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The space between the panes of a double-glazed window can be filled with either air or carbon dioxide at atmospheric pressure. The window is 1.5 m high and the spacing between the panes can be varied. Develop an analysis to predict the convection heat transfer rate across the window as a function of pane spacing and determine, under otherwise identical conditions, whether air or carbon dioxide will yield the smaller rate. Illustrate the results of your analysis for two surface-temperature conditions: winter (-10°C, 20°C) and summer (35°C, 25°C).
A system consisting of 1kg of H2O undergoes a cycle composed of the following closed processes:
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Your classroom is held at an air temperature of 20 degrees Celsius. When the outside temperature is 30 degrees Celsius in the summer, you only need to wear a t-shirt. While, when the outside temperature is -10 degrees Celsius in the winter, you need ..
a hollow spherical iron container whose outer diameter is 20 cm and the thickness is 0.4 cm is filled with ice water at
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Determine the heat fluxes associated with convection, q"conv, evaporation, q"evap, and radiation exchange with the sky, q"rad. Do your calculations suggest why the concrete is wet instead of dry? Explain briefly.
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