Thermal conductivity is lower for (a) wood (b) air (c) water at 100°C (d)steam at 1 bar
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Thermal conductivity is lower for
(a) wood
(b) air
(c) water at 100°C
(d)steam at 1 bar
Step by step
Solved in 2 steps
- A cylindrical liquid oxygen (LOX) tank has a diameter of 1.22 m, a length of 6.1 m, and hemispherical ends. The boiling point of LOX is -179.4C. An insulation is sought that will reduce the boil-off rate in the steady state to no more than 11.3 kg/h. The heat of vaporization of LOX is 214 kJ/kg. If the thickness of this insulation is to be no more than 7.5 cm, what would the value of its thermal conductivity have to be?Thermal conductivity is lower for (a) wood (b) air (c) water at 100°C steam at 1 bar2000kg cast iron housing at 450 degree Celsius is quenched in 5000kg of water at 15 degree C. What is the amount of heat transferred to water, use specific heat of water to be 4.18 kJ/kg.K and specific heat of iron to be 0.42 kJ/kg.K
- The physics of the conduction heat transfer of thermosses phenomenon and the mathematical model should be discussed.A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.4 m × 1.8 m. On a certain day, the indoor temperature is 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? J(a) The temperature at the surface of the heating rod, T1. (b) If the salt solution temperature is 300 degree Celcius, what is the value of convection heat transfer coefficient, h of the salt solution ? (c) If the heating rod is not covered by metallic cylinder and corresponds to the result of part (a) and (b), how much the rate of energy transfer to the salt solution ? (d) Compare and discuss the difference of heat transfer with and without the matallic cylinder.
- Define and briefly elaborate the terms listed below, support your elaboration with mathematical equations and illustrations where necessay 4. Prandtl, Schmidt, Lewis, Nusselt, and Sherwood number 5. Mole fraction of species and mass fraction of species. 6. Critical radius of insulation related to heat transfer in pipes.3.4 Estimate the rate of heat loss due to radiation from a covered pot of water at 95 ° C. How does this compare with the 60 W that is lost due only to convection and conduction losses? What amount of energy input would be needed to maintain the water at its boiling point for 30 minutes? The polished stainless steel pot is cylindrical, 20 cm in diameter and 14 cm high, with a tight-fitting flat cover. The air temperature in the kitchen is about 25 ° C. State any assumptions you make in deriving your estimatesP3. After a particularly cold night, Alice leaves a tub of water outside. You may consider the ground and air to have temperatures of Te = -10°C and Th = 10°C respectively. How thick is the layer of ice that forms at the bottom of the tub of water, after the tub has been left outside for a long time? The tub of water initially has a layer of water of thickness ho 10 cm. You may assume that the ground and air remain at a constant temperature throughout, and that the side lengths of the tub a, b » ho, i.e. the heat conduction is one- dimensional. Density of ice and water are pice = 920 kg/m³ and pw = 1000 kg/m³. Ice and water have thermal conductivities of kice = 2.22 W K-1 m' -1 and kw 0.556 W K-1 m' -1.
- (a) The heating power generated by the nuclear heating rod and the inner temperature of the metallic cylinder, T2. (b) The temperature liquid X, which is located between the nuclear heating rod and the meatllic cylinder, Tliquid. (c) The temperature at the surface of the heating rod, T1. (d) If the salt solution temperature is 300 degree Celcius, what is the value of convection heat transfer coefficient, h of the salt solution ? (e) If the heating rod is not covered by metallic cylinder and corresponds to the result of part (c) and (d), how much the rate of energy transfer to the salt solution ? (f) Compare and discuss the difference of heat transfer with and without the matallic cylinder.A polished stainless steel sphere (r= 5cm) is at a temperature of 540 C. The ambier air is at 20 C. What is the instantaneous heat transfer rate?(3) The thermal conductivity of helium at 400 K is 0.176 W m-! K-1. Knowing only this datum, estimate the thermal conductivity of helium at 800 K. Compare your estimate to the value obtained from the figure below. 06 as 02 01 co CO.N A HCI Cl, 200 400 00 Temperature, K 1200 1400 600 What do you conclude about the equation that you used for your estimate?