Tutorial 1 (Conduction and Convection) 1. Consider a composite structure shown on below. Conductivities of the layer are: k1 = k3 = 10 W/mK‚ k2 = 16 W/mK‚ and k4 = 46 W/mK. The convection coefficient on the right side of the composite is 30 W/m2K. Calculate the total resistance and the heat flow through the composite. (0.46‚ 173.9 W) 2. Consider a 1.2-m high and 2-m-wide glass window whose thickness is 6 mm and thermal
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Heat energy is transferred from homes by conduction through the walls‚ floor‚ roof and windows. It is also transferred from homes by convection. For example‚ cold air can enter the house through gaps in doors and windows‚ and convection currents can transfer heat energy in the loft to the roof tiles. Heat energy also leaves the house by radiation through the walls‚ roof and windows. http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/energy_home/1_keeping_homes_warm2.shtml Visited
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This is forced convection heat transfer modes as it involve fluid (in this case the air) in forced motion. Hot stream of air is then directed to work surface by using nozzle which comes in various size and shape. The second forced convection heat transfer modes the takes place as hot stream of air make contact with work surface which usually involve material sub-melting. Even though every matter producing radiation mode of heat transfer‚ in this case we only focus on forced convection heat transfer
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Heat energy is energy on the move. Moving from places of high temperature to areas of low temperature. The bigger the temperature difference‚ the faster the heat transfer. Heat moves by three different processes: Conduction - mainly in solids Convection - mainly in liquids and gases Radiation - any state of matter can absorb/emit infrared radiation. Conduction Vibrations in matter are passed on to transfer heat energy. This is called conduction. Insulator - a material that stops energy being
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Litosphere: the rigid outer part of the earth‚ consisting of the crust and upper mantle. d. Asthenosphere: the upper layer of the earth’s mantle‚ below the lithosphere‚ in which there is relatively low resistance to plastic flow and convection is thought to occur. e. Mantle: between the crust and core f. Outer Core: Earth’s outer
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and porcelain. Otherwise‚ Air is a poor conductor of heat. CONVECTION Convection occurs when heat is spread by the movement of air‚ steam‚ or liquid (including hot fat). There are two kinds of convection: 1. Natural. Hot liquids and gases rise while cooler ones sink. Thus‚ in any oven‚ kettle of liquid or deep-fat fryer a constant‚ natural circulation distributes heat. 2. Mechanical. In convection ovens and convection steamers‚ fans speed the circulation of heat. Thus‚ heat is transferred
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heating up‚ lifting pressure‚ and timely start / stop and stable combustion performance. D type boiler design: SZS series of boiler are design by double drum‚ longitudinal type‚ full water pipe structure. It is consist of the upper and lower drum‚ convection bank and the left and right set of boxes. The total size are close-knit‚ and the external appearance is elegant and beautiful. It apply to com-bust under slightly negative pressure because the water screen of the boiler furnace is use of close-packed
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Why will the Alaskan Way Viaduct collapse? The Alaskan Way Viaduct will collapse because of an earthquake.The earthquake’s cause has to do with the layers of the Earth‚ mainly the lithosphere and the asthenosphere. The result of the lab “Density Column” proved that since the layers of the Earth are stacked on top of each other‚ like the liquids in the “Density Column”‚ the layers must have different densities. Another lab that was done in class‚ “Density Cubes”‚ showed that density‚ or
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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 particularly well with an
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Granulations doesn’t last very long‚ and it disappear really fast. Individual granulations‚ it only visible for about only minutes. Granulations on the photosphere of the Sun are caused by convection currents (thermal columns‚ Bénard cells) of plasma with in the Sun’s convective zone. Granulations are caused by convection currents because the rising part of the granules is in the center where the plasma is hotter. The outer edge of the granules is darker due to the cooler descending plasma. In addition
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