Problelm 3.6 Given data: Thi := 250 °C Tci := 30 °C mh := 0.15 kg s mc := 0.6 kg s cph := 2000 J kg⋅ K cpc := 1000 J kg⋅ K U := 1000 W m K 2 Finding Heat Exchanger Area(A0): 2 Cc := mc⋅ cpc = 600 m ⋅ kg K⋅ s 3 Ch := mh⋅ cph = 300 m ⋅ kg K⋅ s 3 2 Tco := mh⋅ cph⋅ Thi + mc⋅ cpc⋅ Tci mh⋅ cph + mc⋅ cpc 4 = 103.333 °C Tho := Tco Q := Ch⋅ ( Thi − Tho) = 4.4 × 10 W Thi − Tco − ( Tho − Tci) Thi − Tco ln Tho − Tci Cc Ch Ch Cc ε0 := if ( Cc
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FUNDAMENTAL CONCEPTS Heat transfer is energy in transit‚ which occurs as a result of temperature gradient or difference. This temperature difference is thought of as a driving force that causes heat to flow. The concepts of heat transfer and temperature‚ the key words in the discipline of heat transfer‚ are 2 of the most basic concepts of thermodynamics. dffffffffff rifffff orfff ffffffffff fv ing ff ce Rate of transport process= fffffffffff or rate = coefficient B driving force resist
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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
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Name: ______________________________________ Date: ________________________ Student Exploration: Heat Transfer by Conduction Vocabulary: conduction‚ convection‚ insulate‚ radiation‚ thermal conductor‚ thermal energy‚ thermal insulator Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Suppose two frying pans have been left on the stove with the burners on. One of the frying pans has a metal handle and the other has a wooden handle. 1. Which handle do you think you could
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Heat resistance of endospores of Bacillus pumilus Abstract Spore suspension of Bacillus pumilus was inoculated into universal bottles containing sterile distilled water in water baths at temperatures of 85°C‚ 90°C and 95°C. At specific time intervals‚ a sample was removed and spread on nutrient agar plates. The number of colonies formed was used to determine the D-value and z-value. The D-value for 85°C is 64.1 minutes‚ 25.7 minutes for 90°C and 8.2 minutes for 95°C while the z-value is 11
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of the metal was determined by the heat energy calculations. The heat capacity that was found matched closely to that of the lead. There were several possible sources of error that could be found throughout the lab. Some of the main errors as seen in question 7 that could have affected the results of the lab were the amount of water transferred with the hot metal‚ the metal cooling off as it was transferred from the calorimeter‚ the calorimeter lost heat to the surroundings as it was stirred
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Project – I DESIGN OF GEOTHERMAL HEAT PUMP A Project Report Submitted By Peter Galimutti (2474762) Neeraj Pastakia (2462895) Balasubrahmanyam Vanum (2474858) (MCE 622: Energy Conversion) MASTER OF SCIENCE IN MECHANICAL ENGINEERING Fall 07 Under the esteemed guidance of Dr.Earnest N.Poulous (Associate Professor) DEPARTMENT
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Understand 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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The Little Heat Engine: Heat Transfer in Solids‚ Liquids and Gases The question now is wherein the mistake consists and how it can be removed. Max Planck‚ Philosophy of Physics‚ 1936. While it is true that the field of thermodynamics can be complex‚1-8 the basic ideas behind the study of heat (or energy) transfer remain simple. Let us begin this study with an ideal solid‚ S1‚ in an empty universe. S1 contains atoms arranged in a
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