Refrigerant Recovery system (3)

Final Part of Refrigerant Recovery System

1. Umrer College Of Engineering P roject Progress seminar 3 On Refrigerant Recovery Unit Department of Mechanical Engineering

2. Refrigerant Recovery Unit Seminar submitted by : Khan Azaz Mohd Nasir Suraj Shende Amol Kalekar Sagar Singh Chauhan Shahnawaz Phansopkar Guided by Prof. B.T Dhekwar ( Final year sec. “B” Mechanical Dept.)

3. Introduction We introduce a new series of professional recovery system. The recovery system are compact, lightweight and work with all refrigerants . They are ideal for commercial, residential or industrial appliance applications . As we know our refrigerant system work refrigeration cycle which contains refrigerant and that refrigerant contains harmful chemicals like chlorofluorocarbons (CFCs ). And if our system gets breakdown we usually gives it to mechanic who releases the refrigerant in atmosphere which is very harmful to human being as well as for atmospheric conditions i.e : Ozone layer depletion . So our aim is to recover that refrigerant filter it and reuse it again and again with help of REFRIGERANT RECOVERY UNIT with no loss as we are saving our environment.

4. Making a Recovery Machine • Components required Compressor Condenser Fan motor Fan blade Copper tubes Filter drier Gauges Acrylic sheets Plywood Hinges Nuts and bolts

5. Recovery Machine Block Diagram Condenser Receiver Manifold Compressor Compressor Evaporator Condenser Receiver Manifold Compressor

6. Whether you’re working on a supermarket application with multiple compressors connected in parallel, or on an average-sized residential a/c system, the more you know about what it is you’ll be working on beforehand, the better prepared you’ll be for the job. Before getting started, first identify the refrigerant type and quantity in the system you are servicing. When recovering refrigerant from a system that has a burned-out compressor, you’ll need to use extra filtration prior to recovery to deal with any potential contamination in the oil. However, if you know the gas in the system is relatively clean or new, you should use a new tank. This will make it easier if you plan to put the refrigerant back into the same system. It is recommended that you own at least one tank for each refrigerant type you service, plus extra tanks for burnouts and other unknowns. Knowing the quantity of refrigerant is important for planning storage requirements, as well as planning for the actual recovery. A substantial amount of vapor can remain in the system after all the liquid is removed. UNDERSTAND THE SYSTEM

7. HOSES AND VALVES Hoses and Schrader valves have a large impact on recovery speed. In general, the larger the hose, the less friction on the flow of refrigerant, and the quicker the recovery time. Many contractors and technicians are now using 3/8-inch lines for the input to the recovery machine, even if those lines originate out of 1/4-inch fittings.   Valves: We are using two valves for suction and delivery. Another thing to remember is to use the shortest hose possible. The longer the suction hose and the smaller in diameter it is, the higher the pressure drop in the system and the longer it will take to recover the refrigerant. Make the recovery machine’s job easier by using larger hoses with no restrictions. You will be rewarded with faster recovery rates and lower hours on your recovery unit.

8. KEEP THE DIRT OUT During the recovery process, your recovery machine can be exposed to debris that can cause damage internally. This includes brazing spatter, copper/brass slivers, and acid contamination that may be in the system . Filter-driers are a key component in any refrigeration or air conditioning system.  A filter-drier in a refrigeration or air conditioning system has two essential functions: one, to adsorb system contaminants, such as water, which can create acids, and two, to provide physical filtration. Evaluation of each factor is necessary to ensure proper and economical drier design. To prolong the life of your machine, always use an inline filter at the inlet port. All manufacturers recommend using a new filter on every recovery job. If you follow this simple practice and use the appropriate filter on every job, your refrigerant recovery unit should give you many years of trouble-free performance.

