Question 9 the dimensions of the faces of each block be 3 m by 2 m. Also, the conductivity of copper is 200 and the conductivity of iron is 300 K: If the left face of the copper block is A 20 cm thick block of copper is placed against a 40 cm block of iron. Let m K 100°C and the right face of the iron block is at 10°C, calculate: (a) the temperature between the blocks (the interface).

Question 9 the dimensions of the faces of each block be 3 m by 2 m. Also, the conductivity of copper is 200 and the conductivity of iron is 300 K: If the left face of the copper block is A 20 cm thick block of copper is placed against a 40 cm block of iron. Let m K 100°C and the right face of the iron block is at 10°C, calculate: (a) the temperature between the blocks (the interface).

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.10P: 1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss...

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1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?
A section of a composite wall with the dimensions shown below has uniform temperatures of 200C and 50C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA=70W/mK,kB=60W/mK, kC=40W/mK, and kD=20W/mK, determine the rate of heat transfer through this section of the wall and the temperatures at the interfaces.
2.55 A long, 1-cm-diameter electric copper cable is embedded in the center of a 25-cm-square concrete block. If the outside temperature of the concrete is 25oC and the rate of electrical energy dissipation in the cable is 150 W per meter length, determine temperatures at the outer surface and at the center of the cable.
1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.
2.51 Determine by means of a flux plot the temperatures and heat flow per unit depth in the ribbed insulation shown in the accompanying sketch.
2.3 The shield of a nuclear reactor is idealized by a large 25-cm-thick flat plate having a thermal conductivity of . Radiation from the interior of the reactor penetrates the shield and there produces heat generation that decreases exponentially from a value of at the inner surface to a value of at a distance of 12.5 cm from the interior surface. If the exterior surface is kept at 38°C by forced convection, determine the temperature at the inner surface of the field. Hint: First set up the differential equation for a system in which the heat generation rate varies according to .
The surface of a furnace wall is at a temperature of 1200°C. The outside wall temperature is 38°C. The furnace wall construction has 15 Cm of refractory material,), k = 1.73 W/m-K., and the outside wall is 1-cm steel, k = 44 W/m-K. What thickness of refractory brick must be used between the refractory material and the wall if the heat loss is not to exceed 0.7 kW/m2? The thermal conductivity of the brick is 0.34 W/m-K.
plz answer this ASAP,thx One surface of a copper plate that is 3 cm thick has a constant temperature of 400 ° C while the temperature of the other surface is kept constant at 100 ° C. Describe the temperature profile and how much heat is transferred across the plate ?, k copper = 380 watts/m.k with a cross -sectional area of 4 cm².
The rear window of a car is defrosted by the passage of warm air on the internal surface. If the warm air is at 40 °C and the internal convection transfer coefficient is 30 W/m²°C, what are the temperatures of the internal and external surfaces of the glass (4 mm thick) if the external air temperature is -10 °C and the convection coefficient is 65 W/m²°C?
The inside surface temperature of a glass oven door (0.5 m x 0.5 m x 0.001 m) is 180°C, the outside surface temperature is 25°C, and the thermal conductivity of glass is 1.4 W/(m•K) What is the rate of heat transfer?