A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.4 m x 1.9 m. On a certain day, the indoor temperatu 24°C and the outdoor temperature is 0°C. (a) What is the rate at which energy is transferred by heat through the glass? W (b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain constant?
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- An electrical current flows through a long bar, generating thermal energy at a rate uniform volumetric of q = 2 × 105 W/m 3. The bar is concentric with a hollow ceramic cylinder, creating an air-filled space between the two. If the external surface temperature cannot exceed 40 °C, what is the minimum speed that the ambient air should be blown? the neighborhood meets at 25 °C and the emissivity of the ceramic is 0.8. If the bar has an emissivity of 0.2, what is the bar surface temperature?A dual-pane window in a house is composed of two parallel panes of glass, each with an area of 2.23 m². Each pane of glass is 3.10 mm thick and the space between the panes is 12.5 mm thick and is filled with argon. (a) Calculate the heat flow through the window if the indoor temperature is 18.3°C and the outdoor temperature is -20.6°C (this is about -5°F). (b) Determine the temperature on the inside of the pane (this is in the argon-dilled region) closest to the outside of the house.Q2/ How much heat does 50g of aluminum give off as it cools from 100c° to 10c°? for aluminum c=88 J/Kg.c°.
- A glass of a hot water has an initial temperature 80°C, placed in a room where the temperature is 30°C. After one minute the water temperature drops to 70°C. What will be the temperature after 3 minutes? At what time the water cools down to 40°C?A double-pane glass window consists of two pieces of glass, each having athickness of 8 mm, with a thermal conductivity of k = 1.4 W⁄m ⋅ K . The twoglass panes are separated by an air gap of 10 mm, as shown in Figure 11.10 .Assuming the thermal conductivity of air to be k = 0.025 W⁄m ⋅ K , determinethe total R-value for this window. The total thermal resistance of the window is obtained by adding the resistance offered by each pane of glass and the air gap in the following manner:A long steel I-beam used in bridge construction has a length of 15.0 m. The beam may be exposed to temperatures as low as −22°C in the winter and as high as 33°C in the summer. What is the difference in length of the beam between these two temperature extremes? (Give the absolute value of the difference. Enter your answer in mm.)
- Briefly explain two mechanisms involved in heat conduction of materials.Q1: A. 6 kg of steel, specific heat capacity 500 J\Kg K, is heated from 59°F to 212°F C. How much heat is required?An insulated steam pipe having outside diameter of 3 cm is to be covered with two layers of insulation each having a thickness of 2.5 cm. the thermal conductivity of one material is 5 times that of the other assuming that the steam pipe surface temperature and outer air temperature remain fixed . how much change in heat transfer take place if the better insulating material is next to the pipe than it is on outer side?
- A nozzle is a device for increasing the velocity of a steadily flowing stream of fluid. At the inlet to a certain nozzle, the specific enthalpy of the fluid is 3320 kJ/kg and the velocity is 60 m/s. At the exit from the nozzle the specific enthalpy is 2530 kJ/kg. The nozzle is horizontal, and the heat supply, the heat loss, the work input, and the work output to or from the nozzle are all negligible. (a) Determine the velocity at the nozzle exit3. According to Newton's Law of cooling', the rate at which the heat is lost by a heated body is proportional to the difference in temperature between the body and the surrounding medium (when the temperatutre difference is very small). If a thermometer is taken outdoor, where the temperature is 6°C, from a room which temperature is 25C, and the reading drops 15°C in one minute, how long after its removal from the room will the reading be 8°C? after 45 secs what is the thermometer reading?4. An incandescent lamp has a tungsten filament whose resistance is 96 ohm at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source under which conditions the temperature is 24°C.