Engineering

Engineering, 04.07.2019 18:10, QueenLife4869

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

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Engineering, 05.10.2019 03:10, oliviaciscooc

The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka = 30 w/m·k and kc = 65 w/m·k, and known thickness, la = 0.35 m and lc = 0.25 m. the third material, b, which is sandwiched between materials a and c, is of known thickness, lb = 0.25 m, but unknown thermal conductivity kb. under steady-state operating conditions, measurements reveal an outer surface temperature (on outer surface of material c) of ts,o = 22◦c, an inner surface temperature (on inner surface of material a) of ts,i = 600◦c, and an oven temperature of t[infinity] = 800◦c. if the inside convection coefficient h = 25 w/m2 ·k, what is the value of kb?

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Engineering, 05.10.2019 11:30, notashley1703

Awall 2 cm thick is to be constructed from material that has an average thermal conductivity of 1,3 w/m.°c. the wall is to be insulated with material having an average thermal conductivity of 0.35 w/m.ºc, so that the heat loss per square meter will not exceed 1830 w. assuming that the inner and outer surface temperatures of the insulated wall are 130°c and 30°c, calculate the thickness of insulation required.

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Engineering, 05.10.2019 13:30, omarabady

Acomposite wall consists of a 10-cm-thick layer of building brick of thermal conductivity k = 0.7 w/(m • °c) and 3-cm-thick plaster of thermal conductivity k = 0.5 w/(m • °c). an insulating material of thermal conductivity k = 0.08 is to be added to reduce the heat transfer through the wall by 70 percent. determine the thickness of the insulating layer.

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Physics, 24.10.2019 01:50, kx85DirtbikeRider

Awall in a house contains a single window. the window consists of a single pane of glass whose area is 0.17 m2 and whose thickness is 2.3 mm. treat the wall as a slab of the insulating material styrofoam whose area and thickness are 15.00 m2 and 0.080 m, respectively. heat is lost via conduction through the wall and the window. the temperature difference between the inside and outside is the same for the wall and the window. of the total heat lost by the wall and the window, what is the percentage lost by the window? (the thermal conductivity for glass window is kg = 0.80 j/(s·m·c°), and the thermal conductivity for styrofoam is ks = 0.010 j/(s·m·c°

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