Substance Steam water Ice → water Latent Heat (J/kg) 2,260,000 333,000 Answer the following questions dealing with methods of heat transfer. Radiation An orange orb has an emissivity of 0.535 and its surroundings are at 204°C. The orange orb is absorbing heat via radiation at a rate of 851 W and it is emitting heat via radiation at a rate of 470 W. Determine the surface area of the orb, the temperature of the orb, & Pnet A = Torb = Р. net = ☐ Convection The exterior walls of a house have a total area of 180 m² and are at 12.9°C and the surrounding air is at 7.7° C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.4 W/(m².°C). Since you're looking for the rate of cooling, your answer should be entered as positive. □ Conduction Ice of mass 11.2 kg at 0°C is placed in an ice chest. The ice chest has 3 cm thick walls of thermal conductivity 0.06 W/m.K and a surface area of 1.31 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 33° C, how long will it take for the ice to melt?
Substance Steam water Ice → water Latent Heat (J/kg) 2,260,000 333,000 Answer the following questions dealing with methods of heat transfer. Radiation An orange orb has an emissivity of 0.535 and its surroundings are at 204°C. The orange orb is absorbing heat via radiation at a rate of 851 W and it is emitting heat via radiation at a rate of 470 W. Determine the surface area of the orb, the temperature of the orb, & Pnet A = Torb = Р. net = ☐ Convection The exterior walls of a house have a total area of 180 m² and are at 12.9°C and the surrounding air is at 7.7° C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.4 W/(m².°C). Since you're looking for the rate of cooling, your answer should be entered as positive. □ Conduction Ice of mass 11.2 kg at 0°C is placed in an ice chest. The ice chest has 3 cm thick walls of thermal conductivity 0.06 W/m.K and a surface area of 1.31 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 33° C, how long will it take for the ice to melt?
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Question
Transcribed Image Text:Substance
Steam water
Ice → water
Latent Heat
(J/kg)
2,260,000
333,000
Answer the following questions dealing with methods of heat transfer.
Radiation
An orange orb has an emissivity of 0.535 and its surroundings are at 204°C. The orange orb is absorbing heat via radiation at a rate
of 851 W and it is emitting heat via radiation at a rate of 470 W. Determine the surface area of the orb, the temperature of the orb, &
Pnet
A =
Torb =
Р.
net
=
☐ Convection
The exterior walls of a house have a total area of 180 m² and are at 12.9°C and the surrounding air is at 7.7° C. Find the rate of
convective cooling of the walls, assuming a convection coefficient of 3.4 W/(m².°C). Since you're looking for the rate of cooling,
your answer should be entered as positive.
□ Conduction
Ice of mass 11.2 kg at 0°C is placed in an ice chest. The ice chest has 3 cm thick walls of thermal conductivity 0.06 W/m.K and a
surface area of 1.31 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 33° C, how long will it take for the ice to melt?
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