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- A 0.6-cm diameter mild steel rod at 38C is suddenly immersed in a liquid at 93C with hc=110W/m2K. Determine the time required for the rod to warm to 88C.Q2: A: The exterior wall of a single-story office building near Chicago is 3 m high and 15 m long. The wall consists of 100-mm face brick, 40-mm polystyrene insulating board. 150-mm lightweight concrete block, and an interior 16-mm gypsum. The wall contains three single-glass of 3 mm thickness windows 1.5 m high by 2 m long. Calculate the heat loss through the wall at design conditions if the inside temperature is (20 °C). The outside temperature is (-18 "C).A plane wall is 2m high and 3m wide and is 20cm thick. It is made of a material that has a thermal conductivity of 0.50W/m-K. A temperature difference of 60 degrees Celsius is imposed on the two large faces. Find the heat flux.
- Answer the problem "If the plant wants to heat the half-sphere of the previous problem keepingit on an insulated surface as shown in Fig. 2..." (use the other problem as reference)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 estimatesA 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?
- Calculate the specific heat capacity of 10 000 kg of sea water if the rise in temperature is 0.00255 ℃ and heat supplied is 100 000 J2. Two walls of cold storage plant are composed of an insulating material (0.25 kJ/hr-m-°C), 100 mm thick at the outer layer and material (3.5 kJ/hr-m-°C), 15 cm thick at inner layer. If the surface temperature at the cold side is 30°C and hot side is 250°C, find the heat flux.An oil storage tank has 20mm steel walls covered with 50mm of fiber glass insulation. if the oil temperature is kept at 150 degree Celsius, what is the rate of heat loss when the outside temperature is 20 degree Celsius and external air coefficient is 20W/m². How much would the heat loss be reduced by doubling the thickness of the insulation?
- On a winters day the outside temperature of a 15 inch thick concrete wall is -25F, the wall is 16 ft long and 10 ft high. How manu BTU are required to keep the inside of the wall at 75F? Assume walls thermal conductivity is 0.8BTU/h ft F. Show detailed solutions3. Compute for the Nusselt value of a natural convection in a small holding tank with a heating element at the bottom. The calculated Ra number is 2.37 x 10º.[2] A reservoir of hot water kept at 380K is well insulated except for a copper rod with a cross sectional area of 0.25 m? and a length of 0.50 meters. The rod is also well insulated except for its ends and the other end is in a second well insulated reservoir of water held at 280K. a) Determine the rate of heat flow through the copper rod. b) Calculate the temperature at the center of the rod (0.25 meters from either end). Then extend the process to find the temperature at each point 0.1m along the rod. c) Calculate the rate of entropy change at each end of the rod. d) Using your answer for (c), show that the statements "Heat flows spontaneously from high temperature to low temperature." and "Any spontaneous process causes the entropy of the universe to increase." are logically equivalent for situations with heat flow. e) Each reservoir of water holds 1 m of water. With a steady flow established, the power fails so that the heating and cooling of the water ceases. What are the…