A 0.75-m x 1.5-m window is constructed of 6-mm-thick glass. On a cold night, the inside and outside surface temperatures of the glass are 16°C and -24°C, respectively. (a) What is the rate of heat loss through the glass?
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- A horizontal, 3-mm-thick flat-copper plate, 1-m long and 0.5-m wide, is exposed in air at 27C to radiation from the sun. If the total rate of solar radiation absorbed is 300 W and the combined radiation and convection heat transfer coefficients on the upper and lower surfaces are 20 and 15W/m2K, respectively, determine the equilibrium temperature of the plate.Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.A 0.6-cm diameter mild steel rod at 38C is suddenly immersed in a liquid at 93C with hc=110W/m2K. Determine the time required for the rod to warm to 88C.
- A furnace wall consists of 2 ft of brick . The brick has athermal conductivity of 0.6 Btu/ hr sq ft ( ° F /ft), a specific heat of0.2 Btu/ lb ° F, and a density of 110 lb/cu ft. The temperature atthe inside surface of the wall is 1100 ° F , and at the outside surface,200 ° F .(a) Calculate the thermal diffusivity of the brick .(b) Calculate the heat loss per hour through a wall 10 ft high and10 ft long(c ) CalculateA picture window has dimensions of 1.40 m * 2.50 mand is made of glass 5.20 mm thick. On a winter day, the temperatureof the outside surface of the glass is -20.0°C, while the temperatureof the inside surface is a comfortable 19.5°C. (a) At whatrate is heat being lost through the window by conduction? (b) Atwhat rate would heat be lost through the window if you coveredit with a 0.750-mm-thick layer of paper (thermal conductivity0.0500 W/m . K)?A brass plate has a circular hole whose diameter is slightly smaller than the diameter of an aluminum ball. Ifthe ball and the plate are always kept at the same temperature,(a) should the temperature of the system be increased or decreasedin order for the ball to fit through the hole? (b) Choose the bestexplanation from among the following:I. The aluminum ball changes its diameter more with temperature than the brass plate, and therefore the temperatureshould be decreased.II. Changing the temperature won’t change the fact that the ballis larger than the hole.III. Heating the brass plate makes its hole larger, and that willallow the ball to pass through.
- Question Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain.(a) What is the rate of heat transfer through a wall that is 2 m high by 2.5 m wide?(b) Sketch the temperature distribution.QUESTION 3 A rectangular window in a home has a length of 1.5 m and a height of 0.80 m. If the window allows heat to escape from the home at a rate of 2,000 watts, how thick must the window be if the inside temperature of the home is 220 c and the outside temperature is 3.0°C? (Assume that the coefficient of thermal conduction of glass is 0.80 W/mK.) а. 7.1 mm b. 11 mm C. 9.1 mm d. 124 mm e. 8.1 mm
- a hollow styrofoam cubical box, which is perfectly insulated at the bottom, has a length of 2-m on each side and an inside surface temperature of -10 C. What should be the conduction thermal resistance at the top surface of the box in K/w if the heat load inside the box must be kept less than or equal to 500 W when the outside surface temperature of the box is 35 C? the thermal Conductivity of styrofoam is 0.030 W/m kQuestion 1.2:Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain. (03)(I)Why is the thermal conductivity of superinsulation orders of magnitude lower than the thermal conductivity of ordinary insulation. (ii) Consider two walls of a house that are identical except that one is made of 10cm thick wood while the other is made of 25cm thick through which wall lose more heat in winter.