Final Presentation on Humidification

8/8/2019 Final Presentation on Humidification

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Topic :

Humidifiers

Presented To :Respected Engr. Salman Nazir


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Presented By

y Salman Sheikh

y Syed Mustafa Ali

y Saqib Anar

y Ghufran Saeed

y Mohammad Shahbaz Mushtaq


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Topics To be Discuss

y What is Humidification ?

y Types of Humidification

y Key points why humidification needs?

y Terms , Lies inside Humidification


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Contd.

y Details about Humidifiers

y Conclusion


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Humidification

Humidification is the artificial regulation ofhumidity in home environments, industrial

environments, and health care applications such asartificial respiration.


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HumidificationTo be comfortable, people require a certain amount of

ambient humidity -- not too high, and not too low.

Adequate humidification in a manufacturingenvironment stabilizes moisture in wood, paper, and

textiles.

In all environments, humidification reduces fire riskand while making the area feel comfortable.


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Humidification Terms

Absolute humidification is expressed in grams ofmoisture per cubic volume of air

Relative humidification is expressed as a ratio betweenthe amount of moisture currently in the air and the

maximum moisture the air could hold beforecondensation occurs


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Comfortable Range

A typical comfortable level of relative humidification is

between 35% and 50%. Excess humidity can cause thegrowth of mold or fungus. Too little humidity can

cause static discharge or the accumulation ofunwanted dust, contributing to allergies.


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Some important terms to be

discuss before going into the

details ofequipments that are

used for Humidification


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Humidity

Humidityis the amount of water vapor in the air.

Humidity indicates the likelihood of precipitation, dew,or fog. High humidity makes people feel hotter outside

in the summer because it reduces the effectiveness

of sweating to cool the body by reducingthe evaporation of perspiration from the skin.


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Absolute Humidity

Absolute humidity is the quantity of water vapor in a

given volume of air, expressed by weightThe most common units are grams per cubic meter

y More technically, absolute humidity on a volume basisis the mass of dissolved water vapor, mw, per cubic

meter of total moist air, Vnet:yAbsolute humidity ranges from 0 grams per cubic

meter in dry air to 30 grams per cubic meter when thevapor is saturated at 30 C


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SpecificHumidity

Absolute Humidity

Specific humidity is a ratio of weight quantities of water

vapor to dry air, such as 1:200, for example.

Relative humidity is the percentage of water vapor inhow much of it the air, in its current condition of

temperature and pressure, can possibly hold


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Humidity ChartRelative Humidity char twhich shows thecomfortable zone range forhumans and for livingbacterias which are harmfulor good for humans..

Green shaded area is the bestsuitable humidity range forhumans

Orange shaded lines

represents the extremeconditions for humans

Red shaded lines are the endregions .


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Humidifiers


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Humidifiersy Introduction

y Type of Humidifiers

y Performance Analysis

y Suitability (Energy Efficiency)


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Introduction

What Are Humidifiers


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Introduction

Components of Humidifier

Water feed tube

Water inlet valve

Drain pan

Air damper

Air duct


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Introduction

Components of Humidifier

Humidistat

Fan

Evaporator belt

Roller


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Types ofHumidifiers

y EvaporativeHumidifiers

y ImpellerHumidifiers

y UltrasonicHumidifiers

yWarmMistHumidifiers


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Types ofHumidifiers

Evaporative Humidifier ImpellerHumidifier


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Types ofHumidifier

Evaporative Impeller

y Most popular type thatproduces cool mist

y Water blown through wet pador filter through fan

y Dust and bacteria getstrapped on the filter

y

Energy efficienty Keeps germs and dirt from

the environment air

y However needs periodicallycleaning

y Also release cool mist

yUtilizes fan to blow waterthrough a diffuser to producefine droplets

y No filter is used

y Hence is a environment

pollutant humidifier

y Although cheaper than Other


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Types ofHumidifier

Ultrasonic Warmmist


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Types ofHumidifier

Ultra sonic Warmmist

y Most advance type

yHave feature of both cool and

warm humidification

y Use high frequency vibrationsto disperse water into the air

y Hence , the most silent type

of humidifier

y Also called vaporizers

y

Heat the water and expelsteam into the room

y Widely used in homes whenfeeling congestion

y Hence, most suitable in cold

climatey Requires more electricity

y Bacteria production chancesare also larger

y Frequent cleaning require


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Comparison ofhumidifier

Humidifier Vaporizer

y Humidifiers are actually

machines, that are used tomoisten or humidify the airin the house.

