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Serbian version 

Russian version

Wood dryers (drying kilns) catalogue (.PDF 4MB)
Wood dryers (drying kilns) catalogue (.PDF 4MB)

Catalogo Secadores de madera (.PDF 4MB)
ESP/ENG Catalogo secadores de madera / Wood dryers (drying kilns) catalogue (.PDF 4MB)

Katalog holztrockner Catalogue de sechoirs a bois (.PDF 4MB)
GER/FRA Katalog Holztrocknung / Catalogue de Séchoirs à bois (.PDF 5MB)

 Measurement & control equipment catalogue (.PDF 2.8MB)
Measurement & control equipment catalogue (.PDF 2.8MB)

Since 1990


Heat pumps

Heat pump back
Heat pump front

Wood dryers:

Conventional kilns
Dehumidifying dryers
Mini (Low-cost) kilns (NKS)
Heat pumps
Additional equipment
Power electric switch board

Catalogues and manuals:
Wood dryer catalogue (.pdf 3.7MB)
NIGOS dryers (.pdf 956KB)
User manuals
Measurement&controll equipment catalogue (.pdf 2.8MB)

Automatic controllers for wood drying:

MC-411R, MC-412, MC-504,
MC-600, MC-904, MC-2000
Automation of existent conventional kilns

Archive (obsolete products no longer produced):
 (MC-100RM, MC-500R, MC-502R, MC-900R, MC-100R, MC-1000)

Wood MC meters:
Portable moisture meter RVD-904
Nondestructive moisture meter DVD-240

Control unit for steaming chambers PD-02
ISPM-15 wood pallet sterilization unit MKS-05

If automatic controller is the brain, then the heart of dehumidifying wood drying kiln is a heat pump. Heat pumps are also called dehumidifiers or dehumidifying units for wood drying kilns - which are also known as condensing wood dryers.

Main parts of heat pump are: compressor, evaporator (cold section), condenser (warm section), heat pump fans and finned electrical heaters. Heaters mainly work in the heating stage so that optimal conditions in the kiln are achieved, after which drying process starts.
In the drying stage heaters are rarely or ere not used at all. Air in the kiln passes through the load of timber and absorbs moisture from the wood. Part of that air circulates through the heat pump where the moisture is condensed and drained out of the chamber. This process alone consist of few consecutive stages. First heat pump fans aspirate air from the drying chamber and force it to pass through the heat pump. Moist, damp air pass over evaporator (cold section) first, where the moisture is condensed, and water is collected and drained out of the chamber. The air then passes over condenser (warm part) where is reheated without the use of the electrical heaters. If needed, air can be additionally heated on electrical heaters, but during drying this rarely occurs, so the energy consumption is significantly low. Dried, reheated air comes back to kiln chamber and the whole process starts again.

Environment friendly refrigerant R134a is used for heat pump operation.

Heat pumps are mounted on the 500 mm high chassis, outside the drying chamber next to wall. There are two openings on the wall (lower one for suction of the moist and damp air from the chamber, and higher opening for blowing of dry reheated air back into chamber).

Technical data for heat pumps can be found in the following table:

Heat pumps  Model TP-15  Model TP-25
 Capacity (8 to 20) m3 of timber (15 to 25) m3 of timber
 Compressor (HP) 5 8
 Compressor electrical power (kW) 3.6 6
 Maximum heating power (kW) 11 18
 Internal fans 1xØ450mm (0.4kW) 2xØ450mm (0.8kW)
 Maximum condensation
(L / 24h)
200 460
 Electrical heaters
6 9
 Operating temperature 25°C to 60°C 25°C to 60°C
 Refrigerant R134a R134a
 (a x b x h)(mm)
1500 x 750 x 1700 2000 x 520 x 1300
 Weight (kg) 120 180

©2011 NIGOS-elektronik

18000 Nis • Srbija • Borislava Nikolica - Serjoze 12
Phone/fax. +381 18 / 211-212, 217-468 • E-mail: