Determine the resistance of an aluminium coil of 183 cm as diameter consists of 13600 turns and the mean length per turn is 3524 cm. Take the electrical conductivity of the aluminium coil as 0.26 MS/m.
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- Consider a house that has a 10-m x 40-m base and a 4-m-high wall. All four walls ofthe house have an R-value of 2.50 m2 · °C/W. The two 10-m x 4-m walls have nowindows. The third wall has four windows made of 0.5-cm-thick glass (k = 0.78 W/m ·°C), 2 m x 2 m in size. The fourth wall has the same size and number of double-panedwindows, with a 1.2-cm-thick stagnant air space (k = 0.026 W/m ·°C) enclosedbetween two 0.5-cm-thick glass layers. The thermostat in the house is set at 22 °C andthe average temperature outside at that location is 2°C during the four months longheating season, Solve for the money this household will save per heating season byconverting the single-pane windows to double-pane windows. Consider that the houseis electrically heated and the price of electricity is $0.10/kWh.An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if Tb.l.=80 F , To= -10 F , and Uwall=0.143 Btu/hr.ft2.F ? True or falseTo cool hot oil, an engineer has suggested that the oil be pumped through a pipe submerged in a nearby lake. The pipe (external diameter = 15 cm) will be placed in the horizontal direction. The temperature of the outer surface of the pipe averages 125 ° C. The surrounding water temperature is assumed to be constant at 15 ° C. Pipe length 100 m. If it is assumed that there is no water movement. a. Determine the convective heat transfer coefficient of the outer pipe surface to the water. = ..... Watt / (m² ° C) b. Determine the heat transfer rate from the pipe to the water. = ..... kW
- Q4 A transistor with a height of 04 cm and a diameter of 0.6 cm is maunted in a circuit board. The transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 W/m2 The air temperature is 55'C and the transistor case temperature is not to exceed 70C. Determine the name of power this transistor cun dispute sally. Disregard any heat transfer fer the transistor base. Your solution mist state government questions and associated assumptions, illustration and step by step execution of the overall solution.You want to increase the heat flux dissipated by a tube, OD = 2.5 cm, by placing cooling fins circular. The thickness, height and thermal conductivity of the fins are: 1mm, 1.25 cm and 160 W/mC, respectively. The fins are equally spaced such that there are 100 fins for every meter of tube length. If the The outer surface temperature of the tube is 170 C, the ambient temperature is 30 C, and the transfer coefficient of heat is h = 200 W/m2K, determine the increase (percentage) in the heat flux dissipated by the tube by placing the cooling fins. Take the efficiency of each fin to be 85%.Consider a house that has a 10-m × 20-m base and a 4-m-high wall. All four walls of the house have an R-value of 2.31 m2 · °C/W. The two 10-m × 4-m walls have no windows. The third wall has five windows made of 0.5-cm-thick glass (k = 0.78 W/m · °C), 1.2 m × 1.8 m in size. The fourth wall has the same size and number of windows, but they are double paned with a 1.5-cm-thick stagnant air space (k = 0.026 W/m · °C) enclosed between two 0.5-cm-thick glass layers. The thermostat in the house is set at 22°C and the average temperature outside at that location is 8°C during the seven-month long heating season. Disregarding any direct radiation gain or loss through the windows and taking the heat transfer coefficients at the inner and outer surfaces of the house to be 7 and 15 W/m2 · °C, respectively, determine the average rate of heat transfer through each wall.
- An external wall of a building has a U value of 0.50 W/m^2K. The indoor temperature is21 degreesC and the outdoor temperature is -2.0 degreesC. If the combined surface heat transfer coefficient (radiation plusconvection) of the outside wall is 12 W/m^2K, determine its surfacetemperature. answer = -1.04degreesC please show all workingsIP Heat Transport in the Human Body The core temperature of the human body is 37.0 ∘C∘C, and the skin, with a surface area of 1.40 m2m2, has a temperature of 34.0 ∘C∘C. Find the rate of heat transfer out of the body under the following assumptions: (i) The average thickness of tissue between the core and the skin is 1.20 cmcm; (ii) the thermal conductivity of the tissue is that of water. Express your answer using two significant figures. Without repeating the calculation of part A, what rate of heat transfer would you expect if the skin temperature were to fall to 31.0 ∘C∘C? Express your answer using two significant figures.A hot steel plate with a surface area of 1.93 m2 and a constant surface temperature of 169°C is exposed to ambient air at 21°C. If the convection heat transfer coefficient is 17.1 W/m2· K, what is the rate of heat transfer (in W) from the plate to the air [round your final answer to zero decimal places]?