9. GETTING THE REFRIGERANT OUT The key to a quick recovery procedure is to get the liquid out first, then get the remaining vapor out. There are three different ways to remove refrigerant from the system: push-pull recovery; liquid recovery; and vapor recovery (the most common ). Before getting started using the push-pull recovery method, make sure the system doesn’t have a reversing valve that will not allow a solid column of liquid to form, and that it doesn’t have an accumulator. If either of these components exists within the system, the push-pull method cannot be used. You will need to use the liquid or vapor recovery method. • Liquid recovery: With the advent of oil-less compressors and constant-pressure regulator valves, liquid recovery has become the preferred method, recommended by most recovery equipment manufacturers. Liquid recovery is performed the same way as standard vapor recovery. The only difference is that you connect to the high side of the system. Recovering liquid is ideal for recovering large amounts of refrigerant, such as when you transfer refrigerant, or if the system you are servicing allows you to recover liquid. After completing the transfer of liquid refrigerant between a recovery unit and a refrigeration system, avoid trapping liquid refrigerant between the service valves .

10. RECOVERING REFRIGERANT Before using a recovery unit, always: • Check the service valve positions. • Purge and recover any remaining refrigerant from the unit. • Evacuate an empty recovery cylinder before transferring refrigerant to the cylinder. Many technicians prefer to have a digital refrigerant scale for keeping track of the refrigerant when recovering refrigerant. Recovering large amounts of liquid refrigerant can sometimes involve large amounts of oil if the system lacks an adequate oil separator. If this recovered refrigerant is not going to be liquid-charged back into the same system, you might want to separate the refrigerant from the oil to measure the oil. That way, you’ll know how much oil to charge back into the system. When working on a system that has parallel compressors, remember to isolate the parallel compressor system in order to recover refrigerant. Failure to do so will cause an open equalization connection that prevents refrigerant recovery. There is no magic here - you are simply using your recovery machine to make a refrigerator where the tank is the evaporator. Five to 10 minutes of chilling produces some very dramatic tank cooling, depending on conditions. The greater the quantity of refrigerant in the tank, the longer the process will take.

11. FINISHING THE JOB After the refrigerant has been removed, and before the system is ready to receive the new refrigerant, use a vacuum pump to remove moisture and air from the system. Most systems are not “recovery friendly.” Many lack access ports at their lowest points. Since most systems lack such ports, you need to be prepared to boil off the trapped liquid with a heat gun. If you are using your recovery equipment to recover multiple refrigerants, remember to purge the recovery equipment . Safety is always a concern when recovering refrigerant. Always wear safety glasses and gloves to keep debris from getting into your eyes and prevent frostbite on your hands. If you understand the system you’re working on and adequately prepare by using the right tools for the job, the recovery process will go much faster and problem free.

12. Technical details

13. Body components Acrylic sheets Plywood Hinges Nuts and bolts

14. Compressor, Condenser, Fan motor

15. Acrylic sheet Acrylic sheet is a material with unique physical properties and performance characteristics. It weighs half as much as the finest optical glass, yet is equal to it in clarity and its up to 17 times more impact resistance features qty. required 1 thickness 0.30 inch

16. Technical details Components Technical Specification refrigerants Recovers commonly used CFCs HCFCs or HFCs including blends such as R134A and R22A weight Approx (28 kg) dimensions Approx (1.9 inch. L* 1.8 inch. W * 1.1 inch. H) Gauge ranges Low pressure hg vac-0-120 psig High pressure 0-500 psig compressor 230V, single phase, 50 hz power 130 VAC, 60 hz, 10 amps Fan motor 230v, 50 hz, single phase 40 amp, 1360 rpm, 1/83 HP Aw Refrigerator or air conditioner 230V, single phase, 50 Hz

17. References The deadline for mandatory recovery of R-134a was November 15,1995. After that date, became illegal. Recycling of R-134a, using EPA-approved equipment, became mandatory on January 29,1998 Timothy A. Zilke President, ASE(AUTOMOTIVE SERVICE EXCELLENCE) The introduction of new refrigerants in 1930 was the beginning of use of Chlorofluorocarbon (CFC) and hydro chlorofluorocarbon (HCFC) ( Granryd E et al., 2003). Though these refrigerants were safe, CFCs were found to deplete the ozone layer and have high global warming potential . Jigme Nidup Stockholm , 2009

18. Thanking note, Prof. B.T Dhekwar …..We will give our level best