INNOVATION IN
CORE Technology
The Fifth Generation Ultra-Cold
Refrigerant Air Dryer
KDH-290AH
KDH-070AH
02
AIR DRYER DEVELOPMENT HISTORY
Each generation has undergone technical improvements and innovations in the
development process.
Air Air
First Generation: Air Cooling Water Removal
No refrigeratio system;
Forced cooling by fan; Air Air
Referigerant
High dew point;
Poor water removal capacity
Referigerant
Second generation: Normal inlet temperature type
refrigerated air dryer
With refrigeration system, primary heat transfer
structure;
The reachable dew point is lower than the air cooling
water eliminator;
Referigerant Cyclone water removal structure, up to 90% water
removal;
Condensation may occur on the outlet pipe wall unless
Referigerant
insulated;
Effective for inlet temperature ≤ 45°C;
Thrid generation: High inlet temperature type
refrigerated air dryer Referigerant IN
3 additional heat exchange structures to the
second generation;
The dew Point is lower than the second generation Air Inlet
machine;
Referigerant OUT
Low dew point compared to second generation
stable performance; Air Outlet
Cyclone structure, improving water removal rate to
≥ 96%;
For maximum effectiveness, inlet temp ≤ 60°C;
The welding process is many and complicated;
long production cycle;
The Fifth Generation Of Ultra-Cold Fourth generation: Refrigerated Plate-fin heat
Environmentally Refrigerated Air Dryer exchanger refrigerated air dryer
Unique design, primary heat exchange and secondary heat The plate-fin type heat exchanger is compact and
small in size;
exchange interation
High heat exchange efficiency, low dew point and
Using environmentally friendly refrigerant compressors stable;
Effective for inlet temperature ≤ 60 °C;
and refrigerant R410A etc. No ozone layer damage.
Narrow spacing between plate fins may easily cause
At the evaporator the eliptical smooth fins to efficiently blockade, difficult to clear;
The pressure drop increases due the blockade of the
separate oil and water droplets, maximize the use of cold
time;
capacity. The temperature difference between the inlet and
outlet is small.
The eliptical tins of evaporator tube reduces blockade due
Aluminum fin evaporator, fragile and corrode with
to oil residue hence. time.
Stainless steel shell,diminishing secondary pollution due to
corrosion.
Unique spiral structure of heat exchanger tube, increasing
heat exchange efficiency.
03
INNOVATION CORE Technology
The Fifth Generation Ultra-Cold
Refrigerated Air Dryer
Air Outlet
Air Inlet
Stainless Steel Housing Heat Exchanger
Standard Condition
Condensate Separation Outlet Inlet Temperature : ≤60°C
Air Outlet
Cooling method : air cooling
Air Inlet
Ambient temperature : 2-50°C
Pressure dew point : 2-10°C
Maxsimum inlet air pressure : 1.3 Mpa
Pressure drop : ≤0.02
WORKING PRINCIPLE
The process of compressed air during work:
Raw compressed air enters through inlet (h), into pre-
Condensate Separation Outlet
cooling chamber with spiral tubings (g), inside outgoing
low temperature compressed air goes through the
spiral tubes and cool the raw compressed air that slows
at the outside of the spiral tubes. The raw compressed
Heat exchange core with
air goes through the pot hole (R), into the evaporator
integrated scondary
chamber the evaporators (f), in the chamber cool the
condensation , increase
compressed air to 2 to 10°C water condesate goes out
heat exchange efficiency by
through outlet (c), water contact is forthur extracted by
20%.
stainless steel filter net (e), Dry compressed air goes
Corrrosion-resistant
out through outlet (i).
stainless steel casing to
prevent secondary pollution.
Flow chart of compressed air
during work
a- Refrigerant inlet
b- Refrigerant outlet
c- Water condensed outlet
d- Mounting bracket
f- Evaporators
e- Stainless steel
g- Spiral tubes cooler
h- Air inlet
i- Air outlet
04
Technical Specification
Note : For KDH-550 above use carbon steel housing evaporator
According to DIN ISO7 183, the design of the dryer is based on the following parameters: working pressure 7 bar, ambient
temperature 45 °C. For different working pressure and temperatures, the following corection coefficient to be used.
Compressed air inlet temperature, inlet pressure correction coefficient (C1)
Ambient temperature correction factor (C2) (for air-cooled only)
Pressure dew point correction factor (C3)
Air flow under different operating conditions can be obtained by multiplying the nominal flow rate in the
spesification table with the correction factor.
Actual dryer throughput = nominal flow x (coefficient C1 x coefficient C2 x Coefficient C3).
