Documentatie atasata la

Dezumidificatoare industriale pentru aplicatii cu umiditate foarte redusa DST

Dezumidificatoarele desicante - Why / How DST

Limba: Engleza

19 afisari

Tip documentatie: Catalog, brosura

Pagina 1 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza Sorption...

Sorption Dehumidifying Why? How? Contents Why? ............................................................................................................................4 Corrosion ..................................................................................................................4 Condensation ...........................................................................................................4 Ice formation ............................................................................................................5 Handling of hygroscopic material .............................................................................5 Drying out buildings ..................................................................................................6 Mould .......................................................................................................................6 Product drying .............................................................................

Pagina 1-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza Sorption
Dehumidifying
Why?...

Pagina 2 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza .....................

.............................6 Electronics ................................................................................................................7 Bacteria ....................................................................................................................7 Odours .....................................................................................................................7 How much? .................................................................................................................8 Determine what climate is needed. ..........................................................................8 Moisture load from infiltration ...................................................................................8 Moisture load from people ........................................................................................8 Moisture load from water surface .............................................................................8 Moisture e

Pagina 3 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza vaporated from...

vaporated from products .........................................................................8 Moisture load through diffusion ................................................................................8 Choose a dehumidifier .............................................................................................9 Moisture load .......................................................................................................9 Process air inlet climate .......................................................................................9 Regeneration air inlet climate ..............................................................................9 The process of sorption drying...............................................................................10 Recusorb R ............................................................................................................10 Recusorb DR ...............................................................................

Pagina 3-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza vaporated from products ........

Pagina 4 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza .....................

...........................11 Consorb .................................................................................................................11 Frigosorb ................................................................................................................11 Econosorb ..............................................................................................................11 The sorption rotor ....................................................................................................12 Structure .................................................................................................................12 Desiccant ...............................................................................................................12 Dust from the rotor .................................................................................................13 Washable rotors ..........................................................................................

Pagina 4-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza ...........................11...

Pagina 5 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza ...........13...

...........13 Bacteria formation ..................................................................................................13 How to install ............................................................................................................14 Room drying ...........................................................................................................14 Object drying ..........................................................................................................14 Dehumidifier in a ventilation system .......................................................................16 Dew-points around the world ..................................................................................17 Europe ....................................................................................................................17 Asia ........................................................................................................................18 Australia .......

Pagina 5-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza ...........13
Bacteria...

Pagina 6 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza .....................

..........................................................................................................20 Africa ......................................................................................................................20 North America ........................................................................................................20 South America ........................................................................................................21 Moisture content table .............................................................................................22 Psychrometric chart .................................................................................................25 Why? Corrosion Iron and steel doesn't rust if the air over the surface has a relative humidity below 50%RH.  < 50%RH > 50%RH Condensation A surface will not have condensation on it if the air in contact with it has a dewpoint lower than the surface temperature. x < �

Pagina 7 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza �C dp

x > °C dp
...

�C dp x > °C dp Ice formation A surface will not have ice formation on it if the air in contact with it has a dewpoint lower than the surface temperature. x < °C dp x > °C dp Handling of hygroscopic material The quality of dry drugs, dry food, hard candy and other hygroscopic materials can only be maintained through production to the consumer if it is kept in contact with air at a low relative humidity. Most hygroscopic materials are "comfortable" at a relative humidity below 50%RH. There are some materials, for example instant powder for drinks, that require below 15 %RH.  < 50%RH  > 50%RH Drying out buildings When drying out moisture from buildings, new buildings or buildings with water damage, the most effective way is to use sorption dehumidifying. Heating will only move the moisture to another part of the building. Heating in combination with outdoor ventilation will create high energy costs. With sorption dehumidifying the moisture is taken out from the buildin

Pagina 7-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza �C dp

x > °C dp

Ice...

Pagina 8 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza g in a very energy...

g in a very energy efficient way. Dehumidifying Heating Mould Mould and fungus formation is prevented if the surrounding air is kept below 70%RH. < 70%RH  > 70%RH Product drying When drying products a low relative humidity is essential for a fast process. If the products dried are sensitive to high temperature, the low relative humidity can only be obtained with dehumidification. Dehumidifying No dehumidifying Electronics The characteristics of electronic products are changed at high relative humidity.  < 50%RH  > 50%RH Bacteria Bacteria needs humidity to survive and multiply. Often the humidity required for bacteria to multiply is found on hygroscopic material. If the surrounding air relative humidity is held below 50%RH most bacteria will not find a suitable environment to multiply. > 50%RH < 50%RH  < 50%RH Odours Bad smell will be drasti cal ly reduced if the relative humidity is kept below 50%RH.  > 50%RH How much? Determine what c

Pagina 8-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza g in a very energy efficient
...

