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Question #4 [25 marks) 140 minutes + 6 minutes for uploading A double pipe counter-flow heat exchanger is used to cool a hot fluid (p=1030 kg/m and cp-3860 J/kg - °C) flowing at a rate of 200 liter/hour from 38°C to 15°C by using ground water (p=1000 kg/m and cp = 4180 J/kg. "C) that enters at 11°C and a flow rate of 0.75 m/h. Using e-NTU method: a) Determine the outlet temperature of the water. [6 marks] b) Determine the UA product of the heat exchanger required for the cooling process. [12 marks] Calculate the length of the exchanger if the inner pipe has a 50 mm diameter and the overall heat transfer coefficient is U = 826.5 W/m2.°С.12 marks d) Obtain the hot fluid outlet temperature if the water flow rate is increased by 20% [3 marks) e) In order to enhance heat transfer, the length of the heat exchanger is now doubled. Do you think its effectiveness will also double? Explain. [2 marks! Maximum file size: 250MB, maximum number of files: 3 Files You can drag and drop files here to add them.