The inner surface of a hollow sphere is 430°C and the heat transfer rate to the outside is 440W. Determine the temperature of the outer surface of a hollow sphere if the inner radius is 3in, outer radius is 4.5in, and the thermal conductivity of 46.15W/m-K.
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- For the human body, what is the rate of heat transfer by conduction through the body's tissue with the following conditions: the tissue thickness is 3.00 cm, the difference in temperature is 2.00 , and the skin area is 1.50 m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.Compute the ratio of the rate of heat loss through asingle-pane window with area 0.15 m2 to that for a double-pane windowwith the same area. The glass of a single pane is 4.2 mm thick,and the air space between the two panes of the double-pane window is7.0 mm thick. The glass has thermal conductivity 0.80 W /m . K. The airfilms on the room and outdoor surfaces of either window have a combinedthermal resistance of 0.15 m2 . K/W.
- There are 4 people in an Igloo (half shpere) with an r of 2.4m and each person emits 120 watts of heat. How thick must the igloo walls be to maintain an inside tmep of 10C if outside temp is -17.8C. (Heat is only lost in this problem through conduction) k of ice blocks is 0.32j/smC. Assume no heat is lost throught the ground Cross section area of sphere 2pi(r)^2The operating temperatureof a tungsten filament in an incandescent light bulb is 2450 K, and itsemissivity is 0.350. Find the surface area of the filament of a 150 Wbulb if all the electrical energy consumed by the bulb is radiated by thefilament as electromagnetic waves. (Only a fraction of the radiation appearsas visible light.)a thin square steel plate, 10cm on a side is heated in a blacksmith`s fotrge to a temperature of 800degC.if emissivity is 0.60. what is the total rate of radiation of energy?
- In determining the thermal conductivity of an insulating material, the temperatures were measured on both sides of a flat slab of 25 mm of the material and were 318.4 and 303.2 K. The heat flux was measured as 35.1 Calculate the btu thermal conductivity in and inA coffee, with a temperature of 60 o C, is pour in a glass with diameter of 10 cm and height of 13 cm . The coffee has a continuous heat transfer of 60 W. What is the temperature (in Celsius) of the surface of the glass if convective heat transfer , h, is 50 W/m2-K?A 50- cm - diamc tor pipeline in the Arctic carrics hot oil whcre the outor surfaco is mai ntained a 30°c and isr exposed to a surrounding tompera turc - IS C. A s pecial powder incu lation of thic k cm surrounds the pipe and has a the rmal conductivity 7mW/m°c . Of the conve ction heat - transfer coeffierent outsidu the of the pipc On 9 W /m °C. Estimate ene rgy las s from the pipe the per mcter of leng th .
- A thin, square steel plate, 10 cm on a side, is heated in a blacksmith’sforge to 800°C. If the emissivity is 0.60, what is the total rate of radiationof energy from the plate?(a) Calculate the heat flux through a sheet of aluminum 10 mm thick if the temperatures at the two faces are 300 and 100°C; assume steady-state heat flow. Given the thermal conductivity of aluminum is 247 WmK1. (b) Determine the heat loss per hour if the area of the sheet is 0.25 m?.A sphere of radius 4.3 mm is at 3499 K. Calculate the rate of radiation of energy (in W) by the sphere, if its emissivity is 1.