Oil is cooled by water in a counter-current heat exchanger. If the flow rate of the oil is 1.5 kg s-1 and that of the water is 1.0 kg s-1, estimate the temperature to which the oil is cooled if the water enters at -10•C and leaves at 5•C. The oil enters the heat exchanger at 25-C. If the heat transfer surface area of the exchanger is 5 m2, determine the outlet temperature of the oil (•C) and the overall heat transfer coefficient (W m-2 K-). Take the mean heat capacity of oil and water to be 2.09 kJ kg** K-l and 4.18 kJ kg1 K', respectively. Select one: O A. AToll-out =5•C, U = 721.51 W/(m2 K') O B. ATO--out =5•C, U = 360.74 W/(m2 K') O C. AToll-out =10 C, U = 721.51 W/(m2 K') %3D O D. AToll-out = 10 C, U = 360.74 W/(m2 K')
Oil is cooled by water in a counter-current heat exchanger. If the flow rate of the oil is 1.5 kg s-1 and that of the water is 1.0 kg s-1, estimate the temperature to which the oil is cooled if the water enters at -10•C and leaves at 5•C. The oil enters the heat exchanger at 25-C. If the heat transfer surface area of the exchanger is 5 m2, determine the outlet temperature of the oil (•C) and the overall heat transfer coefficient (W m-2 K-). Take the mean heat capacity of oil and water to be 2.09 kJ kg** K-l and 4.18 kJ kg1 K', respectively. Select one: O A. AToll-out =5•C, U = 721.51 W/(m2 K') O B. ATO--out =5•C, U = 360.74 W/(m2 K') O C. AToll-out =10 C, U = 721.51 W/(m2 K') %3D O D. AToll-out = 10 C, U = 360.74 W/(m2 K')
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.
Question
Transcribed Image Text:Oil is cooled by water in a counter-current heat exchanger. If the flow rate of the oil
is 1.5 kg s-1 and that of the water is 1.0 kg s-1, estimate the temperature to which
the oil is cooled if the water enters at - 10-C and leaves at 5-C. The oil enters the
heat exchanger at 25 C. If the heat transfer surface area of the exchanger is 5 m?,
determine the outlet temperature of the oil (•C) and the overall heat transfer
coefficient (W m-2 K-1). Take the mean heat capacity of oil and water to be 2.09 kJ
kg-1 K-1 and 4.18 kJ kg-1 K-1, respectively.
Select one:
O A. AToil-out =5•C, U = 721.51 W/(m2 K')
O B. AToil-out =5•C, U = 360.74 W/(m2 K')
O C. AT oll-out =10•C, U = 721.51 W/(m2 K')
O D. AToil-out =10-C, U = 360.74 W/(m2 K')
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