Engineering
Engineering, 07.08.2019 19:30, migos2377

Acircular heater of 0.2 m dia is used to heat oil at 20°c in a large tank. the heater has a uniform heat generation rate of 10 kw/m^2 by free convection . determine the average surface temperature if (i) hot surface is facing up and (ii) hot surface facing down

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Physics, 05.07.2019 00:20, ale414141
A) a closed insulated tank is used to heat 400 l of chemical for a production process. there is no loss of heat energy from the tank. given the density of the chemical is 1100 kg/m3, initial temperature of the chemical is 15°c, and the specific heat value of the chemical is 2.2 kj/(kg.k) how much heat energy is required to raise the temperature of the chemical (i) to 40°c? (15 marks) (ii) how long will it take to heat the chemical to 40°c using a 4 kw heater fully immersed in the chemical? assume 100 % efficiency for the heater. (10 marks) state the units for your answers.
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Engineering, 28.11.2019 06:31, elizabethseoane1829
Acircular ceramic plate that can be modeled as a blackbody is being heated by an electrical heater. the plate is 30 cm in diameter and is situated in a surrounding ambient temperature of 15°c where the natural convection heat transfer coefficient is 12 w/m2·k. if the efficiency of the electrical heater to transfer heat to the plate is 80%, determine the electric power that the heater needs to keep the surface temperature of the plate at 220°c.
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