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-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m².K and the tabulated average properties. Teout Toin = 100°C Oil Water m,= 0.1 kg/s n = 0.1 kg/s Tw,in = 30°C Tw.out Properties Water Oil P (kg/m3) 1000 800 Cp (J/kg • K) 4200 1900 v (m²/s) 7x 10-7 1x 10-5 k (W/m - K) 0.64 0.134 Pr 4.7 140 (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.
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-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m².K and the tabulated average properties. Teout Toin = 100°C Oil Water m,= 0.1 kg/s n = 0.1 kg/s Tw,in = 30°C Tw.out Properties Water Oil P (kg/m3) 1000 800 Cp (J/kg • K) 4200 1900 v (m²/s) 7x 10-7 1x 10-5 k (W/m - K) 0.64 0.134 Pr 4.7 140 (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.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Transcribed Image Text: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-mm
diameter 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,out
Toin = 100°C
Oil
Water
m, = 0.1 kg/s
m, = 0.1 kg/s
Tw.in = 30°C
Tw.out
Properties
Water
Oil
p (kg/m3)
Cp (J/kg - K)
v (m2/s)
k (W/m · K)
1000
800
4200
1900
7x 10-7
1 × 10-5
0.64
0.134
Pr
4.7
140
(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.
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