11.21 A concentric tube heat exchanger for cooling lubricating oil is comprised of a thin-walled inner tube of 25-mm diameter carrying water and an outer tube of 45-mmdiameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m² - K and the tabulated average properties.To,outToin = 100°COilWaterm, = 0.1 kg/sm, = 0.1 kg/sTw.in = 30°CTw.outPropertiesWaterOilp (kg/m3)Cp (J/kg - K)v (m2/s)k (W/m · K)1000800420019007x 10-71 × 10-50.640.134Pr4.7140(a) If the outlet temperature of the oil is 66°C, determine the total rate of heat transfer and the outlet temperature of the water.(b) Determine the length required for the heat exchanger.

Answered: Image /qna-images/answer/0ca8563f-5985-402a-ad80-618a1d606020.jpg

Answered: 11.21 A concentric tube heat exchanger…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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q#1 Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer. Flat plate. Circular/pin fins. Triangular fins.
For the given temperature profile diagram for a heat exchanger, which of the following equation is coIrect, ping x Boding fhed Inlet Outiet a. mhyg = m.Cpc(Tco – Tei) b. m.Cpn(Tn - Tho) = m.Cpc(Ta – Teco) m,C,(Th: - Tho) = m.Cpc(Tco – Te) m,Cpn (Thi - Tho) = m.hr,
PLZ I want full answer with all solution steps A heat exchanger is to be designed to heat 32/68 mixture of ethylene glycol and water from 24 °C to 55 °C by a hot water stream from 79 °C to 42 °C. Flow rate of cold stream is 20 kg/s. Inlet pressure for both stream is 50 psi and the maximum pressure drop of 10 psi for cold stream and 8 psi for hot water are permissible. Report valid assumptions made for the design and give required justification. Estimate i) Heat Transfer, Corrected LMTD, ii) Tube bundle diameter (Using TEMA standards and Codes) and Tube cross sectional area iii) Heat transfer coefficient iv) Overall heat transfer coefficient v) Pressure Drop (Shell side & Tube Side) note: Assume any values for the missing data
2.
A counterflow, concentric tube heat exchanger is designed to heat water from 34 to 80 deg C using hot oil,which is supplied to the annulus at 174 deg C and discharged at 140 deg C. The thin-walled inner tube has a diameter of Di=34 mm and the overall heat transfer coefficient is 500 W/m2. K. The design condition calls for a total heat transfer rate of 4400 W. What is the length of the heat exchanger? Select one: a. 0.82485 b. 1.0478 c. 0.95849 d. 0.7013
ps: the mass flow rate of the engine oil is 0.32 kg/s and the velocity of water is 0.04 m/s, and analyze the performance of the heat exchanger compared to the desirable condition
Figure shows a heat exchanger designed to cool 5250 kg/h of an ethyl alcohol solution (Cp = 3810 J/kg. °C) from 66 °C to 39 °C.Water (Cp = 4200 J/kg. °C) at 10 °C is pumped at 4750 kg/h to cool the solution. The tube side fluid flows in a circular pipe with an outside diameter of 25 mm. The overall heat transfer coefficient is (6.84x10^2) W/(m².°C). Find the tube length 'L' for one pass of a two-pass parallel flow double-pipe heat exchanger as shown in Figure. Answer should be in m with three significant figures.
Water from a natural river source at 22°C and a flow rate of 25,000 kg/s is used as the heat sink for a condenser unit at a large manufacturing company. The condenser consist of 20,000 tubes and is used to condense steam to liquid at 50°C. construction and 20mm nominal diameter. The condenser is a one The tubes are of thin wall shell, two-tube-passes heat exchanger. convective heat transfer coefficient of 11,500 W/m².K on the tube outer surface and the water flowing in the tubes is required to remove heat at a rate of 2 x 10° W. Environmental laws require that the effluent from the condensing unit to the river source should be less than 35°C. Using both the e-NTU and LMTD methods, calculate the outlet temperature of the cooling water and the required tube length per pass. The specification is a Use T =27°C; and for flow through the tubes use, Nu, = 0.023 Re Pr°4
A dairy farm needs to chill the milk from 39°C (extraction temperature is the same as the cow's body temperature) to at least 12°C for storage by using an existing 4-m long concentric-tube heat exchanger. The inner tube of the heat exchanger is 4 cm in diameter. The milk (density: 1035 kg/m³, specific heat: 3860 J/kg.K) flows into the heat exchanger at a rate of 270 liters per hour. On the cold side, there is a supply of water at 2°C at a rate of 0.23 kg/s. The estimated overall heat transfer coefficient of the heat exchanger is 1084.2 W/m².K. It was measured that the water comes out of the heat exchanger at 11°C. Is the milk indeed being cooled down to at least 12°C by heat exchanger as required by the farm? Looking at the temperatures obtained from your calculation, put an argument whether the heat exchanger is a parallel-flow or a counter-flow heat exchanger. Approximate specific heat of water is 4200 J/kg.K. Neglect radiation.
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QUESTION 7 A local brand of water heater has offered a counterflow concentric tube heat exchanger, consisting of thin walled copper drains with a diameter D; = 50 mm. Waste water from the shower enters the heat exchanger at Thi= 38 °C while fresh water enters the room at Te,j= 10 °C. The waste water flows down the vertical drain wall in a thin, falling film and providing h, = 10 kW/m²·K. i. If the annular gap is d = 10 mm, the heat exchanger length is L = 1 m, and the water flow rate is m = 10 kg/min, determine the heat transfer rate and outlet temperature of the warmed fresh water. ii. If a helical spring is installed in an annular gap so the fresh water is forced to flow a spiral path from the inlet to the fresh water outlet, resulting in he = 9050 W/m²-K, determine the heat transfer rate and outlet temperature of the fresh water. iii. Based on the result from Q5(b), calculate the daily saving if 15,000 guests each take 10 minutes shower per day and cost of water heating is…

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