DK Suction Gas Heat Exchanger

The best choice
in heat recovery and cold water systems.
DK Suction Gas Heat Exchanger
tc +40°C
Condenser
-25°C
Header
Example:
to -30°C
tc +40°C
R 404A
+40°C
+30°C
Dryer
-5°C
-5°C
Inspection glass
TEV
to -30°C
Evaporator

The best choice
in heat recovery and cold water systems.
DK Suction Gas Heat Exchanger
-Details at a glance-
Application: all R404A/R507 refrigeration units with evaporation temperatures < = +5°C
Operation: Installation in suction and fluid line. The fluid is super-cooled by the cold
suction gas, in return for which the suction gas is overheated by the warm
fluid.
Background: Refrigeration units with semi-hermetic piston compressors offer greater
refrigeration capacities with increasing suction temperature of the suction gas
by up to +25°C and strongly super-cooled fluid
Advantages: The refrigeration unit, depending on application, achieves up to 15% greater
performance with the suction gas heat exchanger compared to a refrigeration
unit without exchanger.
In spite of a greater refrigeration performance the input power remains
almost even.
This results in an enhanced performance figure Qo/Pe
If a suction gas heat exchanger is taken into account during planning then
smaller compressors can be chosen. This results in a reduction of the
applied electric energy, which throughout the entire year results in
significant savings.
Smaller tube dimensions can be chosen
➔lower investment costs
Enhances use of heat recovery since hot gas temperatures rise.
Special note: The use of a suction gas heat exchanger requires the careful layout of the
solenoid valves and e-valves.

Fluid IN
_____mm
green/red
Fluid IN
_____mm
green/red
Suction line OUT
..............mm
blue/red
Suction line OUT
..............mm
blue/red
Fluid IN
_____mm
green/red
Suction line OUT
..............mm
blue/red
The best choice
in heat recovery and cold water systems.
DK Suction Gas Heat Exchanger
-Suction Line Connection Options-
Side View
- Top connections -
Distance mounting
- Bottom connections -
Distance mounting
- Top/bottom connections -
Distance mounting
Suction line IN
.............mm
blue
Suction line IN
.............mm
blue
Suction line IN
.............mm
blue
Fluid OUT
____mm
green
Fluid OUT
____mm
green
Fluid OUT
____mm
green

DK Suction Gas Heat Exchanger (1.0 m)
Made of Cu tube with inserted single-walled
finned tube including mounting and insulation.
Model 42/3x13 54/5x13 64/7x13 76/9x13 89/12x13 108/20x13 133/30x13 159/40x13 219/64x13
Tubular
shell
No. of
inner tubes
Length of
inner tubes/ mm
Distance mounting
Length / total
construction
Height / total
construction
Suction
line mm
Fluid line/mm
Surface LP-carrying
side/m 2
Capacity of
exchanger in Watt 1)
Shell volume (LP-
carrying side) in dm 3
Tube volume (HP-
carrying side) in dm 3
42 mm 54 mm 64 mm 76 mm 89 mm 108 mm 133 mm 159 mm 219
3x13 5x13 7x13 9x13 12x13 20x13 30x13 40x13 64x13
1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000
500 500 500 500 500 500 500 500 500
1.250 1.250 1.300 1.300 1.300 1.350 1.350 1.400 1.450
360 370 380 400 420 450 480 500 560
28 35 42 54 64 76 89 108 133
12 16 22 22 28 35 42 54 64
0,48 0,8 1,12 1,44 1,92 3,2 4,8 6,4 10,24
1.550 2.590 3.620 4.665 6.220 10.360 15.550 20.700 33.100
0,8 1,3 1,9 2,8 4,0 5,5 8,3 12,4 26,1
0,26 0,35 0,5 0,6 0,8 1,3 2,0 2,8 4,8
Maximum operating pressure: Shell 16 bar Tube 28 bar
The best choice
in heat recovery and cold water systems.
1) Performance quoted for R404A design:
Refrigeration units:
Super-cooling of fluid from +40°C to +35°C – overheating of suction gas from +-0°C to +10°C
Deep-freezing units:
Super-cooling of fluid from +40°C to +30°C – overheating of suction gas from –25°C to –5°C