrent at 15 oC and leaving at 25 oC in a double pipe heat exchanger composed of ¾” Sch. 40 and 1.5” Sch. 40 steel pipes. Entering velocity of liquid is 1.5 m/s. ho = 5000 W/m2-K; hi = 1500 W/m2-K; k of pipe = 44 W/m-K. Determine the overall heat transfer coefficient Ui in W/m2-K.
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A liquid is to be cooled from 60 oC to 20 oC using water entering countercurrent at 15 oC and leaving at 25 oC in a double pipe heat exchanger composed of ¾” Sch. 40 and 1.5” Sch. 40 steel pipes. Entering velocity of liquid is 1.5 m/s. ho = 5000 W/m2-K; hi = 1500 W/m2-K; k of pipe = 44 W/m-K. Determine the overall heat transfer coefficient Ui in W/m2-K.
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- Milk is flowing through a heat exchanger at a rate of 2000 kg/h. The heat exchanger supplies 111,600 kJ/h. The outlet temperature of the product is 95°C. Determine the inlet temperature of the milk. The product specific heat 3.9 kJ/kg°C. Answer must be 80.69°CSteam is to be condensed on the shell side of a 1-shellpass and 8-tube-passes condenser, with 50 tubes in each pass,at 308C (hfg 5 2431 kJ/kg). Cooling water (cp 5 4180 J/kg?K)enters the tubes at 158C at a rate of 1800 kg/h. The tubes arethin-walled, and have a diameter of 1.5 cm and length of 2 mper pass. If the overall heat transfer coefficient is 3000 W/m2?K,determine (a) the rate of heat transfer and (b) the rate of condensation of steam.A counter-flow double pipe heat exchanger is to heat water from 20 ⁰C to 80 ⁰C at a rate of 1.2 kgs-1. The heating is to be accomplished by geothermal water available at 160 ⁰C at a mass flow rate of2 kgs-1. The inner tube is thin walled and has a diameter of 1.5 cm. If the overall heat transfercoefficient is 640 Wm-2K-1, determine the length of the heat exchanger required to achieve thedesired heating. The specific heats of water and geothermal water are 4.18 and 4.31 kJkg-1k-1respectively.Comment on your answer in terms of its practical application.
- Hot oil is to be cooled in a double-tube counter-flow heat exchanger. The copper inner tubes have a diameter of 2 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 3 cm. Water flows through the tube at a rate of 0.5 kg/s, and the oil through the shell at a rate of 0.8 kg/s. Taking the average temperatures of the water and the oil to be 45°C and 80°C, respectively, determine the overall heat transfer coefficient of this heat exchanger.Hot oil is to be cooled in a double-tube counter-flow heat exchanger.The copper inner tubes have a diameter of 2 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 3 cm. Water flows through the tube at a rate of 0.5 kg/s, and the oil through the shell at a rate of 0.8 kg/s. Taking the average temperatures of the water and the oil to be 45 C and80 C, respectively, determine the overall heat transfer coefficient of this heat excha nger.Consider a water-to-water double-pipe heat exchanger whose flow arrangement is not known. The temperature measurements indicate that the cold water enters at 20°C and leaves at 50°C, while the hot water enters at 80°C and leaves at 45°C. Do you think this is a parallel-flow or counter-flow heat exchanger? Explain.