MindTap Engineering, 1 term (6 months) Printed Access Card for Dunlap's Sustainable Energy, SI Edition, 2nd
2nd Edition
ISBN: 9781337551779
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 1, Problem 19P
To determine
Find the power plant’s rate of coal consumption.
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MindTap Engineering, 1 term (6 months) Printed Access Card for Dunlap's Sustainable Energy, SI Edition, 2nd
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- A gas undergoes a cycle in a piston-cylinder assembly consisting of the following three processes: Process 1-2: Constant pressure, p = 1.4 bar, V₁ = 0.028 m³, W12 = 10 kJ Process 2-3: Compression with pV = constant, U3 = U₂ Process 3-1: Constant volume, U₁ - U3 = -25 kJ There are no significant changes in kinetic or potential energy. (a) Calculate the net work for the cycle, in kJ. (b) Calculate the heat transfer for process 1-2, in kJ. Part A Your answer is correct. Calculate the net work for the cycle, in kJ. Wcycle = -7.63 kJarrow_forwardThe change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is -5084.3 kJ . If the change in enthalpy is -5074.0 kJ , how much work is done during the combustion? Express the work in kilojoules to three significant figures.arrow_forwardConsider a 400-MW, 32 percent efficient coal-fired power plant that uses cooling water withdrawn from a nearby river (with an upstream flow of 10-m3/s and temperature 20 °C) to take care of waste heat. The heat content of the coal is 8,000 Btu/lb, the carbon content is 60% by mass, and the sulfur content is 2% by mass. How much electricity (in kWh/yr) would the plant produce each year? How many pounds per hour of coal would need to be burned at the plant? Estimate the annual carbon emissions from the plant (in metric tons C/year). If the cooling water is only allowed to rise in temperature by 10 °C, what flow rate (in m3/s) from the stream would be required? What would be the river temperature if all the waste heat was transferred to the river water assuming no heat losses during transfer? Estimate the hourly SO2 emissions (in kg/h) from the plant assuming that all the sulfur is oxidized to SO2 during combustion.arrow_forward
- Cellulose is to be burned in a waste to energy facility. The chemical equation for cellulose is C6H10O5. The atomic weights of C, H, and O are 12, 1, and 16, respectively. The ideal equation for the combustion of cellulose is C6H10O5 +6O2à6CO2 + 5H2O. Calculate the stoichiometric oxygen necessary for the combustion of cellulose. Calculate the stoichiometric air supply. The air is 23.15% oxygen by weight. If the facility operates at 1.5 tons/hour at 100% excess air. How much air is required?arrow_forwardThe Bunsen burner in your labs are fueled by natural gas, which is mostly methane, CH4. The thermochemical equations for the combustion of methane (burning in oxygen) is: CH4(g) + 2 O2(g) ➔ CO2(g) + 2 H2O (g) ΔH = – 890.3 kJ/mole Calculate ΔH in kJ when 5.00 g CH4 react with an excess oxygen.arrow_forwardThe enthalpy of combustion of benzoic acid (C6 H5 COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be −3226.7 kJ/mol. When 1.9862 g of benzoic acid are burned in a calorimeter, the temperature rises from 21.84°C to 25.67°C. What is the heat capacity of the bomb? (Assume that the quantity of water surrounding the bomb is exactly 2000 g.)arrow_forward
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