|
| |
OIL SEPERATORS - R134A / R404A / R507A /R407 / R22 |
| |
APPLICATION |
 |
|
| |
 The Cooling World oil seperators are impingement screen type oil seperators. They work by having the compressed mass flow enter into a larger seperator chamber, which lowers the velocity. The atomized oil droplets collect on the impingement screen surface. As the oil droplets agglomerate, they fall to the bottom of the seperator oil reservoir. The 600 series is designed for OEM applications where accessibilty of the 500 series is not required.
They are designed for installation on commercial refrigerating systems and on civil and industrial conditioning plants, which use refrigerant fluids.
The advantage of the oil seperator on the discharge line of a compressor in a refrigeration system are confirmed by many years of experience. The oil seperator intercepts the oil mixed with compressed gas and returns it to the crankcase of the compressor thus assuring an efficient lubrication of its moving parts. Furthermore the oil seperator maiuntains a high coefficient of condenser and evaporator performance by almost completely removing oil deposits from their exchange surfaces & limit accumulates of oil at Sensitive System Components. When a very high temperature at the end of the compression stage leads to the formation of oil vapours, a seperator with a capacity (*exceeding the values shown in the table) should be used. Moreover, the oil seperator with a capacitty (*exceeding the values shown in the table) should be used. Moreover, the oil seperator, damping the valves pulsations , reduces system noise with an open or semi-hermetic compressor.
Finally, the use of an oil seperator leads to:
a longer life of the compressor (ensure positive oil return);
a better performance of the whole system with consequent energy saving;
A quiter operation by reducing pulsations.
* Table 1 & 2 showthe technical data relating to the working conditions of oil seperators.
|
| |
|
| |
CONSTRUCTION |
|
|
| |
Cooling World manufacturers two type of oil seperators:
Seperators series 500 can be overhauled for maintenance and can be replaced from the system.
Seperators series 600 are closed type and they can not be dismantled from the system, except cutting the piping.
The body is manufactured from stainless steel pipe of adequate thickness. Flanges and cover are also made of steel.
The internal device is simple in order to assure a trouble –free long operation.Appropriate stainless steel metallic screens, placed on the inlet & outlet, rapidly reduce gas speed, and create the conditions required for the seperation of the oil from the refrigerant. A float operated needle valve, set on the bottom of the vessel, return the oil to the crankcaseof compressor . The bottom also includes a chamber that collects all metallic debris. A permanent magnet holds these impurities to avoid they stop or damage the operation of needle, moved by floating. |
| |
|
| |
INSTALLATION |
|
|
| |
The oil separator type 500 and 600 should be installed in the discharge line between the compressor and the condenser mounted securely in a vertical position as close to the compressor.
To prevent the return of refrigerant from condenser, during the off cycle of the system, it’s advisable to install a check valve between the condenser and oil separator outlet connection.
Oil seperator performs best when operating at or near the compressor discharge temperature. In location the oil separator, choose a position to avoid, as far as possible, chilling of the shell, which may result in condensing of liquid within the separator. If this is not possible, it is advisable to supply the separator with the better solutions (insulation, strap heater, others) to prevent the refrigerant in the system from the condensing in the shell (specially in low temperature application).Before the oil separator is installed, either 500 or 600, an initial charge of oil should be added to it. Refer to general characteristics of oil seperators or to instruction sheet for the proper amount of oil. Oil pre-charge is very important, failure to pre-charge separator sump may result in damage to the oil return float mechanism. Use the same type of oil that is in the compressor crankcase.
Acting as the layout of refrigerating system,the return line may be run from the oil fitting to:
• The compressor crankcase;
• The suction line upstream the compressor or upstream the receiver, if present;
• The suction line upstream the compressor or upstream the receiver, if present;
• The oil reservoir if oil control systemis being used.
A sight glass may be installed in the oil line, in a position that oil is flowing through the tube, to check the correct working of the oil separator. |
| |
|
| |
ACCUMULATORS - WITH OR WITHOUT HEAT EXCHANGER |
| |
APPLICATIONS |
|
|
| |
 Suction line accumulators are installed on refrigeration systems to prevent refrigerant liquid return to suction line to idled compressors.
These systems include the following:
Systems with high temperature differences (discontinuos operation),
Remote systems with long lines,
Systems with low evaporator load,
Reversing cycle systems: heat pump and defrost applications.
Recommended for low superheat applications such as liquid chillers, low temperatures display cases, truck units, and so on….
|
| |
|
| |
CHARACTERISTICS |
|
|
| |
Complete seperation of the vapour phase and the refrigerant fluid’s liquid phase.
Complete vapourization of the refrigerant liquid when the liquid leaves the Accumulators.
Cooling of the vapour returning to compressor, thus reducing motor warm up.
Pressure equlization at the Accumulators inlet and outlet, even in off cycle periods.
Minimum pressure drop.
Reduced noise on the low pressureside of the system.
Positive oil return.
Maximum efficiency of the relief device (expansion valve) because it is supplied with subcooled liquid.
Enhanced evaporator performance. |
| |
|
| |
RECOMMENDATIONS |
|
|
| |
For optimum operation, the velocity at which the refrigerant liquid passes through the tube baffles of the accumulator should be between 8 and 12 m/s.If the velocity of the gas in the piping is insufficient, oilreturn to thye compressor is not assured.
The selected liquid holding capacity should not be less than 50% of the total charge of refrigerant liquid in the installation.
The pressure drop in the accumulators should not go beyond 0.30 C.
The suction line accumulators must be installed in a vertical position, as close to the compressor as possible and at the same level as compressor.
Mounting always has to be done vertically, as close as possible to the compressor and at the same height.
In order to avoid any frost on suction accumulators, Seabird strongly recommends to systematically insulate Suction Accumulators. |
| |
|
| |
LIQUID RECEIVERS |
| |
CONSTRUCTION FEATURES |
|
|
| |
Suitable for all (H) CFC/HFC – refrigerants.
Maximum Permissible working over pressure: 28 Bar
Maximum permissible operating temperature 1200C.
Holding Gas Charge.
Liquid Level control:
SB062h to SB152H, SBS35, SBS55, SBS75, SBS125:
1 sight glass,
SB202H to SB3102N, SBS102,
SBS152, SBS202: 2 sight glasses, from Type SBS252:
3 sight glasses. |
| |
|
| |
FIXING |
|
|
| |
• SB062H to SB3102N: Lower angle brackets
• SBS35: Central stud below.
• SBS55 to SB3102: Fixing feet.
• Liquid receivers with the suffix H or T: Upper Angle brackets |
| |
|
| |
CONNECTION FOR PRESSURE RELIEF VALVE |
|
|
| |
• From SB062H to SB3102N
• SBS35 to SBS3102 |
| |
|
| |
OPTIONS |
|
|
| |
• Sight Glass
• Pressure Relief Valves |
| |
|
| |
REFRIGERANT INLET CONNECTION |
|
|
| |
• SB35, SB55, SB75, SB125: Brazing connection,gauge Connection.
• SB062H to SB105N and SB102, SB152, to SB902: Screwed pipe connection and solder tail piece.
• SB1202N to SB3102N and SB1122 to SB3102: flange and soiler tail piece. |
| |
|
| |
REFRIGERANT OUTLET CONNECTION |
|
|
| |
• SB062H to SB1602N, SBS35 to SBS1602: Rotalock valve with brazing connection, gauge connection
• SB2202N to SB3102N, SB2202 to SBS3102: Valve with screwed pipe and solder tail piece, Pressure Gauge connection. |
| |
|
| |
|
|
|
|
