Question 5.7 In a parallel flow heat exchanger, hot fluid enters the heat exchanger at a temperature of 150°C and a mass flow rate of 3 kg/s. The cooling medium enters the heat exchanger at a temperature of 30°C with a mass flow rate of 0.5 kg/s and Examiner's Signature Moderator's Signature Page leaves at a temperature of 70°C. The specific heat capacities of the hot and cold fluids are 1150 J/kg-K and 4180 J/kg K, respectively. The convection heat transfer coefficient on the inner and outer side of the tube is 300 W /m2.K and 800 W /m2.K, respectively. For a fouling factor of 0.0003 m2.K/W on the tube side and 0.0001 m2.K/W on the shell side, determine the overall heat transfer coefficient, the exit temperature of the hot fluid as well as the surface area of the heat exchanger.

Question 5.7 In a parallel flow heat exchanger, hot fluid enters the heat exchanger at a temperature of 150°C and a mass flow rate of 3 kg/s. The cooling medium enters the heat exchanger at a temperature of 30°C with a mass flow rate of 0.5 kg/s and Examiner's Signature Moderator's Signature Page leaves at a temperature of 70°C. The specific heat capacities of the hot and cold fluids are 1150 J/kg-K and 4180 J/kg K, respectively. The convection heat transfer coefficient on the inner and outer side of the tube is 300 W /m2.K and 800 W /m2.K, respectively. For a fouling factor of 0.0003 m2.K/W on the tube side and 0.0001 m2.K/W on the shell side, determine the overall heat transfer coefficient, the exit temperature of the hot fluid as well as the surface area of the 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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Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

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! Required information Consider operation of a single-pass cross-flow heat exchanger with water (cp=4193 J/kg-K) (mixed) and methanol (cp=2577 J/kg-K) (unmixed). Water entering and exiting the heat exchanger at 93°C and 60°C, respectively, is used to heat the methanol initially at 10°C. The overall heat transfer coefficient and the total heat transfer rate is estimated to be 650 W/m².K and 250 kW, respectively. An effectiveness of at least 0.5 is to be achieved. Calculate the mass flow rate of water. (Round the answer to two decimal places.) The mass flow rate of water is kg/s.
2. In a counterflow double-pipe heat exchanger, the hot fluid enters at 149°C and exits at 76°C. The cold fluid enters at 33°C and exits at 87°C. What is the heat exchanger effectiveness? Express your answer as a decimal value.
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Task 2 Your second customer wants to choose a parallel-flow-plate-type heat exchanger that contains two fluids (oil and water) separated by a thin metal sheet as shown in figure 1 for cooling the lubricating oil. The heat exchanger is insulated by a 130-mm glass fiber insulation (paper faced, 28 kg/m³). The heat transfer coefficients of water and oil are 1200 and 900 W/m² °C, respectively. 2 m Ts cm S cm 5 cm OIL Water Figure 1: A parallel-flow-plate-type heat exchanger. STEP 1 The flow rate of cooling water is 0.2 kg/s, and the flow rate of oil the is 0.1 kg/s. Also, the oil and water enter at temperatures of 100 and 30°C, respectively, and the outlet temperature of the oil is 40°C. if the top surface of the heat exchanger is exposed to an atmospheric air (T=10°C) that is parallel to the flows and maintains a heat transfer coefficient of h = 70 W/m2 K, which includes the effects of radiation, help your customer to calculate the heat losses from it.
QUESTION 9 As in the previous question, a concentric-tube, counter-flow heat exchanger, as shown below, is used to cool mercury [C, h = 1,370 J/kg - "C] flowing at a rate of 1.0 kg/s from 110°C to 70°C. 10 The cooling fluid is water entering the heat exchanger at a temperature of 30°C and flow rate of 0.2 kg/s. The overall heat transfer coefficient of the exchanger is U = 250 w/m² - °C. Water Mercury Calculate the required heat transfer area. O 7.75 m2 O 11.75 m2 O 4.75 m2 O None of these answers O 8.75 m2 Click Save and Submit to save and submit. Click Sare All Answers to save all answers. Save All Answers 人 100% G
part d
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Task (1) A. You were asked to design and manufacture a plate heat exchanger, as shown in the figure, to be used in transferring heat from hot water to cold water. Which material (copper, aluminium or polyethylene) will you choose to manufacture the inner plates of the heat exchanger to obtain the highest heat transfer? Give reason for your choice. B. Will the device be lighter in weight if it is made of copper, aluminium or polyethylene? Explain your answer. C. After you completed manufacturing the heat exchanger, you noticed that its outer surface is conductive to electricity, which may be dangerous during operation. what can you do to insulate it? D. Explain two types of degradation that could happen in the heat exchanger and discuss how to prevent them? E. Briefly explain one of the degradation types in polymers.