A hot steel plate with a surface area of 2.47 m2 and a constant surface temperature of 161°C is exposed to ambient air at 23°C. If the convection heat transfer coefficient is 18.2 W/m2. K, what is the rate of heat transfer (in W) from the plate to the air [round your final answer to zero decimal places]?
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- A 5-cm-external-diameter, 10-m-long hot-water pipe at 80°C is losing heat to the surrounding air at 5°C by natural convection with a heat transfer coefficient of 25W/m2K. Determine the rate of heat loss from the pipe by natural convection.An object is heated to 90°C and is kept in a room where the ambient temperature is around 25°C. If the object has an emissivity of 0.4 and an area of 2.0 m² what will be the rate of heat transfer by radiation alone?The average thermal conductivity of the walls (including windows) and roof of a house in the figure shown below is 4.8 x 104 kW/m · °C, and their average thickness is 21.4 cm. The house is heated with natural gas, with a heat of combustion (energy given off per cubic meter of gas burned) of 9,300 kcal/m3. How many cubic meters of gas must be burned each day to maintain an inside temperature of 23.5°C if the outside temperature is 0.0°C? Disregard surface air layers, radiation, and energy loss by heat through the ground. 37.00 5.00 m 8,00 m 10.0 m
- A 500 g copper cup has an initial temperature of 250 oK. If the specific heat of copper is 385 J kg-1 oK-1 and 2.5 x 104 J of heat are transferred into it, what is the final temperature of the cup in Kelvins?The average thermal conductivity of the walls (including windows) and roof of a house in the figure shown below is 4.8 x 104 kW/m - °C, and their average thickness is 20.8 cm. The house is heated with natural gas, with a heat of combustion (energy given off per cubic meter of gas burned) of 9,300 kcal/m3. How many cubic meters of gas must be burned each day to maintain an inside temperature of 27.3°C if the outside temperature is 0.0°C? Disregard surface air layers, radiation, and energy loss by heat through the ground. m3 37.0 5.00 m 8.00 m 10.0 mThe exterior walls of a house have a total area of 194 m2 and are at 12.4°C and the surrounding air is at 7.4° C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 2.9 W/(m2·°C). Since you're looking for the rate of cooling, your answer should be entered as positive.
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- A hot steel plate with a surface area of 2.47 m2 and a constant surface temperature of 161°C is exposed to ambient air at 23°C. If the convection heat transfer coefficient is 18.2 W/m2· K, what is the rate of heat transfer (in W) from the plate to the air [round your final answer to zero decimal places]?The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 75 kg (165 lb) person of height 1.75 m (5.7 ft) would have a body surface area of approximately 1.90 m2. What is the net amount of heat this person could radiate per second into a room at 19.0 °C (about 66.2 °F) if his skin's surface temperature is 30.0 °C? (At such temperatures, nearly all the heat is infrared radiation, for which the body's emissivity is 1.0, regardless of the amount of pigment.)Ice of mass 12.8 kg at 0°C is placed in an ice chest. The ice chest has 2.7 cm thick walls of thermal conductivity 0.07 W/m·K and a surface area of 1.29 m2. Express your answers with appropriate mks units. (a) How much heat must be absorbed by the ice during the melting process? (b) If the outer surface of the ice chest is at 39° C, how long will it take for the ice to melt?