What are the 2 main pollutants that cause global warming?

by ·

What are the 2 main pollutants that cause global warming?

A: Global warming occurs when carbon dioxide (CO2) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface.

What is the main contributor to global warming?

Indeed, carbon dioxide, a byproduct of fossil fuel combustion, is the principal greenhouse gas contributing to global warming. However, other greenhouse gases including methane, nitrous oxide, and a number of industrial-process gases also are important contributors to climate change.

What can be used instead of CFC?

CFC Replacements

  • Substitutes for CFCs in electronics: carbon dioxide.
  • Substitutes for CFCs foam-blowing: water, carbon dioxide, hydrocarbons, HCFCs.
  • Substitutes for CFCs in refrigeration and air-conditioning: HCFCs initially, hydrofluorocarbons (HFCs), hydrocarbons, and ammonia.

What is not a natural refrigerant?

As with carbon dioxide, pressure and efficiency considerations are important criteria for selection. Liquid nitrogen in direct contact freezing is not considered to be a natural refrigerant because the embedded energy required for the production and transport of the liquid is so high.

Can R22 be replaced with R134a?

Using R134a in Systems Designed for R22 If you have a home or auto air conditioner designed to work with R22 refrigerant, and the system needs a recharge, a number of issues prevent the direct substitution of R134a. R134a has a lower thermal conductivity than R22, so an R134a system needs a larger heat exchanger.

What happens if you put R22 in a 134a system?

If you add R-134a to an R-22 system, you will blow the compressor. R-134a works up to 450 psi (typical hot gas condensing pressure). R-22 systems are typically about 300 psi maximum. If you add R-22 to an R-134a system, you will not get close to the rated cooling capacity of the A/C system.

Can I replace R22 with R410a?

R-22 refrigerant is skyrocketing in price due to government mandated reductions in production, and it is never going to get cheaper. To retrofit an R-22 system with R-410A system your line set must not be more than 25-50 feet in total distance.

Is it illegal to mix refrigerants?

Refrigerants are chemical mixtures of various substances. Due to the destructive effects of the compositions of refrigerants on the environment, the EPA has banned the use of certain refrigerants altogether. These banned refrigerants were to be replaced with new ones, and mixing refrigerants became totally illegal.

What is the replacement freon for R22?

R-410A

What is the normal operating pressure for 407C?

If this is so always evaporating above zero, 4 or 5 deg celcius, R407c will have a low pressure (suction ) of about 50 psi. and a high pressure ( discharge ) of about 280 psi, which is about 55 deg celcius, cooling cycle. Standing pressure ( system not running ) will depend on surrounding temperature of outdoor unit.

What should the high and low side pressures be?

Actual readings will vary according to ambient temperature. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Pressure that is too much lower or higher shows there is a problem. On a properly working system, high-side pressure will be about twice the ambient temperature, plus 50 PSI.

Do you charge 407C as a liquid or vapor?

Once liquid is removed from the cylinder, the refrigerant can be charged to the system as liquid or vapor as required. Use the manifold gauge set or a throttling valve to flash the liquid to vapor if needed. The refrigerant system will typically require less weight of Freon™ 407C than R-22.

What should 407C superheat be?

The Pressure/Temperature (P/T) chart shows that the saturated vapor temperature, at the dew point, of R-407C for 79 psig is = 51°F. If the actual refrigerant temperature is 60°F the superheat is 9°F. From the R-407C chart, 250 psig is = 108°F saturated liquid temperature.

What does high superheat indicate?

Excessive or high superheat is an indication of insufficient refrigerant in the evaporator coil for the heat load present. This could mean that not enough refrigerant is entering the coil or this could also indicate an excessive amount of heat load on the evaporator coil.

Can you mix R 22 and R-407C?

Mixing R22 with R407C or any other refrigerant. According to the 609 EPA rule, mixing refrigerants is illegal and anybody caught doing so will be heavily fined. If your system is running on R22 most likely is using mineral oil to lubricate the compressor.

Does 407C require oil change?

R-407C requires minimum of 15% POE oil. 7.

Does R22 use mineral oil?

Refrigerant R-22 has been successfully used with mineral oil in residential air-conditioning and heat pump systems (AC/HP).

What is the difference between R407A and R407C?

Also, R407C exhibits a lower power consumption than that of the R22 tests by a value ranging between (3%) and (4%). On the contrary, R407A shows a higher power consumption than that of R22 by a value ranging between (4%) and (10%).

IS 407C better than 410A?

R-410A is very popular for several HVAC applications, like condensers. However, at high ambient temperatures, R-410A’s operating pressure is much higher than R-407C, leading some to consider other options for such applications.

Can I replace R22 with 407A?

R-407A can also be used as an R22 retrofit for medium and low temperature refrigeration systems but is not intended for air-conditioning applications nor recommended for use in systems with flooded evaporators. A wise option in time of crisis is keeping the existing plant and replacing R22 with a HFC refrigerant.