plane surfaces 1 and 2 - I, of 550 K and T, of 43 me that the distance betw eir dimensions.
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- A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The satellite generates 1000 W of internal power from a small nuclear generator. If the surface of the satellite has an emittance of 0.3, and is shaded from solar radiation by the earth, estimate its surface temperature.1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.1.47 A flat roof is modeled as a flat plate insulated on the bottom and placed in the sunlight. If the radiant heat that the roof receives from the sun is , the convection heat transfer coefficient between the roof and the air is 12 W/m2 K, and the air temperature is , determine the roof temperature for the following two cases: (a) Radiative heat loss to space is negligible, (b) The roof is black and radiates to space, which is assumed to be a black- body at 0 K.
- A thin square steel plate, 10cm on a side is heated in a blacksmith's forge to a temperature of 800degC. If emissivity is 0.60, what is the total rate of radiation of energyA pipe passes through a room in which the surrounding air is at 22 ºC. The diameter of the pipe is 200 mm, the length of the pipe is 3metersand its surface temperature is 250ºC and the emissivity of the surface is 0.9 What is the surface emissive power (radiation heat loss)? If convection heat transfer coefficient from the surface to the air is 20 W/m2.K, what is the rate of heat loss from the surface of pipe by convection? Total heat loss from the surface of the pipe per unit lengthA white flying saucer made of aluminum is in outer space, and the sun is shining on the top surface of it. It has a surface area of 1 m² per side. The absorptivity (a) for white paint is 0.3 to 0.5 for solar radiation (H&H Tbl. 4.1), so a good assumption would be to use the average of 0.4. The emissivity (ɛ) for white paint in the 0-38°C range is 0.9. Incoming solar radiation intensity in outer space is 1353 W/m² (p. 12 in H&H). You may assume that there is no conductive or convective heat loss from the plate, as it is almost a vacuum in outer space. Calculate the equilibrium temperature of the plate, based on the incoming solar radiation and the outgoing radiation from the plate back to outer space.
- A box with dimensions 1*1*1 meters and thickness of 2 mm need to be kept at 22c temperature , ambient temperature is 30c . given: ho outer convection coefficient,hi inner convection coefficient, k material conduction , e emisivity . develop and expression for the amount of power that is needed to keep the tank cool from inside .If we consider a flat sheet of iron at 300 K does not receive any radiation from its surroundings. The metal is 10 cm x 10 cm x 0.1 cm; the heat capacity is 25 J/K mol; the density is 7.86 g/cm3. After 20 minutes, what is the temperature of the metal plate? Ans. -54.15 Celsius Show solution.3.4 Estimate the rate of heat loss due to radiation from a covered pot of water at 95 ° C. How does this compare with the 60 W that is lost due only to convection and conduction losses? What amount of energy input would be needed to maintain the water at its boiling point for 30 minutes? The polished stainless steel pot is cylindrical, 20 cm in diameter and 14 cm high, with a tight-fitting flat cover. The air temperature in the kitchen is about 25 ° C. State any assumptions you make in deriving your estimates
- (a) Calculate the rate of heat transfer by radiation from a car radiator at 110°C into a 50.0ºC environment, if the radiator has an emissivity of 0.750 and a 1.20-m^2 surface area. (b) Is this a significant fraction of the heat transfer by an automobile engine? To answer this, assume a horsepower of 200hp (1.5kW) and the efficiency of automobile engines as 25%.Question Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain.A brass plate has a circular hole whose diameter is slightly smaller than the diameter of an aluminum ball. Ifthe ball and the plate are always kept at the same temperature,(a) should the temperature of the system be increased or decreasedin order for the ball to fit through the hole? (b) Choose the bestexplanation from among the following:I. The aluminum ball changes its diameter more with temperature than the brass plate, and therefore the temperatureshould be decreased.II. Changing the temperature won’t change the fact that the ballis larger than the hole.III. Heating the brass plate makes its hole larger, and that willallow the ball to pass through.