|
 Large air volumes:
3,400 - 120,000 m³/h.
Moisture removal:
55 - 2,000 kg/h.
The DryPac dehumidification systems are specially designed to use low levels of energy and to minimize total energy consumption. The DryPac system maintains the air at a constant, precise humidity regardless of weather conditions or load variations.
Using a DryPac system for air dehumidification usually results in a substantial saving in the running costs of the plant and investment in cooling equipment.
DryPac systems can dehumidify air to a relative humidity (RH) as low as 20%. The DryPac can handle target volumes of air.
Benefits/figures:
- cooling and heating takes place outside the unit;
- uses relatively cheap coolants, like well water, river and cooling tower water;
- units made of corrosion-proof metal or industrial heavy duty plastic;
- more than 15 years experience;
- vertical air flows (VPT), counter current flow (air-DrySol); so very good performance; or horizontal air flows (HPT);
- high efficiency;
- operates as a humidifier too;
- energy savings;
- microbiological decontamination;
- performance reliability;
- precise humidity and temperature control;
- low running costs.
Working principle
Dehumidifier:
A hygroscopic salt solution called DrySol is pumped around and sprayed into dehumidfier/conditioner (A). Humid air (from outside or recycled air) passes into the conditioner. This air comes into close contact with the hygroscopic salt-solution spray, which absorbs the moisture present in the air. Dry air leaves the top of the unit.
The salt solution including the absorbed moisture is collected in the lower part of the unit. By subsequently cooling the salt solution, the air is cooled and dried simultaneously. Droplet Eliminators at the air outlet of the dehumidifier ensure that the air stream does not contain any salt-solution particles.
Regenerator:
To ensure a fixed concentration of salt in the dehumidifier and therefore a stable drying capacity, the absorbed moisture has to be evaporated again. Therefore, a part of the (diluted) salt solution is pumped to the 'regenerator' (B).
Here, the hygroscopic salt solution is pumped and sprayed around again. At the regeneration side, water is evaporated by heating the salt solution. A minor secondary air stream, passing through the regenerator absorbs this moisture and takes it outside. The more concentrated salt solution returns to the dehumidifier.
The process flow diagram shows that the 'cold' (diluted) salt solution from the dehumidifier meets the 'warm' salt solution in the regenerator. A heat exchanger placed between these flows will preheat the 'cold' solution before it enters the regenerator. The 'warm' solution will give off heat, and will thus cool down before it is used in the dehumidifier again.
Low energy consumption
DryGenic air-dehumidification systems have the lowest energy consumption in comparison to all other air drying equipment in the world. In respect to conventional condensation air drying equipment the energy costs of a DryGenic dehumidifier are usually 50 to 60% less.
 Besides the low energy consumptions we very often use very cheap cooling media. The main factor for the determination of the required cooling media temperature is the desired air outlet temperature. The temperature of the cooling media should generally be 5 to 7°C below the desired air temperature.
Generally speaking Imtech DryGenic’s energy costs are at least 50% lower than those of a refrigeration coil system.
If, for instance, a DryGenic system is set at 25°C / 20% relative humidity (dew-point of 0°C), the systems needs a cooling media that has a temperature of approximately 20°C. Thus, the system can typically operate on cheap cooling media with a relatively high temperature, such as water from a river, well, sea, or cooling tower.
Removal of airborne micro-organism
Extensive research carried out by the Research Foundation of Toledo University of Ohio, USA, shows that virtually all germs and micro-organisms are killed in an absorption dehumidification system. The hygroscopic salt absorbs moisture from the air, and in addition, virtually all water contained in any micro-organisms present.
Based on a normal distribution of bacteria in the outside or return air about 97% of the bacteria is washed out of the air and eliminated in the hygroscopic solution
 This spells instant death for most germs, moulds etc. The salt's germicidal action does not wear off, in contrary to a bacteria filter, which has to be replaced or cleaned regularly. A major advantage in processes or spaces requiring sterile air. In addition to the system's excellent germicidal action, it also removes gasses and solid particles from the air, resulting in a reduced emission to the environment.
The system enables complete recycling of air. Any pollution present, such as dust particles are 'scrubbed' from the air by the salt solution. A DryGenic dehumidifier can be used as humidifier as well. By simply adding demineralised water or steam condensate to the salt solution, air can be humidified hygienically during the cold, dry winter months.