y These are normally used incooler climates, when due to

the usage of heater, the air inthe house becomes too dryfor comfort and also, itbecomes very difficult tobreathe.

y Vaporizers also help in

moistening the dry air in thehouse, but vaporizers realizehot vapor into the air

y Vaporizers heat the water andthen release vapors. On the

other hand, humidifiersrelease cool moisture dropletsinto the air


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Contd.

Humidifier Vaporizer

y Humidifiers emits cold

vaporsy humidifier disperses the

harmful natural minerals intothe air

y Whereas on the other hand,

there are chances of mold orbacteria growing

y Vaporizers emits hot vapors

yvaporizer always has warm orboiling water in it

y vaporizers however, thesenatural minerals aredeactivated

y vaporizer kills bacterias andthere is no growth of mold, asboiling of the water kills thebacterias


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Furnace Mounted Humidifier


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Furnace mounted humidifier


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Working principle

The humidifier is a flow-through type

where the water flows through the humidifier and drains

out; or it may be a reservoir type which uses areservoir of water and a rotating drum to introduce themoisture necessary for humidified air.


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Working principle

Flow-through humidifiers may be mounted to the airreturn duct and connect to the hot air supply off the

furnace by using a humidifier supplytakeoffductThe supply takeoff bypass duct diverts some heated airto the humidifier by taking advantage of a naturalpressure differential between the supply and returnsides of the furnace

The warm air absorbs moisture from the evaporator padinside the humidifier and returns to the warm airstream through the cold air return duct and furnace.


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Furnace mounted

humidifier

Components ofHumidifier

Water (to createhumidity)Water Medium (e.g.,Collectionpad)evaporatorBlowing Air (to causeevaporation)

Water Control Valveor FloatHumidistat (controlshumidity setting)


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Components.Contd.

y Water Tap / SupplyLine:A water supply line for thehumidifier is tapped into an existing water pipe source.

y Water Inlet Orifice: The orifice reduces the water flow to

the humidifier inlet valve for economy.y Water Inlet Valve: This valve allows water to flow to the

humidifier based on demand. The valve is usuallyelectrically controlled by a solenoid controlled by thehumidistat. The solenoid is usually low voltage powered by

a transformer mounted to the furnace.y Water Feed Tube: Distributes water to the distribution

trough under the top cover and feeds water to theevaporator pad.


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Components.Contd.

y Evaporator Pad (media): This is the water collectionmedium that holds the water briefly as it is evaporated

to create humidified air.y Drain Pan: Water flows through the evaporator pad

and into the drain pan where it then flows into ahousehold drain.

y AirD

amper /AirDuct: Some models have an air ductfrom the hot air side that supplies air to the humidifier

mounted on the cold air return. If the home hascentral air conditioning, then a damper is required.


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Components ater tap

y First things first and thehumidifier needs water.This will be provided bytapping into an existingcold water supply lineclose to the humidifier.Once tapped, the

flexible copper water linewill run to thehumidifier.


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Components

Water Inlet valve assemblythewater supplyflow

needs to be controlled.

This is done by awater inletorifice andan inlet valveassemblycontrolled byan electric solenoid.

The solenoid iscontrolled bya humidistat (sort oflike a thermostat forhumidity).


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Components

Water Inlet valve assemblyWhen the humidistat says

to increase humidity, thesolenoid opens and

supplies thewater feedtube. When thehumidistat says thehumidity level is good or

when the furnace shutsdown, the solenoid shutsoff, stopping water flowto the humidifier.


