SUSTAINABLE ENERGY (LL)
2nd Edition
ISBN: 9780357667224
Author: DUNLAP
Publisher: CENGAGE L
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Chapter 3, Problem 13P
(a)
To determine
Calculate the amount of coal burned per second.
(b)
To determine
Calculate the amount of heat released to the environment per second.
(c)
To determine
Calculate the amount of water at
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Which emits more SOx per unit amount of electricity produced; a coal-fired plant with a 90% efficient SO2 scrubber or an oil-fired plant with m scrubber? Assume the coal has a heat content of 13,000 Btu/lb and contains 3.5% sulfur, and that the oil has a heat content of 6.0(10)* Biu/barrel (42 gallons) and contains 0.9% sulfur, Assume the oil has a specific gravity of 0,92.
2 m^3/min of a light oil are to be heated from 20C to 100C (with zero vaporization) in an exchanger using 250 kPa steam of 90% quality. The heat losses to the surrounding air have been estimated to be 5% of the heat transferred from the condensing steam to the oil. If the steam condensate leaves at its saturation point, what mass of steam per hour will be used in the exchanger? For light oil, Specific gravity= 0.88Specific heat= 2.00 kJ/kg-KFor steam at 250 kPa,Saturated liquid: hf= 535.49 kJ/kg vf= 0.001067 m^3/kgSaturated vapor: hg= 2716.8 kJ/kg vg= 0.7188 m^3/kg
Water falls from a height of 500 m and the mass of water is
50 kg. What is approximately the rise in temperature of
water at the bottom if the whole energy is used to heat the
water? Specific heat of water is 4.18 kJ/kg-deg C.
O 5000 deg C
O 1173 deg C
O 500 deg C
O 0.23 deg C
O none of the above
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- Consider a 400-MW, 32 percent efficient coal-fired power plant that uses cooling water withdrawn from a nearby river (with an upstream flow of 10-m3/s and temperature 20 °C) to take care of waste heat.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_forwardA certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.arrow_forwardDerive the CO2emission factor for the coal.arrow_forward
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