Ethylene glycol is heated from 25°C to 40°C at a rate of 2.5 kg/s in a horizontal copper tube (k = 386 W/m·K) with an inner diameter of 2.0 cm and an outer diameter of 2.5 cm. A saturated vapor (Tg = 110°C) condenses on the outside-tube surface with the heat transfer coefficient (in kW/m2·K) given by 9.2/(Tg - Tw)0.25, where Tw is the average outside-tube wall temperature. What tube length must be used? Take the properties of ethylene glycol to be r = 1109 kg/m3, cp = 2428 J/kg·K, k = 0.253 W/m·K, m = 0.01545 kg/m·s, and Pr = 148.5.
Ethylene glycol is heated from 25°C to 40°C at a rate of 2.5 kg/s in a horizontal copper tube (k = 386 W/m·K) with an inner diameter of 2.0 cm and an outer diameter of 2.5 cm. A saturated vapor (Tg = 110°C) condenses on the outside-tube surface with the heat transfer coefficient (in kW/m2·K) given by 9.2/(Tg - Tw)0.25, where Tw is the average outside-tube wall temperature. What tube length must be used? Take the properties of ethylene glycol to be r = 1109 kg/m3, cp = 2428 J/kg·K, k = 0.253 W/m·K, m = 0.01545 kg/m·s, and Pr = 148.5.
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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Question
Ethylene glycol is heated from 25°C to 40°C at a
rate of 2.5 kg/s in a horizontal copper tube (k = 386 W/m·K)
with an inner diameter of 2.0 cm and an outer diameter
of 2.5 cm. A saturated vapor (Tg = 110°C) condenses on
the outside-tube surface with the heat transfer coefficient
(in kW/m2·K) given by 9.2/(Tg - Tw)0.25, where Tw is the
average outside-tube wall temperature. What tube length
must be used? Take the properties of ethylene glycol to
be r = 1109 kg/m3, cp = 2428 J/kg·K, k = 0.253 W/m·K,
m = 0.01545 kg/m·s, and Pr = 148.5.
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