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Components

Inlet feed tube and troughThe water inlet feed tube runs

from the water inlet valve tothe top of the humidifier. Itconnects to the top cover(held in place by knurlednuts) and delivers water to a

water distribution troughlocated directly under the topcover.

The water distribution troughallows the water to flowevenly to all portions of themedium, which in this case isthe evaporator panel.


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Components

Evaporator PadThe pad's purpose is to

disperse water evenlywhich facilitatesevaporation and alsocollects any mineraldeposits from the water.After a season of use themetal pad will be coated ina white powder from the

minerals in the water.Although these pads cansometimes be cleaned, it isbest to have them replacedevery heating season.


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Components

Drainy With flow-through type

humidifiers, anyunevaporated water from theevaporator pad runs off intothe drain pan and flowsthrough to a household drain.

y This is a key feature of f lowthrough humidifiers, sinceunlike reservoir humidifiers

(ultrasonic or impeller /drum types) where waterstands for a period of time,flow-through humidifiers willnot allow bacteria to develop


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Components

Humidistaty The humidistat is like a

thermostat. You set athermostat for a specifictemperature and when that

temperature is reached, thefurnace turns off.y Same with ahumidistat.You set it for adesired humidity level(usually 30% to 45%) and

when the humidifier reachesthat level of humidification,the water supply is turned offby the solenoid water valveassembly.


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Benefits ofHumidifier

y Makes air moist, which help relieve cold, cough, fluand hay fever symptoms and keeps lungs more elastic.

y

Susceptibility to infection is reduced drastically, bykeeping the mucus membranes of throat and nasalpassages moist and thus, allowing the tiny hair inboth, to obstruct the dust and bacteria.

y

Relieves and prevents dry, scratchy skin and lips.


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y Reduces static electricity, thus prevents tiny shocksreceived from touching people and certain objects. Theproblem of static electricity occurs generally in winters,

when the air is dry. It can be very annoying, when it chargesdoorknobs and metallic furniture. Static electricity candamage electronic appliances too.

y Helps prevent wooden floor from buckling and separating

by hydrating. It keeps the furniture in good shape as well.y Improves the atmosphere and air quality in home, thus

moisturizing the respiratory system, which is beneficial forasthma sufferers.


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y One very important benefit of using humidifiers in thehouse is that it saves a lot of money on heating bills


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Selection ofthe humidifier

y Size ofthe Humidifier

If you want to humidify your entire home you maywant to consider a whole house humidifier as this willlikely be the easiest solution. But if you live in anapartment or if you only want to use it in certain rooms

you should consider a portable humidifier. You can

either move it around from room to room, whereveryou need it, or you can get a couple to keep in the mainrooms of concern.


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y Type ofHumidifier

There are two basic types of humidifiers, warm misthumidifiers and cool mist humidifiers. Warm misthumidifiers heat the water which kills bacteria andprovides a warm mist. These units typically don't use afilter because of the heat. They can also warm the air a

bit so they are better either during the cold months orin a cooler climate.


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y Cleaning and Maintenance

Before you choose a humidifier it is good to know what

type of cleaning and maintenance will be involvedwith it. The quality and mineral content of your watermay impact the level of necessary cleaning for the unitto run properly for a long time.

Some units require a cleaning every couple of days orevery week. Some units use humidifier filters to helpcontrol mineral build up and bacterial growth.


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y HumidityControl

Humidity levels around 45 percent is best. If thehumidity is too low it can cause issues, but if thehumidity level is too high it can also cause problems.Some humidifiers come with a built-in humidstat tohelp control the humidity level in your home, keeping

it at an ideal level.


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y Noise Level

For some people the noise level isn't a big issue but forothers it may be, especially if it will be used in thebedroom during the night. All units will make a littlesound, but ultrasonic and warm mist humidifiers aregenerally quieter than an evaporative humidifier

because of the fan it uses. Read reviews and look forone that lists low noise if this may be of concern.

Date post:	09-Apr-2018
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Final Presentation on Humidification

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