A 2,000-MW (el) power plant working at 30% thermal efficiency 100% of the time (base load) uses coal (with formula CH) and a heating value of 25 MJ/kg. Determine the rate of the mass of coal burned, M (tons/yr). How much CO2 does this plant emit (metric tons/y)? Theoretically, 1 g of coal produce 3.38 g of CO2

A 2,000-MW (el) power plant working at 30% thermal efficiency 100% of the time (base load) uses coal (with formula CH) and a heating value of 25 MJ/kg. Determine the rate of the mass of coal burned, M (tons/yr). How much CO2 does this plant emit (metric tons/y)? Theoretically, 1 g of coal produce 3.38 g of CO2

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 27RQ: How many Btu/h would be produced in a 12-kW electricheater?

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You work as a maintenance engineer at Al-Hussein Thermal Power Station that produces electricity. It has a total generation capacity of 260 MW, which consists of two steam power plant units (2 x 130 MW). A. If the thermal efficiency of the first unit is 70%, and that of the second unit is 65%, determine the rate of the thermal energy required to operate the station. B. Determine the rate of waste heat rejection from the station. C. Determine the amount of waste heat energy rejected from the station if it has been operated for 12 hours. D. After certain maintenance operations, the efficiency of each unit is improved to become 80%: 1) How does this improvement affect the rate of thermal energy required to produce the same electrical power 260MW? Compare your answer with that obtained from part A 2) Calculate the rate of waste heat rejection after the improvement? Compare this value with that that obtained from part B. 3) Depending on your results in parts 1 and 2. How do you expect this…
What is the Conservation of Energy?
2. Calculate the annual (365 days) fuel consumption (kg) of the person who owns a car. The maximum output of a car is 100kW, the efficiency of the car is 25%, the average load rate is 20%, the average usage time per day is 2 hours, and the calorific value of the fuel is 10kcal/g. (1cal = 4.2J)
In the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .