humidification
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Transcript of humidification
1
Welcome
Luwa Textile Air Engineering 1
PRESENTATION ON HUMIDIFICATION PLANT
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WHAT IS HUMIDITY ? Relative humidity is a term used to describe the amount of watervapor in a mixture of air and water vapor.
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Comfort cooling Humidification Air Conditioning Humidification
- For application without dust pollution
- e.g for Process house
- Standard system for Textile Industry in India
Conditions (for example):
Outside temp: 42 ºCSupply air temp: 26 ºC
(at WBT 25 ºC)
Conditions:Room temperature: depending on Outside WBTRoom humidity: Setpoint ± 2.5
rh
Conditions:Room temperature: Setpoint ± 1.0 ºC
Room humidity: Setpoint ± 2.5 rh
- For special production processes, or for lower
Room temperatures
WHAT IS HUMIDIFICATION PLANT?
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WHY IS IT NEEDED ?
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Absolute Humidity [g/kg]Rel. Humidity
[%]
Temperature [°C]
WHY IS IT NEEDED ?
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•Role of Temperature and Humidity is very vital to achieve desired output from the spinning mills••Effect of moisture on Cotton fibre properties -Dimensions, weight, tensile strength, elastic recovery, electrical resistance, rigidity etc.. ••If a dry textile material is placed in a room with a particular set of ambient conditions, it absorbs moisture and in course of time, attains equilibrium. •
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• Strength of COTTON goes up when R.H.% goes up •· Strength of VISCOSE goes down when R.H.% goes up •· Elongation %ge goes up with increased R.H.% for most textile fibres •· the tendency for generation of static electricity due to friction decreases as RH goes up •· At higher levels of RH , there is also a tendency of the fibres to stick together •Temparature alone does not have a great effect on the fibres. However the temperature dictates the amount of moisture the air will hold in suspension and , therefore, temperature and humidity must be considered together. •••••
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Influence of the relative humidity on the breaking force of yarns
-30
-25
-20
-15
-10
-5
0
5
10
15
20
40 45 50 55 60 65 70 75 80 85 90 RH%
Dev
iati
on
of
the
forc
e [%
]
Cotton Wool / Silk Acetate Viscose Linen Polyamide Polyester
Important conditions in Textile Processes
Influence of rel. humidity on breaking force of yarns
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Importance of climatic conditions in the textile production processes
Re-directing Converting
Roving Ringspinning
Winding Warping
Weaving and Knitting
Fill feeding
Design of supply air system
low induction diffusers uniform conditions
sufficient air changes
Design of return air system
uniform suction
Sources of dust and fiber fly
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Important conditions in Textile ProcessesInfluence of fiber fly
missing humidity
fiber fly
Fiber deposits on machineries
Traveling cleaner
Machinery maintenance
Machinery handling
Pneumafil Suction
Humidification air change rates
Deposits on the yarn
imperfections
Ends down
electro static
+ ++ +
+++ +
++
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Typical outside condition
Required room conditions
± 2.5 % rh
Products and SystemsExample: Auto Control type Humidification plant
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Products and SystemsExample: Control system (2/3)
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STANDARDS FOR H PLANT
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STANDARDS FOR H PLANT
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STANDARDS FOR H PLANT
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AXIAL FLOW FANAXIAL FLOW FAN
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AIR CONTROLING LUWARSAIR CONTROLING LUWARS
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V FILTERSV FILTERS
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ROTARY DRUM FILTERROTARY DRUM FILTER
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ELEMINATORSELEMINATORS
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SPRAY NOZILESSPRAY NOZILES
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LINEAR DIFFUSERS