A hot steel plate with a surface area of 2.43 m2 and a constant surface temperature of 168°C is exposed to ambient air at 22°C. If the convection heat transfer coefficient is 18.9 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 hot steel plate with a surface area of 2.43 m2 and a constant surface temperature of 168°C is exposed to ambient air at 22°C. If the convection heat transfer coefficient is 18.9 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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- 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?Heat from the Sun is incident on a leaf that is horizontal to the radiation. The power per unit area from the Sun is 8.75 102 W/m2. Assume that 75.0% of this energy goes into heating the leaf. The specific heat capacity of the leaf is 3.7 kJ/(kg °C, its mass is 0.300 g, and surface area is 8.00 x 10-3 m2. (a) Calculate the power that goes into heating the leaf. W (b) Calculate the rate of the rise in the temperature of the leaf. (Hint: Q = mc?T) °C/sThe 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
- 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 24.0°C if the outside temperature is 0.0°C? Disregard surface air layers, radiation, and energy loss by heat through the ground. 34.68 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. m3 137.00 5.00 m 00 8.00 m 10.0 mA hot steel plate with a surface area of 1.52 m2 and a constant surface temperature of 166°C is exposed to ambient air at 22°C. If the convection heat transfer coefficient is 15.9 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]? T. S Air, T, 00A person is standing outdoors in the shade where the temperature is 20 °C. (a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 160 cm² and its emissivity is 0.81. (b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.68?
- 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.Suppose you walk into a sauna that has an ambient temperature of 65.0°C. (a) Calculate the rate of heat transfer to you by radiation given your skin temperature is 37.0°C, the emissivity of skin is 0.98, and the surface area of your body is 1.50 m². (b) If all other forms of heat transfer are balanced (the net heat transfer is zero), at what rate will your body temperature increase if your mass is 60.0 kg? O A. None of the options provided is correct. O B. a) 1.89 kW, b) 137.7°C/h O C. a) 2 kW, b) 10°C/h ○ D. a) 318.5 W, b) 5.46 °C/h ○ E. a) 5.46 W, b) 318.5 °C/h
- Heat is being transferred from the bottom of a saucepan of soup, to the top. Once convection begins, the temperature of the soup increases by 10 degrees Celsius. If it takes 3 minutes for the soup to increase temperature, and the mass of the soup is 2 kilograms, calculate the heat transferred per second in the process of increasing the soup's temperature. (The average specific heat capacity of the soup is 4000 J / kg C.) 44.4 Joules per second. 4444.4 Joules per second. 26667 Joules per second. 180 Joules per second. 444.4 Joules per second.Please answer this, I need help.An incandescent light bulb with a surface area of 0.0128 m2 and an emissivity of 0.87 has a surface temperature of 175.9°C. If the temperature of the surroundings are 22.6°C, what is the net rate of radiation heat transfer between the bulb and the surroundings? [round your final answer to one decimal place]? {σ = 5.6704 x 10-8 W/(m2∙K4)}