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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-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m²K and the tabulated average properties. (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water (b) Determine the length required for the heat exchanger. Compare your answers when using the LMTD method and the NTU method Water mw = 0.1 kg/s T o,out I Tw.in Properties p (kg/m³) Cp (J/kg-K) v (m²/s) k (W/m .K) Pr = 30°C Water 1000 4200 7 x 10-7 0.64 4.7 To.in = 100°C Tw.out Oil in = 0.1 kg/s Oil 800 1900 1 x 10-5 0.134 140

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-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m²K and the tabulated average properties. (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water (b) Determine the length required for the heat exchanger. Compare your answers when using the LMTD method and the NTU method Water mw = 0.1 kg/s T o,out I Tw.in Properties p (kg/m³) Cp (J/kg-K) v (m²/s) k (W/m .K) Pr = 30°C Water 1000 4200 7 x 10-7 0.64 4.7 To.in = 100°C Tw.out Oil in = 0.1 kg/s Oil 800 1900 1 x 10-5 0.134 140

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Example 9 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-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m²K and the tabulated average properties. (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water (b) Determine the length required for the heat exchanger. Compare your answers when using the LMTD method and the NTU method Water mw = 0.1 kg/s W T 1 o,out I Tw Properties p (kg/m³) Cp (J/kg .K) v (m²/s) k (W/m .K) Pr w, in = 30°C Water 1000 4200 7 x 10-7 0.64 4.7 T o, in Tw.out = 100°C Oil m = 0.1 kg/s Oil 800 1900 1 × 10-5 0.134 140
Transcribed Image Text:Example 9 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-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m²K and the tabulated average properties. (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water (b) Determine the length required for the heat exchanger. Compare your answers when using the LMTD method and the NTU method Water mw = 0.1 kg/s W T 1 o,out I Tw Properties p (kg/m³) Cp (J/kg .K) v (m²/s) k (W/m .K) Pr w, in = 30°C Water 1000 4200 7 x 10-7 0.64 4.7 T o, in Tw.out = 100°C Oil m = 0.1 kg/s Oil 800 1900 1 × 10-5 0.134 140
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