1.2 A concrete wall in a factory located in Canada has a thickness of 0.1 metres. The wall isexposed to a relatively cold breeze at a temperature of – 3.15°C through a convection heattransfer coefficient of 40 W/m2K. On the other side is calm air at 330 K, with a natural-convection heat transfer coefficient of 10 W/m K. You are required to work out the rate ofheat transfer per unit area.

Answered: Image /qna-images/answer/8ecb5e09-b17e-4301-9979-d261ac9903ab.jpg

Answered: 1.2 A concrete wall in a factory…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1.6 World energy consumption reached about 500 quadrillion Btus in 2010. Estimate the equivalent energy quantities in: barrels of oil, metric tons (tonnes) of coal, standard cubic feet of natural gas, gallons of reservoir water elevated 1000 m above sea level, kilograms of steam (saturated vapor) at 200°C, kilograms of hot water (saturated liquid) at 200°C, cubic meters of granite at 250°C.
A house has walls made out of steel with the following properties: Thickness 300 mm Density kg/m3 7800 Thermal Conductivity w/m-K 50 Specific Heat Capacity Embodied J/kg-K 500 MJ/kg 26 Energy Cost $/kg 0.70 The time that it will take, in hours, for the interior temperature to start changing after the exterior is exposed to a sudden temperature is:
You are asked to assess the validity of a power-generating device. The device supposedly operates steadily by receiving 256 kW via heat transfer at 4.5 °C, receiving 370 kW via heat transfer at 115 °C, and rejecting 200 kW via heat transfer at -180 °C. The device generates electrical power in response to these various heat transfers. a. determine its electrical power output, in kW. b. Is the device feasible? Does it violate 1st and/or 2nd law of thermodynamics?
In an experiment to measure the specific heat of material, a student first measured the masses of the following samples as given in Table 1. Table 1: Measurement of Mass Physical quantity measured in (g) Value Mass of Styrofoam 2.4 cup Mass of Styrofoam 62 cup + water Mass of Brass sample 15.3 Mass of Copper sample 62.5 and then recorded the temperatures of the above two samples, in Table 2. Table 2: Measured values of Temperatures Hot termperature ("C ) Sample Equilibrium cold temperature ( C) temperature ("C) Brass 99.8 26.5 24.5 Сopper 99.8 32 26 Answer the following questions using the data given in Table 1 and Table 2. (Please enter the answers with two digits after decimal) (a) Calculation of specific heat capacity of Brass: Calculated Quantities Mass of the water (in Values grams) Change in temperature lof the hot object ( ATobieca) °C) Change in temperature of water (ATwaer) (°C) Calculated specific heat of the object in (cal/g'C) (b) Calculation of the specific heat capacity…
In a company there are the following consumptions for energy and energetics. The company works 8hours a day and consumes an average of 10 kWh/day of electrical energy, its thermal energy production system(heating) works through the combustion of a gas that provides 111.76 kcal/h for each gram that isgas flaring, using an average of 0.25 lbm/h of gas.Fuel is also used in another thermal system that on average consumes 1 lbm/h, whose density is 1.1g/mL with calorific value of 1193.45 BTU/lbm. If the average costs for energy and energy are of$0.20/kcal. Determine the total cost of energy and energy for each work week (6 days per week).week)
A firearm can be modeled as a kind of heat engine, where the projectile acts as a piston that separates from the rest of the system during expansion. Consider a rifle with a 1.70 kg barrel made of iron [specific heat = 448 J/(kg °C)]. The rifle fires a 4.00 g bullet that exits the barrel with a speed of 350 m/s. When the propellant is ignited, 1.10% of the energy released goes into propelling the bullet (this is the thermal efficiency of the "engine"). The other 98.9% can be approximated as being entirely absorbed by the barrel, which increases in temperature uniformly for a short time before this energy is dissipated into the surroundings. What is this temperature increase (in °C)? (Round your answer to at least one decimal place.) °℃
A heat engine has a thermal efficiency of 40 percent and it produces 600 kJ of work. What is the heat input to the heat engine, in MJ? Report your answer to one decimal place.

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