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A 2.37 m wide by 1.17 m high metal plate must be insulated to prevent contact burn injuries. If the
{kins = 0.036 W/m∙K}
![A 2.37 m wide by 1.17 m high metal plate must be insulated to prevent contact burn injuries.
If the heat transfer rate is 123 W and the temperature across the insulation must be reduced
from 87.4°C to 42.7°C, what is the minimum thickness (in cm) of insulation required [round
your final answer to two decimal places]?
{kins = 0.036 W/m.K}
H
H₂
L
Insulation
W
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- (a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?A warms transfers energy by conduction through its blubber at the rate of 150 W when immersed in 1.00 water. The walrus's internal core temperature is 37.0 and it has a surface area of 2.00 m2. What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood?One process for decaffeinating coffee uses carbon dioxide ( M=44.0 g/mol) at a molar density of about 14,0 mol/m3 and a temperature of about 60 . (a) Is CO2 a solid, liquid, gas, or supercritical fluid under those conditions? (b) The van der Waals constants for carbon dioxide are a=0.3658 Pa m6/mol2 and b=4.286105 m3/mol. Using the van der Waals equation, estimate pressure of CO2 at that temperature and density. `
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- Given a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so that there is negligible heat loss through it. thermal conductivity of copper: kcu = 385 W/m K Calculate the following up to three (3) significant figures: (1) Thermal resistance Rth of the Cu bar, Ans = (2) Conduction heat current HC, Ans = (3) Temperature gradient AT/Ax, Ans = (4) Temperature T of the Cu bar 0.5 m from the hot end, Ans in W in C/m in K/W in CGiven a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so that there is negligible heat loss through it. thermal conductivity of copper: kcu = 385 W/m K Calculate the following up to three (3) significant figures: (1) Thermal resistance Rth of the Cu bar, Ans = (2) Conduction heat current Hc, Ans = in W in K/W(a) Calculate the rate of heat conduction (in W) through house walls that are 11.5 cm thick and that have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The surface area of the walls is 150 m2 and their inside surface is at 20.0°C, while their outside surface is at 5.00°C. 1565.21 (b) How many 1 kW room heaters would be needed to balance the heat transfer due to conduction? (Round your answer to the next whole integer.) 2 1 kW room heaters
