TAILIEUCHUNG - A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 1 Part 5

Tham khảo tài liệu 'a heat transfer textbook - third edition episode 1 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Problems 89 spectively and the heat transfer coefficients are 10 on the left and 18 on the right. T 1 30 C and T-yr 10 C. Compute U for the slab in Example . Consider the tea kettle in Example . Suppose that the kettle holds 1 kg of water about 1 liter and that the flame impinges on m2 of the bottom. a Find out how fast the water temperature is increasing when it reaches its boiling point and calculate the temperature of the bottom of the kettle immediately below the water if the gases from the flame are at 500 C when they touch the bottom of the kettle. Assume that the heat capacitance of the aluminum kettle is negligible. b There is an old parlor trick in which one puts a paper cup of water over an open flame and boils the water without burning the paper see Experiment . Explain this using an electrical analogy. a dT dt C s. Copper plates 2 mm and 3 mm in thickness are processed rather lightly together. Non-oil-bearing steam condenses under pressure at Tsat 200 C on one side h 12 000 W m2K and methanol boils under pressure at 130 Con the other h 9000 W m2K . Estimate U and q initially and after extended service. List the relevant thermal resistances in order of decreasing importance and suggest whether or not any of them can be ignored. kg s of air at 20 C moves along a channel that is 1 m from wall to wall. One wall of the channel is a heat exchange surface Figure Configuration for Problem . 90 Chapter 2 Heat conduction thermal resistance and the overall heat transfer coefficient U 300 W m2K with steam condensing at 120 C on its back. Determine a q at the entrance b the rate of increase of temperature of the fluid with x at the entrance c the temperature and heat flux 2 m downstream. c T2m C. An isothermal sphere 3 cm in diameter is kept at 80 C in a large clay region. The temperature of the clay far from the sphere is kept at 10 C. How much heat must be supplied to the sphere to maintain its .

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