superheated steam at atmospheric pressure is suspended from the ceiling of a large room. The steam temperature entering the pipe is 120 oC‚ and the air temperature is 20 oC. The overall heat transfer coefficient on the outer surface of the covered pipe is 10 W/m2.K. if the velocity of the steam is 10 m/s‚ at what point along the pipe will the steam begin condensing and what distance will be required for the steam to reach a mean temperature of 100 oC? Question 2: Consider a horizontal‚ thin
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Fi l +m = Fil + Fim Ji Gij qij i‚ Ji‚ Ai qij=(JiJj)/(1/AiFij) blackbody Ji=Ei(T) function of temperature Radiation network to find flux or potential 40 to 50 % ison radiation Heat exchanger U fouling factor will increase the resistance of heat transfer. how to include into the overall equation (mcp)h Th‚ in Tc‚ out (mcp)c Tc‚in You want to know the cooling effect energy conservation Q= {mcp(Th‚iTh‚o)}h ={mcp(Tc‚oTc‚i) }c Delta Tlm log mean difference
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resistance R0 = 100 Ω at 0o C. If the resistance RT = 197.7 Ω in an oil bath‚ what is the temperature of the oil in the bath‚ given that RT = R0(1+αT)? Take R0 = 100 Ω R0 = resistance at 0o C α = 3.9083 x 10-3 /o C (2 marks) NDE Thermodynamics and Heat Transfer Exam 2008 Name: _______________________________________ Read all the instructions before starting Do not open this paper until instructed Time allowed: 2 hours (plus 5 minutes reading time) Attempt ALL question in Section A (questions 1 – 12)
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concept of Heat Transfer‚ by measuring the temperature distribution for steady state conduction of energy through a specific efficient unit. • Understand the Fourier Law of heat conduction and the usage of its equation in determining the rate of heat flow via solid materials. II. Theory : The Fourier Rate Equation: When a plane section of ∆x and a constant area A maintains a temperature difference ∆T‚ then the heat transfer rate per unit time by conduction through the
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FREESTUDY HEAT TRANSFER TUTORIAL 2 CONVECTION AND RADIATION This is the second tutorial in the series on basic heat transfer theory plus some elements of advanced theory. The tutorials are designed to bring the student to a level where he or she can solve problems ranging from basic level to dealing with practical heat exchangers. On completion of this tutorial the student should be able to do the following. • • Explain the use of the surface heat transfer coefficient. • Explain
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hf. 1. Hear Mass Transfer. Vol. 7‚ pp. 1187-I 194. Pergamon Press 1964. Printed in Great Britain HEAT TRANSFER IN AN ANNULUS WITH VARIABLE CIRCUMFERENTIAL HEAT FLUX? W. A. SUTHERLAND: and W. M. KAYS§ (Received 10 March 1964) Abstract-An analysis of heat transfer in a concentric circular tube annulus with an arbitrarily prescribed heat flux around the periphery of either wall‚ or both walls‚ is presented. Solutions have been obtained for the hydrodynamically and thermally fully
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(MEC 2700) LABORATORY MANUAL JULY 2007 Table of Contents Experiment 1: Heat Capacity of Gases Experiment 2: Thermal and Electrical Conductivity of Metals Experiment 3: Heat Pump Experiment 4: Heat Conduction Experiment 5: Free and Forced Convection Experiment 6: Thermal Radiation Experiment 1: Heat Capacity of Gases 1. BACKGROUND The first law of thermodynamics can be illustrated
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Journal of Food Engineering 73 (2006) 320–326 www.elsevier.com/locate/jfoodeng Determination and correlation of heat transfer coefficients in a falling film evaporator ´ J.S. Prost a‚ M.T. Gonzalez a b a‚b ‚ M.J. Urbicain a‚b‚* ´ ´ ´ Planta Piloto de Ingenierıa Quımica (PLAPIQUI)‚ Camino La Carrindanga Km 7‚ (8000) Bahıa Blanca‚ Argentina ´ ´ ´ Departamento de Ingenierıa Quımica‚ Universidad Nacional del Sur (UNS)‚ Alem 1253‚ (8000) Bahıa Blanca‚ Argentina Received 23 July 2004; accepted
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UNSTEADY STATE HEAT TRANSFER Heat transfer processes are prominent in engineering due to several applications in industry and environment. Heat transfer is central to the performance of propulsion systems‚ design of conventional space and water heating systems‚ cooling of electronic equipment‚ and many manufacturing processes (Campos 3). Unsteady state conduction is the class of heat transfer in which the temperature of the conducting medium varies with time and position. This occurs frequently in
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HEAT TRANSFER LECTURE 1 OUTLINE Introduction Heat Conduction Forced Convection Natural Convection Application of Conduction & Convection Thermal Radiation Application of Radiation Introduction What does the subject of heat transfer deal with? And why it is important. What does the subject of mass transfer deal with? Heat transfer is the science that deals with the study of rates of exchange of heat between hot and cold bodies.
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