Pagina 9 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza limate is needed.
...

limate is needed. How is the moisture causing a problem? Is it the relative or the absolute humidity? The temperature has also to be known in order to calculate the size of the dehumidifier. Moisture load from infiltration Infiltratoin is the natural leakage of ambient air into a dehumidified area. A badly sealed room can often have an infiltration rate in excess of 1,0 air changes/hour, while a well-sealed room may be as low as 0,1 air changes /hour. Moisture loads from air entering through structural openings and mechanical supply or extract ventilation systems should not be included in the infiltration moisture load. These loads can often exceed all other moisture loads and must therefore be calculated separately. mV = 1,2 • V • (x1-x2) / 1000 where mV = moisture load from infiltration [kg/h] V = total infiltration [m3/h] x1 = water content for ventilation air, in most cases outdoor air [g/kg] x2 = water content for the room air [g/kg] Moisture load from people People give out

Pagina 9-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza limate is needed.
How is the ...

Pagina 10 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza moisture to the ...

moisture to the room when they breathe and also through perspiration. People at rest give out around 0,05 kg/h, whilst a person working will give out around 0,3 kg/h. Moisture load from water surface The warmer the water the more moisture given out to the air. Also dry air and turbulent airflow across the water surface gives a high evaporation rate. mw = σ • A • (x1-x2) / 1000 where mw = moisture load from water surface [kg/h] σ = coefficient for vaporization, normally 25 [kg/(m2 h)] A = open water area [m2] x1 = water content for saturated air with the water temperature, see table page 21 [g/kg] x2 = water content for the room air [g/kg] Moisture evaporated from products It is very difficult to calculate the moisture load from products as there are so many variables involved. A rough estimation has to be done case by case and then trialed. Moisture load through diffusion There is some moisture load by diffusion through building fabrics. Compared to other moisture loads this

Pagina 10-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza moisture to the room when...

Pagina 11 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza is normally...

is normally negligible. Door will give ventilation every time it's opened. Example: 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012345678901234 123456789012345678901234567890121234567890123456789012345678901212

Pagina 11-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza is normally negligible.
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Pagina 12 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza...

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Pagina 13 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza...

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Pagina 13-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza 3456789012345678901234...

Pagina 14 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza...

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Pagina 15 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza...

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Pagina 16 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza...

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Pagina 17 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza 34
12...

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Pagina 18 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza 78901234
12
37°C...

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Pagina 19 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza 5678901234
12...

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Pagina 20 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza roximately 10% of...

roximately 10% of the weight is water. Estimate that 25% of the water is evaporated during one hour: mp = 95 • 0,1 • 0,25 = 2,4 kg/h 6. Total moisture load mtot = 0,12 + 0,3 + 0,88 + 2,4 = 3,7 kg/h Select a dehumidifier The following information has to be gathered before a dehumidifier can be selected: Moisture load Sum up above moisture loads. Process air inlet climate Normally the room air should be mixed with some ambient air (to create a positive pressure in the room or/and to provide ventilation for people) before it is dried through the dehumidifier. The temperature, TP1, and the moisture content, xP1, at the mixing point must be known. Regeneration air inlet climate The temperature, TR1, and the moisture content, xR1, in the regeneration inlet must be known. The design point is at the highest moisture content in the ambient air at the highest relative humidity (lowest temperature). The process of sorption drying Recusorb R Regeneration heater Rotor Regeneration air fan

Pagina 20-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza roximately 10% of the weight ...

Pagina 21 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza E
D

F

Wet air...

