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- Heat pump - the heart of a drying kiln
- Completely automated
- Drying of all types of wood regardless of the starting moisture content
- Communication
- Minimal energy consumption:
100 - 250 kWh per m3
of timber for entire drying cycle
- Installed power 1kW per m3 of timber
- Maximal working temperature 60 °C
- Exceptional quality of drying
- Best quality of natural (untreated) wood
- Environment friendly
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Dehumidifying kiln
scheme:
- Heat pump
- Drain pipe
- Openings for absorbing of cold and moist air from the chamber into the heat
pump
- Openings for insufflating of warm and dry air from the heat pump into the
chamber
- Humidifying system (atomizers)
- Heat exchanger (in combined kilns only)
- Flow fans
- Air exchange system (intake and exhaust flaps)
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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)
| MC-502R |
(Obsolete!
This model is no longer produced!)
Wood MC meters:
Portable moisture meter RVD-904
Nondestructive moisture meter DVD-240
Other:
Control unit for
steaming chambers PD-02
ISPM-15 wood
pallet sterilization unit MKS-05
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Dehumidifying kilns belong to newer wood drying technologies.
These kilns are also called condensing wood dryers (drying kilns). Condensation of water (dehumidification) is used for separating moisture from
wood, without external air exchange. Our kilns are completely automated, which
means that with the equipment, user also receives a wood drying technology.
Kiln can be constructed or assembled of aluminum bearing structure.
Most important part of a dehumidifying kiln is a
heat pump. 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. Dried, reheated air
comes back to kiln chamber. Energy consumption is minimal, since there is almost
no inner/outer air exchange. Air circulation in these kilns is smaller than in
conventional kilns while the electrical power of flow fans and heat pump
equals approximately the power of flow fans in
conventional kilns.
Automatic control unit especially designed in "NIGOS-elektronik"
controls drying process.
Automatic control unit has built-in programs for
drying of all wood types regardless of a starting wood moisture content. It
controls drying process automatically, so the operator presence is not needed
during drying.
User have an ability to connect up to 15 kilns to a single PC computer, and
control the drying process from a distant place (office or some convenient room)
up to 1000 m away.
Average energy consumption is approximately 30% - 60% of installed power,
which is up to 1kW per m3 of timber
(as shown in technical data tables below). If we monitor the whole drying cycle,
energy consumption is about 100 - 200kWh per m3
for the whole drying cycle.
Larger energy consumption is only during first
day during heating stage when electrical heaters are turned on until
working temperature is reached. Later, during drying stage these heaters
are rarely turn on.
If a boiler installation exists in the drying complex, it
makes sense to mount heat exchangers for hot
water or steam (depending on the boiler) in the kiln. In that case, energy from
the boiler would be used for heating of the drying chamber. That way kiln
becomes combined (automatically uses boiler heat). This option is
interesting only for a large capacity kilns and in the cases where electrical
power supply is unstable (large voltage or current oscillation or frequent power
cut-downs during winter periods). Drying is in that case performed in
conventional way, heat pump is turned-off, and electrical energy is used only
for flow fans. Combined kiln unites good characteristics of both dehumidifying
and conventional kiln. That provides the
greatest drying quality with the least energy consumption for the shortest time.
Drying quality in dehumidifying kilns
is significantly better than in any conventional kiln, because the drying is
equable in whole timber load, so there is no danger of developing degrade in the
timber (cracks, checks, warping...). drying is fast enough since the working
temperature can reach up 60 0C to. These kilns are environment
friendly because all wastes that are produced during drying process are harmless
for water and environment.
Especially good results are achieved with
drying of natural (untreated) wood (beech, ash,...).
"NIGOS - elektronik" gives its
customers 1 year warranty for whole kiln and heat pumps, and 5 years
for the automatic control unit.
Approximate time of drying
Type of
wood |
Drying in days from 70% to 10% and from 40% to 10%
of wood
moisture content for various timber thickness |
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25mm |
38mm |
50mm |
70mm |
from 70%
to 10% |
from 40%
to 10% |
from 70%
to 10% |
from 40%
to 10% |
from 70%
to 10% |
from 40%
to 10% |
from 70%
to 10% |
from 40%
to 10% |
|
Oak |
20 |
13 |
35 |
22 |
52 |
32 |
75 |
52 |
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Ash |
15 |
10 |
25 |
15 |
38 |
24 |
60 |
42 |
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Beech |
10 |
7 |
16 |
11 |
25 |
16 |
41 |
28 |
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Birch, poplar |
6* |
4* |
11 |
8 |
14 |
10 |
21 |
14 |
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Pine, fir, juniper |
6* |
4* |
9 |
7 |
12 |
9 |
18 |
13 |
Comment: Times marked with * can be achieved
in combined kilns only.
Technical data
| Model |
Capacity
range
(m3) |
Heat
pumps |
Flow fans
power
(kW) |
Inst.
power
cca(kW) |
Average
consumption
cca(kWh) |
Optimal
dimensions
of chamber
(axbxh)(m) |
| NIGOLUX-12 |
8 - 15 |
1xTP-15 |
1.6 |
10 |
4 |
4.6x4.5x3.0 |
| NIGOLUX-20 |
15 - 25 |
1xTP-25 |
3.0 |
18 |
8 |
4.6x6.2x3.8 |
| NIGOLUX-30 |
25 - 35 |
1xTP-30 |
6.0 |
24 |
11 |
4.6x6.5x5.2 |
| NIGOLUX-40 |
30 - 50 |
TP-15 + TP-25 |
9.0 |
36 |
16 |
6.8x7.0x5.2 |
| NIGOLUX-60 |
50 - 70 |
2xTP-25 |
12.0 |
48 |
22 |
8.6x7.0x5.2 |
| NIGOLUX-80 |
70 - 100 |
3xTP-25 |
13.5 |
70 |
32 |
8.6x8.2x5.2 |
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