Compare the contribution to global warming in millions of metric tons of carbon

Question

Compare the contribution to global warming in millions of metric tons of carbon dioxide equivalent of the two systems below. Based on your results, which process is environmentally preferred and why? Copyright | CENGAGE Learning | Engineering Applications in Sustainable Design and Development | Edition 1 | dadeco3@yahoo.com | Printed from www.chegg.com

EMISSIONS FROMSYSTEM 1 (kg/year) EMISSIONS FROM SYSTEM 2 GAS Carbon dioxide Methane Nickel Nitrous oxide CE CF g year (kg/year) kg year 5.00E 1 09 3.00E 1 09 0.00E1 00 3.00E 1 09 5.60E 1 08 0.00E 1 00 3.00E 1 09 5.00E 1 09 1.20E 1 14 3.00E 1 09 0.00E 1 00 3.00E 1 09

Explanation / Answer

Calculation of equivalent CO2

Equivalent CO2 is the concentration of CO2 that would cause same global warming impact for the given type and concentration of a green house gas.

Gas

Equivalent CO2 (kg)

System 1 (kg/year)

CO2 from system 1

(kg/year)

Total CO2 from system 1

(kg/year)

System 2

(kg/year)

CO2 from system 2

(kg/year)

Total CO2 from system 2

(kg/year)

Carbon di oxide

1

5x109

1x5x109

5x109

3x109

1x3x109

3x109

Methane

25

3x109

25x3x109

75x109

5x109

25x5x109

125x109

Nickel

11.53

0

11.53x0

0

1.2x1014

11.53x1.2x1014

13.836x1014=

1383600x109

Nitrous Oxide

298

3x109

298x3x109

894x109

3x109

298x3x109

894x109

CF4

7390

5.6x108

7390x5.6x108

41384x108=

4138.4x109

0

73.90x0

0

C2F6

12200

0

12200x0

0

3x109

12200x3x109

36600x109

Total Emissions

5,112.4x109

1,421,222x109

106 is 1 million.

1 Metric Ton = 103 kg

So the system 1 gives out 5112.4 Million metric tonnes of CO2 and system 2 gives out 1,421,222 Million metric tonnes of CO2 every year

From the above total CO2 emission values, it is concluded that system 1 is environmentally friendly.

Gas

Equivalent CO2 (kg)

System 1 (kg/year)

CO2 from system 1

(kg/year)

Total CO2 from system 1

(kg/year)

System 2

(kg/year)

CO2 from system 2

(kg/year)

Total CO2 from system 2

(kg/year)

Carbon di oxide

1

5x109

1x5x109

5x109

3x109

1x3x109

3x109

Methane

25

3x109

25x3x109

75x109

5x109

25x5x109

125x109

Nickel

11.53

0

11.53x0

0

1.2x1014

11.53x1.2x1014

13.836x1014=

1383600x109

Nitrous Oxide

298

3x109

298x3x109

894x109

3x109

298x3x109

894x109

CF4

7390

5.6x108

7390x5.6x108

41384x108=

4138.4x109

0

73.90x0

0

C2F6

12200

0

12200x0

0

3x109

12200x3x109

36600x109

Total Emissions

5,112.4x109

1,421,222x109

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