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GWP, ODP and Atmospheric Lifetime of refrigerants

GWP, ODP and Atmospheric Lifetime of Refrigerants

Refrigerants

HVAC, Refrigerators and air conditioners are commonly used in numerous cities, households and automobiles. Refrigerators and air conditioners account for a large proportion of home appliance sales. The number of refrigerators and air conditioners in the world is a huge number. The reason why refrigerators and air conditioners can cool is because of the core key component, the compressor. The compressor uses refrigerant to transport heat energy during operation. The refrigerants have many types. Some conventional refrigerants used since long are damaging ozone layer friendly and impacting global warming. So, governments and organizations are regulating the uses of different refrigerants.

 

Montreal Protocol

Montreal Protocol is a global agreement to protect the Earth's ozone layer by phasing out the chemicals that deplete it. In 2007, The famous Decision XIX/6, taken in 2007, to adjust the Protocol to accelerate the phase out of Hydrochlorofluorocarbons or HCFCs. Current discussions on the Montreal Protocol potentially being amended to facilitate the phasedown of hydrofluorocarbons or HFCs.

 ODP,Ozone Depletion Potential from montreal protocol

GWP

Global Warming Potential, or GWP, is a measure of how destructive a climate pollutant is. The GWP of a gas refers to the total contribution to global warming resulting from the emission of one unit of that gas relative to one unit of the reference gas, CO2, which is assigned a value of 1. GWPs can also be used to define the impact greenhouse gases will have on global warming over different time periods or time horizons. These are usually 20 years, 100 years, and 500 years. A time horizon of 100 years is used by regulators. Here we use the time horizon of 100 years in the following chart.

 

ODP

Ozone Depletion Potential, or ODP, is a measure of how much damage a chemical can cause to the ozone layer compared with a similar mass of trichlorofluoromethane (CFC-11). CFC-11, with an ozone depleting potential of 1.0, is used as the base figure for measuring ozone depleting potential.

 

Atmospheric Lifetime

The atmospheric lifetime of a species measures the time required to restore equilibrium in the atmosphere following a sudden increase or decrease in concentration of the species in question in the atmosphere.

 

Here is a chart to show different refrigerants’ GWP, ODP and Atmospheric Lifetime.

Type

Refrigerant

ODP

GWP (100yr)

Atmospheric lifetime

HCFC

R22

0.034

1,700

12

CFC

R11

0.820

4,600

45

CFC

R12

0.820

10,600

100

CFC

R13

1

13900

640

CFC

R14

0

7390

50000

CFC

R500

0.738

8077

74.17

CFC

R502

0.25

4657

876

HFC

R23

0

12,500

270

HFC

R32

0

704

4.9

HFC

R123

0.012

120

1.3

HFC

R125

0

3450

29

HFC

R134a

0

1360

14

HFC

R143a

12

5080

52

HFC

R152a

0

148

1.4

HFC

R404a

0

3,800

50

HFC

R407C

0

1674

29

HFC

R410a

0

2,000

29

HC

R290 (Propane)

Natural

~20

13 days

HC

R50

<0

28

12

HC

R170

<0

8

58 days

HC

R600

0

5

6.8 days

HC

R600a

0

3

12 ± 3

HC

R601

0

4

12 ± 3

HC

R601a

0

4

12 ± 3

HC

R610

<0

4

12 ± 3

HC

R611

0

<25

12 ± 3

HC

R1150

<0

3.7

12

HC

R1270

<0

1.8

12

NH3

R-717

0

0

0

CO2

R-744

0

1

29,300-36,100

 

 The difference between HC refrigerants and freon refrigerant

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Post time: Jan-11-2023          Views: