HP
LP
4
1
2
3
CC-0044
1
2
3
4
3D flexibility
U Trap
Upper loop
Condenser
Figure 15: Discharge lines
Heat exchangers
To obtain optimum efficiency of the complete refrigerant system, optimised R410A heat exchangers must be used.
R410A refrigerant has good heat transfer properties: it is worthwhile designing specific heat exchangers to gain in
size and efficiency.
An evaporator with optimised R410A distributor and circuit will give correct superheat at outlet and optimal use of
the exchange surface. This is critical for plate evaporators that have generally a shorter circuit and a lower volume
than shell and tubes and air cooled coils.
For all evaporator types a special care is required for superheat control leaving the evaporator and oil return.
A sub-cooler circuit in the condenser that creates high sub cooling will increase efficiency at high condensing
pressure. In R410A systems the positive effect of sub cooling on system efficiency will be significantly larger than in
R22/R407C systems.
Furthermore, for good operation of the expansion device and to maintain good efficiency in the evaporator it is
important to have an appropriate sub cooling. Without adequate sub cooling, flash gas will be formed at the
expansion device resulting in a high degree of vapour at the expansion device inlet leading to low efficiency.
© Danfoss | Climate Solutions | 2022.09
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Scroll compressors, CH290 and CH485 | Mechanical connections