2.7 The day's radiation on a horizontal surface in Madison (Ø = 43°) on December 22 is 8.80 MJ/m². There is a fresh snow cover. For the hour 11 to 12, estimate the diffuse radiation, the ground-reflected radiation, and the total radiation on a south-facing vertical surface.
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- A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 270 K. If the wire is at 800 K, calculate the net rate of heat loss. Discuss your assumptions.1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .8 mm thick sheets of metal (cp = 750 J/kgK and p = 5250 kg/m³) leave an oven at 1500 K and have the following distribution for spectral, hemispherical emissivity: 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2 (um) Conduction, convection, and radiation from the surroundings can be neglected. Assume that the only mode of heat transfer is emission to the surroundings at 0 K. 5.2. What is the magnitude of the initial time rate of change of the temperature of the sheet? Select one: O a. 1.0172 K/s O b. 2.3018 K/s Oc. 5.9460 K/s O d. 2.872 K/s O e. 3.5695 K/s O f. 7.9053 K/s O g. 10.1481 K/s O h. 8.2245 K/s O i. None of these
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- If you are Good at heat transfer then Please Solve This Problem. Otherwise Skip. [rating will be Given after verification ]Radiation 3. Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20 C throughout the year, while the walls of the room are nominally at 27 °C and 14 °C in the summer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a temperature of 32 °C throughout the year and to have an emissivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m²K.I need the answer quickly
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