Written Refrigerants  make air conditioning possible. Contained within the coils of an air conditioner, these liquid agents cool and dehumidify indoor air. For years, the most common refrigerant gas used in air-conditioning systems was R-22 (Freon).Today, Services for Major Brand's Air Conditioner should be provided considering growing environmental concerns. Production of systems using R-22 refrigerant is being dropped out. Meanwhile, cooling systems have introduced an environment friendly alternative to R-22.Today , EPA-recognized chlorine-free R-410A refrigerant is acclaimed in the industry. Because R-410A contains no chlorine, it is considered ozone-friendly.Highest efficiency cooling systems are designed to use R-410 A refrigerant, therefore providing an economic benefit in addition to the environmental benefit.  R-410A systems are also known for improved reliability, quieter operation, improved dehumidification and enhanced heat pump performance.Main Features of R-410A are :R-410 A is a hydro-flurocarbon ( HFC ) & doesn't contribute to ozone depletion.its operating pressures are 50% higher than R - 22R-410 A systems require components capable of working at these high pressuresR-410 A is the most common refrigerant for new light commercial unitary air conditioning systems.

Written The gas used is Freon, which is merely a marketed name for  dichlorodifluoromethane (A CFC [chloro fluoro carbon]). This is a  product that is being phased out because it adds to ozone depletion and  thus the Global Warming effect. This happens because when the CFC's  escape from the unit it quickly rises up to the ozone layer. Once there  it rips the ozone (three oxygen molecules bonded together) apart and  turns them into plain oxygen (two oxygen molecules bonded together).high quality ac unitsThe problem with this is that ozone is very reflective of the radiation  from the sun and it works to keep the surface of the planet from  becoming too warm.how much for a new furnace and ac unitWorth noting is that a single CFC molecule could potentially destroy hundreds of thousands of ozone molecules in it's life span.how to clean air conditioner unit outside

Anyway it works because the freon is compressed (at the base of the  fridge/air con unit), causing it to heat up, it is then run through a  series of coils so it condenses as a liquid, it is run through an  expansion valve where it becomes a very cold gas which is run up behind  the fridge or past the fan of the airconditioning unit.There are some alternatives in use that are less damaging to such a precious resource but freon is still the most popular.Written The commonly used refrigerant gas is R22 Chlorodifluoromethane).  However, After the Montreal Protocol the gas R22 is to be phased out due to its ozone depleting properties. R22 will phased out from the developed countries by 2020 and in developing countries by 2030.You can refer to the presentation showing the phase out schedule and alternatives by referring this Page on jandgassociates.co.uk The performance of R22 in ACs and Refrigerators was excellent compared to all other gases. Currently different firms across the world are looking to come up with an alternative to R22.

Some of the other refrigerant gases which are considered as an alternative for R22 are R404,HF134a,..However these gases are not effective as R22 and also they require minor structural modification of the existing air conditioning systems due to the pressure range in which they operate.For the second part of your question. Generally they don't add any chemicals to improve the efficiency. The gases are measured based on the COP(Coefficient of Performance) they give for the air conditioning system. Other than this the operating pressure of the refrigerant, its ability to undergo phase change ( change from one physical state to another), environmental impact..etc. are also taken into account.Written Hmm, Don't ask for me, my work or employer.R22 and CFC are gone now, R134 is still used in old AC's which have not changed refrigerants. Now a days my employer uses R600a, isobutane because of- Low vapor pressure--> low condenser duty, low pumping power and the thickness of evaporator and condenser can be reduced too to improve heat transfer and cut down some cost.

High energy efficiency --> They might not have told you in school or college but the efficiency of refrigeration or air conditioning strongly depends on the refrigerant they use. Currently R600 n-butane is the most efficient then R600a is there. New refrigerants R500 or R504 I don't remember exactly but they are in research phase and might replace R600a and R134 in race of efficiency. It won't be 5 years more for butane I guess. It will be replaced soon.Yes nano particles have you heard about them. Its like adding copper in fluid to improve heat transfer characteristics then there is MNF- magnetic nano fluids which further enhances the heat transfer in magnetic nano fluid by applying magnetic field in direction of heat transfer.For further research--> Do some literature survey on refrigeration and air conditioning. And please do listen to the lectures carefully if you are a student. QUESTION: My old central air conditioner still works, but I wonder if I should replace it with a super-efficient one.

How much can I expect to save on my electric bills? Are the new natural gas cooling units efficient?ANSWER: Your old air conditioner probably has a SEER (efficiency ratio) of about 6 or 7. A new super-efficient electric unit has a SEER of 15. Installing one can cut your cooling costs by more than 50%. New natural gas central air conditioning units have an equivalent SEER as high as 27.New super-efficient electric air conditioning units use two-speed compressors and variable-speed indoor blowers. On the low energy saving speed (runs at high speed only on the hottest days), each cycle run time is longer. Indoor temperature swings between on-off cycles are virtually eliminated.The air gently circulates almost continuously and noise is reduced. With soft start, the initial burst of warm (cold in the winter) air from the ducts is eliminated. This is ideal for allergy sufferers because air cleaners are more effective and humidity levels, mold, mites, etc. are reduced.The indoor blowers use special electrically commutated motors.

These not only provide true variable-speed operation for better comfort, but they use less than half as much electricity as standard blower motors.The most efficient single-speed air conditioning units use scroll compressors. Scroll compressors have fewer moving parts than standard reciprocating piston compressors. Without pistons and valves, scroll compressors are quieter too.As scroll compressors wear over years of operation, they seal better and operate smoother than when they were new. Their basic design is reliable, and they should continue to operate at high efficiency levels for many years.If you have natural gas, there are gas-powered air conditioning units that use a no-compressor absorption process. These also heat your house in the winter.Another super-efficient gas central air conditioning and heating unit uses a compressor. With an equivalent SEER of 27, it can cut cooling costs by 75%. It looks just like a standard electric central air conditioning unit outdoors and is quieter.

A small natural gas-powered engine runs the compressor. Since an engine can run at any speed, its microprocessor continually, fine-tunes the cooling output (17 levels) to the precise cooling needs of your house.In the winter, this year-round gas air conditioning unit heats your house at more than 100% efficiency. It combines the heat pump principal with the excess heat from running the engine. This can cut your heating costs by half too.Write for Update Bulletin No. 528 showing a buyer's guide of super-efficient gas and electric central air-conditioning manufacturers listing efficiency, cooling capacity, compressor type and number of speeds, features and a savings-selector chart. Please send $2 and a business-size self addressed, stamped envelope to James Dulley, Los Angeles Times, 6906 Royalgreen Drive, Cincinnati, OH 45244.What Sun Room Design Is Most Efficient?Q: I am planning the addition of a sun room to my house. I will use it for growing some plants and hope to get some free solar heating in the winter from it.