Question

1) A coal fired power plant produces 1.00x10^14 J per day by burning coal. If the efficiency is 40.0%, how much work does the turbines do? 2) How much energy is lost to the environment (as heat)? 3) If 1 kg of coal can produce 2.5x10^6 J, and 1 kg of coal produces 3.67 kg of CO2, how much CO2 is produced in a year from this plant? 4) If there are 1000 such power plants worldwide, how long will it take these plants to double the amount of CO2 in the atmosphere? You may want to ask Google about how much CO2 there is in the atmosphere.

Answer #1

**1) Qin = 1.00*10^14 J**

**e = 40%
= 0.40**

**now use, e = W/Qin**

**==> W = Qin*e**

**= 1.00*10^14*0.4**

**= 4.00*10^13 J
<<<<<<<<<--------------------Answer**

**2) Energy lost to the environment,**

**Q_out = Qin - W**

**= 1.00*10^14 - 4.00*10^13**

**= 6.00*10^13 J
<<<<<<<<<--------------------Answer**

**3) the mass of the coal used in one day =
1*10^14/(2.5*10^6)**

**= 4.00*10^7 kg**

**mass of the coal used in one year =
365*4*10^7**

**= 1.46*10^10 kg**

**CO2 produced in one year = 1.46*10^10*3.67**

**= 5.36*10^10 kg
<<<<<<<<<--------------------Answer**

**4) total present mass of CO2 = 2.996*10^15
kg**

**time taken to double CO2 =
2.996*10^15/(1000*5.36*10^10)**

**= 55.9 years
<<<<<<<<<--------------------Answer**

Part A A coal-fired plant generates 600 MW of electric power.
The plant uses 4.8 × 106 kg of coal each day. The heat produced by
the combustion of coal is 3.3 × 107 J/kg. The steam that drives the
turbines is at a temperature of 300°C, and the exhaust water is at
37°C.
Part A
(a) What is the overall efficiency of the plant for generating
electric power?
Part B
(b) What is the maximum efficiency that this plant...

A coal-fired power plant operates at an efficiency of 38%. If
the facility produces 6TWh of electricity per year, what is the
rate of coal consumption in kg/s. Approximate coal as pure
carbon.

A coal-burning power plant that uses an evaporating water tower
to cool the generated steam has the following characteristics: uses
about 2,000 metric tons/day of bituminous coal, has an overall
efficiency of 35% in converting the energy from the combustion of
coal to electricity, and 10% of the heat energy produced is lost to
the surrounding environment as hot air through the chimney of the
plant (stack). Determine how much water is required to run the
plant, i.e., to cool...

A local coal fired 200 megawatt electrical generating plant has
a thermal efficiency of 30% and a nuclear 150 megawatt electrical
generating plant has a thermal efficiency of 25%.
a. Calculate the waste heat emitted by each (in megawatts)
b. If the cooling water used for the nuclear plant were required
to only rise in temperature by 2o C after it absorbs the waste
heat, how much water per hour would be required to cool the nuclear
plant (in cubic...

A coal-fired power plant can produce electricity at an operating
cost of $0.06 per kilowatt-hour when running at its full capacity
of 30 megawatts per hour, $0.16 per kilowatt-hour when running at
20 megawatts per hour, and $0.24 per kilowatt-hour when running at
10 megawatts per hour. A gas-fired power plant can produce
electricity at a variable cost of $0.12 per kilowatt-hour at any
capacity from 1 megawatt per hour to its full capacity of 5
megawatts per hour. The...

20. [1pt]
A coal-fired power plant burns 2000.0 tons of coal a day.
Assume that 95% of the weight of the coal is carbon that is
combusted into CO
2. How many tons of CO2 does this plant
release every day?
A) 7,000
B) 950
C) This is the only guaranteed wrong answer - do not enter it - you
will be locked out of this problem
D) 14,000
E) 3,500
F) 10,500

A typical coal-fired power plant generates 1000 MW of usable
power at an overall thermal efficiency of 40%.
PART A:
What is the rate of heat input to the plant? Answer in MW
PART B:
The plant burns anthracite coal, which has a heat of combustion
of 2.65×107J/kg. How much coal does the plant use per day, if it
operates continuously? Answer in kg
PART C:
At what rate is heat ejected into the cool reservoir, which is
the nearby...

Calculate the emissions reductions if a coal-fired power plant
is converted to wood pellets. The biomass burned by the power plant
is fully regrown but 19% of the harvest is consumed during
processing of the biomass. Furthermore, the transportation of wood
and wood pellets from source to power plant requries 273 litres of
diesel per ton of wood pellet delivered. Treat the diesel as pure
cetane and the wood pellets are pure carbohydrate chains.
Fuel Properties
-Calorific value of coal:...

A power plant burns 900kg of coal per hour and produces 480kw of
power.if each kg of coal releases 5,9MJ, determine the efficiency
of the plant
b)air enters the nozzles at 3,0 bar, 1270C and
30m/s.During its passages a heat loss of 4,40kj/kg and the fluid
leaves at 2,0 bar and 270m/s.the heat loss to environment ioccurs
at 270c. calculate the final temperature,the entropy
change of air and the total entropy change of the overall process,
is the process reversible,irrevessible...

A coal-fired power plant (PP) has a rated power of 1000 MWe. It
works at 100% capacity (base-loaded) at a thermal efficiency of
35%. It burns coal having a heating value of 30 MJ/kg and a sulfur
content of 2% by weight, a nitrogen content of 1% by weight, and a
mineral (ash) content of 10% by weight. b) How much coal does the
PP consume per year (ton/yr) ? 3*106 tons/yr c) How much SO2 does
the PP emit...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 27 minutes ago

asked 29 minutes ago

asked 35 minutes ago

asked 44 minutes ago

asked 52 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago