Aldacs
ALDACS are characterized by the following main functionalities and features:
|
1 |
No direct contact between Air and Desiccant: These streams are separated by a pervious Membrane; |
|
2 |
Heat Recovery between Exhaust Air (ETA) and Fresh Air (ODA); |
|
3 |
Cooled air dehaydration; |
|
4 |
Indirect Evaporative Cooling (IEC) of the Supply Air (SUP) |
|
5 |
Heated regeneration of the Liquid Desiccant; |
|
6 |
Heat recovery between the regeneration Exhaust Air (EHA) and the regeneration Fresh Air (ODA); |
|
7 |
Chemical Energy Storage in liquid desiccant at two different (Low and High) concentrations; |
|
8 |
Non-simultaneous operation of the Conditioner and Regenerator required; |
|
9 |
Operation of multiple (distributed) Conditioners, with centralized Regeneration; |
|
10 |
Complete absence of mechanical cooling; |
|
11 |
Extremely low electric power requirements. |
The Conditioner
The whole Air Conditioning Process takes place in a Conditioner Block.
The following Operations take place in the Conditioner Block:
1 |
Air Filtering at inlet to the Block; |
2 |
Pre-Cooling by the Exhaust Air (EHA) in the HRHX; |
3 |
Air Dehydration in the Air Drier; |
4 |
Cooling in the IEC (Indirect Evaporative Cooler), using the Return Air (ETA); |
5 |
Heat Recovery before exhaust in the HRHX. |
The Regenerator
The desiccant regeneration is carried out in a Regenerator Block, that may also include a Desiccant Storage.
The following Operations take place in the Regenerator block:
1 |
Air Filtering at the Block Inlet; |
2 |
Pre-Heating of the regeneration air in the HRHX; |
3 |
Air Hydration in the DESHX; |
4 |
Heat Recovery from the regeneration air in the HRHX; |
5 |
Desiccant from DSS is dehydrated in the DESHX and delivered to the CSS; |
6 |
Heat Recovery in the DHRHX between the Desiccant returning from the DESHX to the CSS, and that leaving the DSS to the DESHX. |
Components of ALDACS
ALDACS Components in the Conditioner and the Regenerator Blocks are of the following types:
1 |
Heat Exchangers; |
|
2 |
Heat and Mass Exchangers; |
|
3 |
Chemical Storage; |
|
4 |
Circulator Pumps; |
|
5 |
Ventilators; |
|
6 |
Sensors for various kinds of Magnitudes: |
|
1 |
Temperature; |
|
2 |
Relative Humidity; |
|
3 |
Differential Pressure; |
|
4 |
Liquid Level; |
|
5 |
Liquid Desiccant Concentration1; |
|
6 |
Active Electric Power; |
|
7 |
etc. |
|
7 |
Actuators of various types: |
|
1 |
Dampers; |
|
2 |
Liquid Mixing Valves; |
|
3 |
Liquid Diverting Valves; |
|
4 |
Magnetic NO & NC Valves; |
|
5 |
etc. |
|
8 |
Control & Regulation System. |
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Notes & References
[1] Liquid desiccant concentration; is measured indirectly. In fact two magnitudes are measured, temperature and electrical conductivity. The concentration, as salt mass fraction, may then be calculated.
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