A 5-cm-external-diameter, 10-m-long hot water pipe at 80°C is losing heat to the surrounding air at 5°C by natural convection with a heat transfer coefficient of 25 W/m2 °C. Determine the rate of heat loss from the pipe by natural convection, in W.
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- An aluminum plate, with dimensions of 3 cm × 3 cm × 5 cm (length, width, and thickness, respectively), is exposed to a thermal energy source that puts out 150 J every second. The density of aluminum is 2700 kg⁄m3 . Assuming no heat loss to the surrounding block, determine the temperature rise in the plate after 10 seconds.Consider hotdog being cooked in boiling water in a pan. Would the heat transfer be modeled as one-dimensional or two-dimensional? Would the heat transfer be steady or transient? Explain.One person can serve a quick drink of 5 cm diameter and 12 cm high cans for their guests.put it in the deep freezer at –20 °C in order to cool it. 25 °C initiallyThe heat transfer coefficient on the box surface at a uniform temperature is 15 W/m².°C. Physical beverage canproperties of ρ=840 kg/m3, taking cp=3.81 kJ/kg.°C, k=0.75 W/m.°C and α=1.3x10⁻⁷ m²/s as the centerthe time required for the temperature to reach 5 °C and the maximum amount of heat transferred.calculate.
- A 20-cm diameter copper ball is to be heated from 110°C to an average temperature of 170°C in 90 minutes. Taking the average density and specific heat of copper in this temperature range to be p=8950 kg/m and Cp=0.395 kJ/kg • °C, respectively, determine the total amount of heat transfer to the copper ball in kj (Area of sphere: TID2; Volume of sphere=TTD/6)? A 88.64 kJ B 886.4 kl 78.84 kJ D 788.4 kJA cool box made of a material, having Thermal Conductivity of 0.22 W/m.°C has a total area of 3.9 m² and its walls have an average thickness of 7cm. The box contains ice and glass-bottled beverages at the freezing point of water. The inside part of the box is kept cold by melting ice. How much ice (in kg) melts in 2hours if the icebox is kept in a room at 120°F?Hot air at 79.0 oC is blown over a 3-m by 5-m flat surface at 34.9 oC. If the average convection heat transfer coefficient is 58.0 W/m2 oC, determine the rate of heat transfer from the air to the plate, in W. Please keep one decimal and take positive value for the final answer.
- Q2/ The inner and outer surfaces of a 0.5-cm- thick 2-m x2-m window glass in winter are 10°C and 3°C, respectively. If the thermal conductivity of the glass is 0.78 W/m - °C, determine the amount of heat loss, in kJ, through the glass over a period of 5 hours. What would your answer be if the glass were I cm thick? Answers: 78,624 kJ, 39,312 kJ.A pump is used for pumping water from lake at height of 100 m consuming power of 60 kW. Inlet pipe and exit pipe diameters are 150 mm and 180 mm respectively. The atmospheric temperature is 293 K. Determine the temperature of water at exit of pipe. Take specific heat of water as 4.18 kJ/kg. KA ball with diameter of 4 inches, is suspended in the middle of a room at 530°R. The ball's surface is maintained at a temperature of 700°R If the convection heat transfer coefficient is 0.04 kW/m2-°C and the emissivity of the surface is 0.7, determine the total rate of heat transfer from the ball.