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One side of a copper block 4 cm thick is maintained at 175oC. The other side...
Find the heat-loss rate through a slab of wood 1.5 cm thick, if one surface is at 25 °C and the other at 5.0°C.
Find the heat-loss rate through a slab of wood 1.5 cm thick, if one surface is at 25 °C and the other at 5.0°C. Find the heat-loss rate through a slab of Styrofoam 1.5 cm thick, if one surface is at 25 °C and the other at 5.0°C.
A cork slab 10 cm thick has one face at -12 degrees C and the other...
A cork slab 10 cm thick has one face at -12 degrees C and the other face at 21 degrees C. If the mean thermal conductivity of the cork in this temperature range is 0.042 J/s m degree C, what is the rate of heat transfer through 1 m^2 of wall?
Q. 4: (20 pts) A1-mm-thick copper plate (k = 386 W/m - °C) is sandwiched between...
Q. 4: (20 pts) A1-mm-thick copper plate (k = 386 W/m - °C) is sandwiched between two 5-mm-thick epoxy boards (k = 0.26 W/m - °C) that are 15 cm 20 cm in size. If the thermal contact conductance on both sides of the copper plate is estimated to be 6000 W/m °C, determine the error involved in the total thermal resistance of the plate if the thermal contact conductances are ignored. Copper Epoxy ( Epoxy Dh Heat flow
4. In regions where there is a low elevation, houses are usually built on cement slabs...
4. In regions where there is a low elevation, houses are usually built on cement slabs because base ments cannot be dug. A typical cement slab for a conventional home is 10 cm thick. Consider such a slab to be covered with linoleum 1 cm thick. The lower surface of the slab is at 10°C. The upper surface of the linoleum is 23°C. a. Determine the heat flow per unit area through the floor. b. Calculate the interface temperature between...
5) A certain automobile has a 4 mm thick glass window with a surface area of...
5) A certain automobile has a 4 mm thick glass window with a surface area of 2.8 m². The outside temperature is 32°C while the passenger compartment is maintained at 22°C. The convection heat transfer coefficient on the exterior window surface is h = 90 W/(m²K). Determine the heat gain through the windows when the interior convection heat transfer coefficient is h = 15 W/(m²K). By controlling the air flow in the passenger compartment the interior heat transfer coefficient can...
11) Consider a large 5-cm-thick brass plate (k111 W/m-K) in whic uniformly at a rate of 200,000W Im3. One side of th...
11) Consider a large 5-cm-thick brass plate (k111 W/m-K) in whic uniformly at a rate of 200,000W Im3. One side of the plate is insulated while the other exposed to an environment at 25 C with a heat transfer coefficient of What is the relationship between the maximum plate temperature as W/m2.K. function of the heat transfer coefficient." 1 point
11) Consider a large 5-cm-thick brass plate (k111 W/m-K) in whic uniformly at a rate of 200,000W Im3. One side...
A33m by 6 m wall consists of a long 18 cm cm cross-section of horizontal bricks...
A33m by 6 m wall consists of a long 18 cm cm cross-section of
horizontal bricks (k = 0.72 W/m 0C) separated by b30 y a 3 cm thick
plaster layer (k = 0.22 W/m 0C). There are also a 2 cm thick
plaster layers on each side of the wall and a 2 cm thick rigid foam
(k = 0.026 W/m "C) on the inner side of the wall. The indoor and
outdoor temperatures are 22 "C and -...
A block of material with a cross-sectional area of 15 cm2 and length of 8.0 cm...
A block of material with a cross-sectional area of 15 cm2 and length of 8.0 cm is at hand. A temperature difference of 30 ̊C is established and maintained across the block. Find the rate of heat flow through it if: (2 marks) The material is copper (K = 397 Js-1m-1C-1). The material is air (K = 0.0234 Js-1m-1C-1). The material is wood (K = 0.08 Js-1m-1C-1).
(b) The brick wall of a building has dimensions of 4 m by 10 m, and it is 15 cm thick with a coefficient of thermal con...
