A typical car driven 20,000 km a year emits to the atmosphere about 11 kg per year of NO x (nitrogen oxides), which cause smog in major population areas. Natural gas burned in the furnace emits about 4.3 g of NO x per therm (1 therm = 105,500 kJ), and the electric power plants emit about 7.1 g of NO x per kWh of electricity produced. Consider a household that has two cars and consumes 9000 kWh of electricity and 1200 therms of natural gas per year. Determine the amount of NO x emission to the atmosphere per year for which this household is responsible. FIGURE P2–83
A typical car driven 20,000 km a year emits to the atmosphere about 11 kg per year of NO x (nitrogen oxides), which cause smog in major population areas. Natural gas burned in the furnace emits about 4.3 g of NO x per therm (1 therm = 105,500 kJ), and the electric power plants emit about 7.1 g of NO x per kWh of electricity produced. Consider a household that has two cars and consumes 9000 kWh of electricity and 1200 therms of natural gas per year. Determine the amount of NO x emission to the atmosphere per year for which this household is responsible. FIGURE P2–83
Solution Summary: The author calculates the amount of NO_Textx produced by substituting 2 cars for no. of cars.
A typical car driven 20,000 km a year emits to the atmosphere about 11 kg per year of NOx (nitrogen oxides), which cause smog in major population areas. Natural gas burned in the furnace emits about 4.3 g of NOx per therm (1 therm = 105,500 kJ), and the electric power plants emit about 7.1 g of NOx per kWh of electricity produced. Consider a household that has two cars and consumes 9000 kWh of electricity and 1200 therms of natural gas per year. Determine the amount of NOx emission to the atmosphere per year for which this household is responsible.
How many kg of CO2 will be saved by reducing the power usage of the total petrol vehicle fleet by 10 GWh/day for one year? Note that a petrol car typically produces 2.31 kg/L of CO2, and the energy density of petrol is 34 MJ/L.
An electric boiler generates 100,000 Btus of heat. Roughly, what is the electrical input of the boiler (in other words, the electrical energy to produce the output), in kilo-watts?
When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form CO2 (carbon dioxide). On average, 0.59 kg of CO2 is produced for each kWh of electricity generated from a power plant that burns natural gas. A typical new household refrigerator uses about 700 kWh of electricity per year. A city's refrigerators produce 20,650 mton CO2/year (50,000 households in the city).
If the area of the city is 190 miles2, and if all that CO2 accumulates in the atmosphere, calculate the increase in CO2 concentration by weight in the atmosphere knowing that each cm2 of area carries a column of air that weighs 1 kg. If 1 mature tree absorbs 48 lbm of CO2 per year, what is the ratio of trees to households this city should have to counter the effect of refrigeration?
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