DUAL EVAP REFRIGERATION

DUAL EVAPORATOR SYSTEM

DUAL EVAPORATOR SYSTEM
What is a “Dual Evaporator System” ?
As far as we know there is no classic definition for dual evaporator system. The two evaporators may be connected in different ways with the capillary tube(s) and compressor.
Aditional valves are required depending on the system assembly. The most used ones are the directional valve at the end of the condenser and /or a check valve at the end of the freezer compartment.
In some systems there is no connection between the evaporators and the systems are independent, with two compressors. This system is also called dual evaporator system.

SINGLE-LOOP DUAL-EVAPORATOR IN-SERIES
SYSTEM ( Liebherr/Brastemp/Bosch/Electrolux)
ONE COMPRESSOR + TWO IN-SERIES
EVAPORATORS + ONE CONDENSER
The compressor operates at the freezer evaporation temperature, and therefore the system overall efficient is also quite
LOW.
The FFC air and the FZC air circulate separately preventing the transfer of food odors, but the TEMPERATURE CONTROL of the compartments is rather COMPLEX.

SINGLE-LOOP DUAL-EVAPORATOR IN-PARALLEL
SYSTEM ( GE / Viking / LG ( patent) / )
ONE COMPRESSOR + TWO PARALLEL
EVAPORATORS + CYCLING VALVE + ONE
CONDENSER
The FFC evaporation temperature is higher than the FZC evaporation temperature. This provides a higher efficiency, but the REFRIGERANT
CHARGE can NOT be OPTIMIZED for both evaporators.
The FFC air and the FZC air circulate separately. However, as only ONE
COMPRESSOR provides refrigeration for both compartments, the TEMPERATURE
CONTROL is also rather COMPLEX.

DUAL-LOOP DUAL-EVAPORATOR SYSTEM
(Sub-Zero/Viking/Bosch/Liebherr (?) )
TWO COMPLETELY SEPARATE refrigeration loops provide refrigeration for each compartment.
The FFC evaporation temperature is higher than the FZC evaporation temperature and this increases the system efficiency. The REFRIGERANT
CHARGE can be OPTIMIZED for both evaporators, and this provides a
further