Define Conduction Radiation and convection. and reference to a marine boiler
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Define Conduction Radiation and convection. and reference to a marine boiler
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- Volumetric thermal expansion is used in modeling natural convection heat transfer. Derive an expression for volumetric thermal expansion coefficient for an ideal gas.With reference to a Marine (Ship's) Boiler, describe the methods of heat transfer, Conduction, Convection and RadiationDiscuss and Illustrate the 3 modes of heat transfer.
- All thermos containers have a thin region of vacuum between the outer casing and theinner reservoir. It takes a long time for very hot or very cold liquids inside the thermos toreach room temperature because(A) vacuums have a low thermal conductivity(B) vacuums have a low heat capacity(C) radiation cannot travel across a vacuum(D) the second law of thermodynamics forbids rapid temperature changesIllustrating the relationships between system constants for the chosenperfect gas system(refrigeration systems). Discuss the relevance of the ideal gas law constants and explain how changes in one variable affectthe others under the condition of a perfect gas. Include molar mass, gas constant, and specific heatcapacities of gases, including the associated equations.A vertical plate is held at a constant temperature of 10oC. The surrounding air is at Tinf=100oC. For the natural convection process that is induced, where do you expect the highest heat transfer to occur? Explain.
- Hi, can you help me to answer this question using the first law of thermodynamics? On a hot summer day a student turns his fan on when he leaves his room in themorning. When he returns in the evening will the room be warmer or cooler than theneighborouing rooms ? Explain your answer using the first law of thermodynamics.Assume ALL doors and windows are kept closed.•An astronaut is at work in the service bay of a spacecraft and is surrounded by walls at -100oC. The outer surface area of the suit is 3m2. The suit has an emissivity of 0.05. Calculate the rate of heat loss when the suit’s outer temperature is 0oC How much food the astronaut has to eat to maintain the level of heat loss?The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196 °C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196 °C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 3-m-diameter spherical tank that is initially filled with liquid nitrogen at 1 atm and -196 °C. The tank is exposed to ambient air at 15° C, with a combined convection and radiation heat transfer coefficient of 35 W/m2⋅K. The temperature of the thin-shelled spherical tank is observed to be almost the same as the temperature of the nitrogen inside. Determine the rate of evaporation (in kg/s) of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air if the tank is insulated with…