(b) The brick wall of a building has dimensions of 4 m by 10 m, and it is 15 cm thick with a coefficient of thermal conductivity of 0.8 W.m1ec1. How much heat flows through the wall in a 12-hour period when the average inside and outside temperatures are 20 °C and 5 °C respectively? Will a 2 kW heater operating in the room compensate for the heat loss? Justify your answer. A layer of insulating material of thickness 5...
As shown in the Figure, a composite material consists of a 0.9 cm layer of glass...
As shown in the Figure, a
composite material consists of a 0.9 cm layer of glass (pyrex) (A)
and a 0.4 cm layer of Teflon (B). The material separates two
gasses; one inside at Ti = 270°C with convective coefficient hi =
60 W/(m2 K) and one outside with convective coefficient ho = 28
W/(m2 K). It is know that the temperature of the exposed side of
the Teflon is Ts,o = 40°C. The two layers are not in perfect...
Q. 4: (20 pts) A1-mm-thick copper plate (k = 386 W/m - °C) is sandwiched between two 5-mm-thick epoxy boards (k = 0.26 W/m - °C) that are 15 cm 20 cm in size. If the thermal contact conductance on both sides of the copper plate is estimated to be 6000 W/m °C, determine the error involved in the total thermal resistance of the plate if the thermal contact conductances are ignored. Copper Epoxy ( Epoxy Dh Heat flow
4. In regions where there is a low elevation, houses are usually built on cement slabs because base ments cannot be dug. A typical cement slab for a conventional home is 10 cm thick. Consider such a slab to be covered with linoleum 1 cm thick. The lower surface of the slab is at 10°C. The upper surface of the linoleum is 23°C. a. Determine the heat flow per unit area through the floor. b. Calculate the interface temperature between...
5) A certain automobile has a 4 mm thick glass window with a surface area of 2.8 m². The outside temperature is 32°C while the passenger compartment is maintained at 22°C. The convection heat transfer coefficient on the exterior window surface is h = 90 W/(m²K). Determine the heat gain through the windows when the interior convection heat transfer coefficient is h = 15 W/(m²K). By controlling the air flow in the passenger compartment the interior heat transfer coefficient can...
11) Consider a large 5-cm-thick brass plate (k111 W/m-K) in whic uniformly at a rate of 200,000W Im3. One side of the plate is insulated while the other exposed to an environment at 25 C with a heat transfer coefficient of What is the relationship between the maximum plate temperature as W/m2.K. function of the heat transfer coefficient." 1 point
11) Consider a large 5-cm-thick brass plate (k111 W/m-K) in whic uniformly at a rate of 200,000W Im3. One side...
A33m by 6 m wall consists of a long 18 cm cm cross-section of
horizontal bricks (k = 0.72 W/m 0C) separated by b30 y a 3 cm thick
plaster layer (k = 0.22 W/m 0C). There are also a 2 cm thick
plaster layers on each side of the wall and a 2 cm thick rigid foam
(k = 0.026 W/m "C) on the inner side of the wall. The indoor and
outdoor temperatures are 22 "C and -...
(b) The brick wall of a building has dimensions of 4 m by 10 m, and it is 15 cm thick with a coefficient of thermal conductivity of 0.8 W.m1ec1. How much heat flows through the wall in a 12-hour period when the average inside and outside temperatures are 20 °C and 5 °C respectively? Will a 2 kW heater operating in the room compensate for the heat loss? Justify your answer. A layer of insulating material of thickness 5...
As shown in the Figure, a
composite material consists of a 0.9 cm layer of glass (pyrex) (A)
and a 0.4 cm layer of Teflon (B). The material separates two
gasses; one inside at Ti = 270°C with convective coefficient hi =
60 W/(m2 K) and one outside with convective coefficient ho = 28
W/(m2 K). It is know that the temperature of the exposed side of
the Teflon is Ts,o = 40°C. The two layers are not in perfect...
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