Hanbell RC2-AV Series Manual Download

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flow out from the oil outlet connector and flow in to the oil inlet connector. If you don
cooling, you should simply see a cover plate on this position which means the oil will pass this internal tunnel
the plate and up to the cylinder and bearings. Please refer to the

Figure 48 Internal oil circuit application

7.2 Economizer applications

HANBELL  screw  compressor  can  be  fitted  with  an  additional  middle  connection  for  economizer  operation.  With  this
form of operation, refrigeration capacity and also system efficiency can be improved by means of a sub
or  two-stage  refrigerant  expansion.  Based  on  HANBELL  extensive  re
connection has been developed so that the connection causes no additional back flow losses during
result,  compressor  capacity  is  fully  retained
calculation of economizer capacity at different

Principle of operation
As opposed to the reciprocating operation of a piston compressor, the compression in a sc
only with one flow direction. When the rotors turn, refrigerant vapor is pressed into the rotor grooves by the opposing
rotor teeth and transported to end wall of the corresponding working space. In this phase, the volume is stea
reduced and the vapor is compressed from suction p
middle connection is at a similar level to the intermediate pressure with a two
features, a screw compressor of this design can be combined with an additional sub
pressure vessel (flash type sub-cooler) for two
refrigeration capacity due to additional liquid sub
of the compressor increases slightly compare to the additional work that takes place at a better level

System with Economizer (sub-cooler)
With this form of operation, a heat exchanger (refrigerant sub
cooling is achieved by injecting a part of the refrigerant from the condenser through an expansion device in counter
flow into the sub-cooler, which then evaporates due to the absorption of heat. The superheated vapor is pulled into the
compressor at the Economizer connection and mixed with the vapor, which is already slightly compressed from the
evaporator. The sub-cooled liquid is at condensing pressure with this form of operation, the pipeline to the evaporator
does not therefore require any special features, aside from insulation. The system can be generally app
shows the system with economizer, sub-cooler

System with economizer (flash type)
The liquid sub-cooling is achieved with this form of operation by reducing the boiling point pressure in an intermediate
pressure vessel (flash type sub-cooler)
the cooling of the liquid down to the boiling point, due to evaporation of part of the liquid. To stabilize the pressure of
the vessel, a regulator is used which at the same time controls the qu
of the compressor. This form of operation gives the most economical thermodynamic performance due to direct heat
exchanging. As the intermediate pressure is reduced to the boiling point temperature this system should only be used
with flooded evaporators. Figure 52 shows t

Notes:
1. When economizer is used, it is recommende

compression chamber to effectively mitigate

2. A filter and check valve are also recommended to install before ECO port of compressor.

flow out from the oil outlet connector and flow in to the oil inlet connector. If you don

, you should simply see a cover plate on this position which means the oil will pass this internal tunnel

and up to the cylinder and bearings. Please refer to the illustration below.

Internal oil circuit application

Figure 49 External oil circuit application

Based on HANBELL extensive research a special design of the

connection has been developed so that the connection causes no additional back flow losses during

, compressor capacity is fully retained at all operating conditions. Please refer to Hanbell selection s

at different operating conditions.

As opposed to the reciprocating operation of a piston compressor, the compression in a sc
only with one flow direction. When the rotors turn, refrigerant vapor is pressed into the rotor grooves by the opposing
rotor teeth and transported to end wall of the corresponding working space. In this phase, the volume is stea
reduced and the vapor is compressed from suction pressure to condensing pressure. The pressure at the additional
middle connection is at a similar level to the intermediate pressure with a two-stage system. As a result of these
features, a screw compressor of this design can be combined with an additional sub-cooling circuit or an inter

cooler) for two-stage expansion. These measures result in a clearly increased

refrigeration capacity due to additional liquid sub-cooling, especially with high-pressure ratios. The power consumption

increases slightly compare to the additional work that takes place at a better level

With this form of operation, a heat exchanger (refrigerant sub-cooler) is used to sub-cooled liquid refrigerant. The su
cooling is achieved by injecting a part of the refrigerant from the condenser through an expansion device in counter

cooler, which then evaporates due to the absorption of heat. The superheated vapor is pulled into the

Economizer connection and mixed with the vapor, which is already slightly compressed from the

cooled liquid is at condensing pressure with this form of operation, the pipeline to the evaporator

atures, aside from insulation. The system can be generally app

cooler.

cooling is achieved with this form of operation by reducing the boiling point pressure in an intermediate

cooler) arranged between condenser and evaporator. This physical effect leads to

uid down to the boiling point, due to evaporation of part of the liquid. To stabilize the pressure of

the vessel, a regulator is used which at the same time controls the quantity of vapor flowing to

ration gives the most economical thermodynamic performance due to direct heat

exchanging. As the intermediate pressure is reduced to the boiling point temperature this system should only be used

shows the system with economizer, flash type sub-cooler.

When economizer is used, it is recommended to install a muffler before middle-pressure returned gas port in
compression chamber to effectively mitigate pulsation noise in middle pressure as shown in the drawing below
A filter and check valve are also recommended to install before ECO port of compressor.

flow out from the oil outlet connector and flow in to the oil inlet connector. If you don’t use external additional

, you should simply see a cover plate on this position which means the oil will pass this internal tunnel on

External oil circuit application

search a special design of the economizer

connection has been developed so that the connection causes no additional back flow losses during compression. As a

Please refer to Hanbell selection software for

As opposed to the reciprocating operation of a piston compressor, the compression in a screw compressor takes place
only with one flow direction. When the rotors turn, refrigerant vapor is pressed into the rotor grooves by the opposing
rotor teeth and transported to end wall of the corresponding working space. In this phase, the volume is steadily

The pressure at the additional

stage system. As a result of these

cooling circuit or an intermediate

stage expansion. These measures result in a clearly increased

pressure ratios. The power consumption

increases slightly compare to the additional work that takes place at a better level of efficiency.

cooled liquid refrigerant. The sub-

cooling is achieved by injecting a part of the refrigerant from the condenser through an expansion device in counter

cooler, which then evaporates due to the absorption of heat. The superheated vapor is pulled into the

Economizer connection and mixed with the vapor, which is already slightly compressed from the

cooled liquid is at condensing pressure with this form of operation, the pipeline to the evaporator

atures, aside from insulation. The system can be generally applied. Figure 51