E D F Wet air outlet C Regeneration air inlet B Process air fan Dry air outlet Rotor motor Process air inlet Water content 15g/kg 10g/kg 5g/kg 0g/kg 20g/kg 25g/kg 30g/kg 140˚C .H. 1%R 120˚C E 40˚C Temperature 60˚C 80˚C 100˚C 4%R.H. F B /kg 100kJ C A kg 80kJ/ kg 60kJ/ kg 20kJ/ g 0kJ/k 10%R.H . 15%R.H . . 20%R.H D 20˚C RECUSORB is a continuous dehumidifier with internal energy recovery and able to reach very low dew points. During regeneration, sensible heat is adsorbed by the rotor material. This heat is transferred to a purge sector where the incoming regeneration air is preheated and its moisture content reduced. While less heat is now required to reach the final regeneration temperature, the air will also be at a much lower relative humidity. As a result of this, the dry air outlet is both cooler and drier than that achieved by other desiccant systems. 0˚C A kg 40kJ/ lpy Entha 30%R.H. 40%R.H. 50%R.H. 60%R.H. 80%R.H. 100%R.H. RECUSORB DR h

Pagina 21-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza E
D

F

Wet air outlet

C
...

Pagina 22 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza as one fan
for...

as one fan for both dry air and wet air. This gives an easier installation for over-pressurising the dehumidified room. CONSORB is suitable for for applications were low energy costs make the internal heat recovery of Recusorb unnecessary. Normally used with low regeneration temperatures. FRIGOSORB is suitable for applications were it is difficult to duct out the wet air from the dehumidified area. Thanks to the heat pump it is very energyefficient. ECONOSORB is the most energy-efficient way to dehumidify air. Thanks to the built in cooling the dry air has the same or lower temperature as the process inlet air. The sorption rotor Structure The rotor matrix is manufactured from alternate layers of flat and corrugated sheets. It is made to form a vast number of axial air channels running parallel through the structure. Desiccant Back in the fifties, when the desiccant rotor dehumidifier was invented, Lithium Chloride salt was used as the desiccant. Lithium Chloride absorbs the moi

Pagina 22-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza as one fan
for both dry air...

Pagina 23 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza sture through a...

sture through a chemical reaction. The disadvantage with a salt impregnated rotor is that it can't withstand high humidity. Saturated air will cause the salt to partially leave the rotor and thereby decrease the capacity and cause corrosion of the dehumidifier. Today more and more dehumidifiers use silica gel rotors. The silica gel adsorbs the moisture, the water molecules adhere to the surface of the silica gel. The advantage is that it can withstand saturated air and, if the silica gel is chemically bonded into the rotor, it has a very long lifetime. Dust from the rotor Both lithium chloride and silica gel rotors containing loose dessicant will cause some dust to leave the rotor with the dry air. Apart from possible damage on dried materials it will deteriorate the capacity of the rotor. Only rotors with chemically bonded silica gel will have no desiccant carry-over with the dry air. Washable rotors If the rotor is contaminated by accident or used in applications with contaminated

Pagina 23-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza sture through a chemical...

Pagina 24 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza air, for example...

air, for example oil mist, it is important that the rotor is washable. Bacteria formation Tests on a silica gel rotor used in a water sewage plant shows no bacteria formation on the rotor. This is thanks to the high temperature (above 120°C) when regenerating the rotor and also the low relative humidity in the dry air. How to install Room drying A room is kept dry where one or several items are stored. The dry air is distributed around the room at a high level. Normally a part of the process air inlet to the dehumidifier is return air from the room. A room with little air leakage is essential for a good result. The advantages are no extra work when the stored items shall be used and it's possible to reach low moisture contents without pre-cooling. No frost problems on pre-cooling even at temperatures below 0°C. Disadvantage is that it is a large volume of air to dehumidify. Dampers Wet air outlet Dehumidifier Type Recusorb DR Humidistat Dry air outlet Distributed at a high l

Pagina 24-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza air, for example
oil mist,...

Pagina 25 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza evel as dry
air...

evel as dry air is heavier than humid air Process air inlet 2 20-30% more airflow than the wet air outlet, to create an over-pressure in the room. Process air inlet 1 Object drying The dry air flow from the dehumidifier is pushed into or over the object or objects to be dehumidified. No return air back to the dehumidifier. Advantages are easy installation as the whole room doesn't have to be sealed and small volume of air to dehumidify. The disadvantage is that it is more work each time the objects are used. Dry air outlet The moisture content Directed to the dehumidified in contact with the objects objects. is determined by the ambient air and the Δx of the dehumidifier. Process air inlet 5-10% of the process air inlet is taken from ambient, to create an over-pressure in the room. 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789 123456789012345678901234567890121234567890123456789012345678901212345678901

Pagina 25-Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza evel as dry
air is heavier...

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Pagina 28 - Dezumidificatoarele desicante - Why / How DST Catalog, brosura Engleza...

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