humidification

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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