An electric heater with the total surface area of 0.25 m? and emissivity 0.75 is in a room where the air has a temperature of 20°C and the walls are at 10°C. When the heater consumes 500 W of electric power, its surface has a steady temperature of 120°C. Determine the temperature of the heater surface when it consumes 700 W. Solve the problem (a) assuming negligible radiation and (b) taking radiation into consideration. Based on your results, comment on the assumption made in part (a) 4. A, E

Q: Consider a person standing in a room maintained at 20°C at all times. The inner surfaces of the…

A:

Q: Consider a person whose exposed surface area is 1.7 m², emissivity is 0.7, and surface temperature…

A: (a) Write the given data. A=1.7 m2ε=0.7Ts=32 °C=305 KTw=300 K

Q: Two nested spherical tanks with the internal and outer diameters of the 100 cm by 104 cm and 114 cm…

A: Heat transfer through composite sphere   Lets, Q = Heat transfer rate th = Temperature of hot fluid…

Q: A steel plate having a thickness of 100 mm is suddenly exposed to a hot gas at 1000 oC in a furnace.…

A:

Q: The interior surface of a 25 cm thick wall has a temperature of 27 \deg C as shown in the figure.…

A: The objective of this question is to determine the outside surface temperature and the heat flow by…

Q: An aluminum plate, with dimensions of 3 cm × 3 cm × 5 cm (length, width, and thickness,…

A: Given:Volume,V=3*3*5 =45 cm3q=150 J/sρ=2700 Kg/m3t=10 secmass 0f aluminium plate,m=2700*45*10-6…

Q: Q3: Consider a (15cm x 20cm) printed circuit board (PCB) that has electronic components on one side…

A: Given data: Calculate the average temperature of the surrounding.

Q: 3-26 Consider a person standing in a room at 20°C with an exposed surface area of 1.7 m². The deep…

A: Given data: TB=37°CT∞=20°CA=1.7 m2k=0.3 W/m°CQ=150 Wx=0.5 cm Need to determine the skin temperature…

Q: In an orbiting space station, an electronic package is housed in a compartment having a surface area…

A: Surface area, A=1 m2 Surface emissivity, ε=1 Space temperature, To=0 K Heat generated, Q=500 W Solar…

Q: A flat-plate collector gets incident of solar radiation at a rate of 260 Btu/h-ft' and has the…

A: Incident Radiation, G = 260 BTuh*ft2 Collector temperature, Tc = 120 F ambient air temperature, Ta =…

Q: A 1-m diameter spherical solid receives heat from a source at 160°C by radiation and transfers heat…

A: Given: Diameter of the solid sphere is 1 m. Source temperature is 160°C. Surrounding temperature is…

Q: A cat has a body temperature of 48 ºC. She stays inside a closed air conditioned room that has an…

A: Find the heat loss per unit area from the cate

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.