Determine the resistance (in F-h/BTU) of a hollow cylinder with an inside and outside radius of 2 in and 2.1 in, respectively. The length of the cylinder is 3 ft while the thermal conductivity is 24 BTU/hr-ft-F.
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Determine the resistance (in F-h/BTU) of a hollow cylinder with an inside and outside radius of 2 in and 2.1 in, respectively. The length of the cylinder is 3 ft while the thermal conductivity is 24 BTU/hr-ft-F.
Correct Answer: 1.0784994169E-4 ± 1%
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- As a designer working for a major electric appliance manufacturer, you are required to estimate the amount of fiberglass insulation packing (k = 0.035 W/m K) that is needed for a kitchen oven shown in the figure below. The fiberglass layer is to be sandwiched between a 2-mm-thick aluminum cladding plate on the outside and a 5-mm-thick stainless steel plate on the inside that forms the core of the oven. The insulation thickness is such that the outside cladding temperature does not exceed 40C when the temperature at the inside surface of the oven is 300C. Also, the air temperature in the kitchen varies from 15Cto33C, and the average heat transfer coefficient between the outer surface of the oven and air is estimated to be 12.0W/m2K. Determine the thickness of the fiberglass insulation that is required for these conditions. What would be the outer surface temperature when the inside surface of the oven is at 475C?Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle Endeavour when it is in orbit. What happens when it reenters the earths atmosphere?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.
- The heat transfer coefficient between a surface and a liquid is 57 W/(m2K). How many watts per square meter will be transferred in this system if the temperature difference is 10C?Determine the resistance (in F-h/BTU) of a hollow cylinder with an inside and outside radius of 2 in and 2.1 in, respectively. The length of the cylinder is 6 ft while the thermal conductivity is 22 BTU/hr-ft-FIn a lab testing material samples to determine the thermal conductivity of the material. Now, the test specimens are 18.5 cm long by 14.4 cm wide and 0.26 cm thick. The sample is placed in a test device so that one of the large sides is maintained at 13, while the other large side is kept at -7. The heat transfer through the sample is measured to be 287 Watts. Determine the thermal conductivity. Give your answer to 2 decimal places.
- A team of students tests a material for its thermal conductivity (k). After 20 minutes in a heat box, the temperature is 48° C inside the box and 28° C on top of the material. The following data is true about this test: Area of material = .0225 m2 Thickness of material = .0127 m Light bulb = 25 W What is the thermal conductivity constant for the material? Calculate the amount of energy transferred through the material. Determine the R-value of the material. Based on your calculations, would the material be a reasonable choice for home insulation? Yes of NoA manufacturer of loose-fill cellulose insulating material provides a table showing the relationship between the thickness of the material and its R-value. The manufacturer’s data is shown in the accompanying table. R -value (m2 ⋅K/W) Thickness (mm) R -40 275 R -32 225 R -24 162 R- 19 132 R -13 88 Calculate the thermal conductivity of the insulating material. Also, determine how thick the insulation should be to provide R-values of a. R-30 b. R-20 11.9Determine the resistance of an aluminium coil of 102 cm as diameter consists of 15900 turns and the mean length per turn is 3450 cm. Take the electrical conductivity of the aluminium coil as 0.2 MS/m. Solution: Area of Cross-section of the Coil (in m2) Total Length (in m) The Resistance of the Coil (in Q)
- Determine the resistance of an aluminium coil of 174 cm as diameter consists of 14200 turns and the mean length per turn is 3531 cm. Take the electrical conductivity of the aluminium coil as 0.22 MS/m. Solution: Area of Cross-section of the Coil (in m2) 2.377 One possible correct answer is: 2.3778714795021 Total Length (in m) 501402 One possible correct answer is: 501402 The Resistance of the Coil (in Q) 0.62 One possible correct answer is: 0.95846222962277Determine the resistance of an aluminium coil of 183 cm as diameter consists of 14500 turns and the mean length per turn is 4883 cm. Take the electrical conductivity of the aluminium coil as 0.37 MS/m. Solution: Area of Cross-section of the Coil (in m²) Total Length (in m) The Resistance of the Coil (in 2) o search2-66 One end of a copper rod 30 cm long is firmly connected to a wall that is maintained at 200°C. The other end is firmly connected to a wall that is maintained at 93°C. Air is blown across the rod so that a heat-transfer coefficient of 17 W/m2 .°C is maintained. The diameter of the rod is 12.5 mm. The temperature of the air is 38°C. What is the net heat lost to the air in watts?