15819.Consider a 2-m-high and 2-m-wide double-158pane window consisting of two 4-mm-thicklayers of glass (k= 1.0 W/m-°C) separated by a10-mm-wide stagnant air space (k=0.025W/m°C). During the daytime, the room ismaintained at 25°C while the temperature of theoutdoors is (-5°C). Take the convection heattransfer coefficients on the inner and outersurfaces of the window to be h = 10W/m² - °Candh2 = 25W/m² . °C and disregard any heat transfer%3D%3Dby radiation.安苏白919158Glass安艺919158410 4mm 安苏919158Glass410 4mm安苏919158Frame(a) Draw the thermal resistance network.91915850E10through this double-pane window.91915850E106(b) Determine the steady rate of heat transfer(c) the temperature of itsin苏白9191surface.and outer

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19.Consider a 2-m-high and 2-m-wide double- pane window consisting of two 4-mm-thick layers of glass (k= 1.0 W/m-°C) separated by a 10-mm-wide stagnant air space (k=0.025 W/m°C). During the daytime, the room is maintained at 25°C while the temperature of the outdoors is (-5°C). Take the convection heat transfer coefficients on the inner and outer surfaces of the window to 10W/m² . °Cand be h h2 = 25W/m² - °C and disregard any heat transfer %3D by radiation. 安艺。 919158 Glass 919158 4 10 4mm

19.Consider a 2-m-high and 2-m-wide double- pane window consisting of two 4-mm-thick layers of glass (k= 1.0 W/m-°C) separated by a 10-mm-wide stagnant air space (k=0.025 W/m°C). During the daytime, the room is maintained at 25°C while the temperature of the outdoors is (-5°C). Take the convection heat transfer coefficients on the inner and outer surfaces of the window to 10W/m² . °Cand be h h2 = 25W/m² - °C and disregard any heat transfer %3D by radiation. 安艺。 919158 Glass 919158 4 10 4mm

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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[2] Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m °C) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m- °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is -5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1 = 10 W/m2.°C and h2 = 25 W/m2.°C, and disregard any heat transfer by radiation. Glass 3 12 3 mm Frame a.) Steady rate of heat transfer. А. 318 W B. 214 W C. 114 W D. 321 W b.) Temperature of its inner surface. A. 25°C B. 17.5°C С. 15°С D. 19.2°C
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A can of engine oil with a length of 150 mm and a diameter of 100 mm is placed vertically in the trunk of a car. In a hot summer day, the temperature in the trunk is 43°C. If the surface temperature of the can is 17°C, determine heat transfer rate from the can surface. Neglect the heat transfer from the ends of the can.
The boiling temperature of nitrogen at atmosphericpressure at sea level (1 atm) is -196°C. Therefore, nitrogenis commonly used in low-temperature scientific studies sincethe temperature of liquid nitrogen in a tank open to the atmosphereremains constant at -196°C until the liquid nitrogen inthe tank is depleted. Any heat transfer to the tank results inthe evaporation of some liquid nitrogen, which has a heatof vaporization of 198 kJ/kg and a density of 810 kg/m3 at1 atm.Consider a 4-m-diameter spherical tank initially filledwith liquid nitrogen at 1 atm and -196°C. The tank isexposed to 20°C ambient air with a heat transfer coefficientof 25 W/m2·K. The temperature of the thin-shelled sphericaltank is observed to be almost the same as the temperatureof the nitrogen inside. Disregarding any radiation heatexchange, determine the rate of evaporation of the liquidnitrogen in the tank as a result of the heat transfer from theambient air.
What must be the Height of a 200mm diameter vertical pipe carrying hot liquid so that the surrounding area becomes 38 °C? Note that the rate of convection is 6 KWatts and the surface of the plate is around 90°C. provide an answer in meters
A 2.5-m-tall steel cylinder has a cross-sectional area of 1.5 m2. At the bottom, with a height of 0.5 m, is liquid water, on top of which is a 1-m high layer of gasoline, relative density of 0.8. The gasoline surface is exposed to atmospheric air at 101 kPa. What is the volume of the cylinder?
Problem 1. Consider a 0.8-meter-high and 1.5-meter-wide double-pane window consisting of two 4-mm-thick layers of glass (k = 0.78 W/m-K) separated by a 10-mm-wide stagnant air space (k = 0.026 W/m-K), as shown in Fig. 1. The room temperature is maintained at T; = 20°C, while the temperature of the outdoors is To = -10°C. Assume that the convection heat transfer coefficients on the inner and outer surfaces of the window are h₂ = 10 W/m²-K and ho= 40 W/m²-K. (a) Sketch the thermal resistance network of the problem and calculate the in- dividual thermal resistances. (b) Determine the steady-state rate of heat transfer through the double-pane window. (c) Calculate the temperature at the window's inner surface (facing the room).
A 3 m internal diameter spherical tank made of 1 cm thick stainless steel (k =15 W/mK) is used to store water at 4℃, as shown in Figure 2.2. Inner surfaceof the tank is 4℃, while the outer surface of the tank is painted with blackcolour paints with emissivity, ? = 0.88 measured at temperature 5℃. It islocated outdoor at 40℃ and is subjected to wind at 25 km/h. Determine the total heat transfer rate to the ice water.
Palm oil with a density of 1200 kg/m3 and the specific heat of 2 kJ/(kg.K) is to be heated from 20oC to 80oC before further processing. The oilplaced in a vessel (vessel) cylindrical upright with a diameter of 2 meters.The height of the oil vessel inside is 2 meters. For this purpose, an electric heating element with an electrical resistance type of heat is used.The electrical resistance used is a 2 mm diameter conductor wire wrappedwith magnesium oxide material with a thermal conductivity of 0.4 W/(m.K) thick 2.5 mm, then coated with the outermost metal 0.5 mm thick. Occurring power density on the outermost metal layer should not be more than 25 kW/m2. Warm-up time is expected to be only about 1.5 hours. Calculate: a) Required electrical power? (in kW) b) Rating of the heater by meter length? c) Maximum temperature of the heater element?
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm) is -196°C. Therefore, nitrogen is commonly used in low temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until the liquid nitrogen in the tank is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 3-m-diameter spherical tank initially filled with liquid nitrogen at 1 atm and 196°C. The tank is exposed to 22°C ambient air with a heat transfer coefficient of 22 W/m2 · °C. The temperature of the thin-shelled spherical tank is observed to be almost the same as the temperature of the nitrogen inside. Disregarding any radiation heat exchange, determine the rate of evaporation of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air in kg/sec. Answer in…
The rectangular wall of a furnace consists of 3in. fire clay brick surrounded by 0.25in. of steel on the outside. There are six 0.25in.diameter mild steel bolts per square foot connecting the steel and the brick. The furnace is surrounded by 70°F air (with a film coefficient of 1.65 Btu/hr-ft²-°F), while the inner surface of the brick is maintained at a constant 1000°F. Determine the heat flux per square foot through this wall?