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 Q=UA DTcm Q=HA Dt A=Q/(U delta T) 2pirL Delta Tlm’= DeltaTlm*F NTU effectiveness ƐNTUmethod Ɛ=?(Q/Qmax) NTU= UA/mcpmin qmax/Qmax design the amount of heat exchange required for a problem
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Practice Problems Set – 1 MEC301: Heat Transfer Q.1 The slab shown in the figure is embedded on five sides in insulation materials. The sixth side is exposed to an ambient temperature through a heat transfer coefficient. Heat is generated in the slab at the rate of 1.0 kW/m3. The thermal conductivity of the slab is 0.2 W/m-K. (a) Solve for the temperature distribution in the slab‚ noting any assumptions you must make. Be careful to clearly identify the boundary conditions. (b) Evaluate T at the
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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 walled circular tube of diameter D = 0.025 m submerge in a container of n-octadecane (paraffin)‚ which is used to store thermal energy. As hot water flows through the tube‚ heat is
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HEAT TRANSFER MECHANISMS Heat energy is being transferred from one location to another because of a temperature difference. The three mechanisms for heat transfer are: • Conduction. When you grip the hot handle of a pan on a stove‚ you feel conduction in action. Heat flows from the pan and along the length of the handle to its cooler free end. This is because one end of the rod is held at the high temperature‚ and the other end stays at the lower temperature. Although the rod itself doesn’t
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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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Vocabulary: • Conduction- the passage of energy‚ particularly heat or electricity‚ through something • Rate of Change- the ratio of the difference in values of a variable during a time period to the length of that time period • Calorimeter- an apparatus for measuring the amount of heat given out or taken in during a process such as combustion or change of state. The measurements are often made by observing the amount of solid liquefied‚ or liquid vaporized‚ under set conditions. • Conservation
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situation for thick pipes is‚ however‚ more complex. [pic] The figure shown above represents the condition in a thick walled pipe. The area for heat flow is proportional to the radius – as may be seen‚ the area at the outside wall of the pipe is much greater than the middle. As a result the temperature gradient is inversely proportional to the radius. The heat flow ‘per unit length of pipe’ at any radius r‚ is [pic] cf. [pic] Note: Area‚[pic] Note there is no length of pipe (l) in this equation
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have had to learn the differences between screen printing and heat transfers. At first‚ it was hard to figure out which one would be the best for our customers. When I finally got the hang of helping our customers in the front‚ it started to get easier. There are many things that should be considered when deciding on what method you should use. If you need a job done in a hurry‚ your best option would be heat transfer. Heat transfers can typically be done in about two hours‚ depending on size‚
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and observe the 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
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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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