Final Part of Refrigerant Recovery System

1. Umrer College Of Engineering
Project 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
ReceiverManif
old
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