DIMENSIONS
The DryPac conditioners are constructed in two different versions:
- a vertical flow (VPT) and
- a horizontal flow (HPT) unit.
 
The horizontal conditioners are used for technical rooms which are not higher than 3 meters.
The DryPac regenerators are available as standard:
- as P-regenerator (vertical)
- on special request a horizontal regenerator can be selected
VPT – CONDITIONERS
The vertical conditioners have the following dimensions and operating weights, see table 1.
On top of these VPT conditioners is the dry air outlet duct placed, meaning the actual height will be slightly higher.
|
Conditioner Type
|
Air flow [m³/h]
Max.
|
Length
[mm]
|
Width
[mm]
|
Height
[mm]
|
Oper. Weight
[kg] 2
|
VPT 200 |
4,500
|
1,250
|
1,465
|
2,700
|
750
|
|
VPT 400
|
9,000
|
1,825
|
1,465
|
2,700
|
1,000
|
|
VPT 600
|
12,000
|
2,205
|
1,465
|
2,700
|
1,150
|
|
VPT 800
|
16,250
|
1,905
|
2,070
|
2,750
|
1,300
|
|
VPT 1000
|
20,000
|
1,905
|
2,400
|
2,800
|
1,500
|
|
VPT 1500
|
30,000
|
2,600
|
2,400
|
3,000
|
2,250
|
|
VPT 2000
|
40,000
|
3,200
|
2,400
|
3,000
|
2,750
|
|
VPT 2500
|
50,000
|
3,800
|
2,400
|
3,000
|
3,200
|
|
VPT 3000
|
60,000
|
4,400
|
2,400
|
3,000
|
3,600
|
|
VPT 4000
|
80,000
|
5,700
|
2,400
|
3,000
|
4,600
|
|
VPT 5000
|
100,000
|
6,950
|
2,400
|
3,000
|
5,500
|
|
VPT 6000
|
120,000
|
8,150
|
2,400
|
3,000
|
6,500
|
HPT – CONDITIONERS
The horizontal conditioners have the following dimensions and operating weights, see table 2
|
Conditioner Type
|
Air flow [m³/h]
Max.
|
Length
[mm]
|
Width
[mm]
|
Height
[mm]
|
Oper. Weight
[kg] ] 2
|
|
HPT 1000
|
20,000
|
1,900
|
2,400
|
2,900
|
1,700
|
|
HPT 1500
|
30,000
|
2,600
|
2,400
|
2,900
|
2,600
|
|
HPT 2000
|
40,000
|
3,200
|
2,400
|
2,900
|
3,150
|
|
HPT 2500
|
50,000
|
3,800
|
2,400
|
2,900
|
3,650
|
|
HPT 3000
|
60,000
|
4,400
|
2,400
|
2,900
|
4,150
|
|
HPT 4000
|
80,000
|
5,700
|
2,400
|
2,900
|
5,500
|
|
|
100,000
|
6,950
|
2,400
|
2,900
|
6,500
|
|
HPT 6000
|
120,000
|
8,150
|
2,400
|
2,900
|
8,000
|
P – REGENERATORS
The different types of regenerator are explained in table 3
|
Regenerator Type
|
Air flow [m³/h]
Inlet
|
H2O Removal
[kg/h]
|
Length
[mm]
|
Width
[mm]
|
Height
[mm]
|
Oper. Weight
[kg] 2
|
2,5 P |
1,350
|
70
|
1,300
|
1,010
|
2,550
|
700
|
|
5 P
|
2,700
|
140
|
1,170
|
1,465
|
2,750
|
850
|
|
10 P
|
4,500
|
280
|
1,750
|
1,465
|
2,750
|
1,200
|
|
15 P
|
8,100
|
380
|
2,125
|
1,465
|
2,750
|
1,450
|
|
20 P
|
10,700
|
510
|
1,950
|
2,075
|
2,820
|
2,000
|
|
24 P
|
12,900
|
600
|
1,950
|
2,400
|
2,820
|
2,200
|
|
36 P
|
19,300
|
900
|
2,550
|
2,400
|
2,820
|
2,800
|
|
48 P
|
25,800
|
1,200
|
3,250
|
2,385
|
2,820
|
3,500
|
|
60 P
|
32,200
|
1,500
|
3,850
|
2,400
|
2,820
|
4,100
|
|
72 P
|
38,700
|
1,800
|
4,450
|
2,400
|
2,820
|
4,650
|
|
