Final Presentation on Humidification2003format

7/31/2019 Final Presentation on Humidification2003format

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Topic :Humidifiers

Presented To :Respected Engr. Salman Nazir


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Presented By

Salman Sheikh

Syed Mustafa Ali

Saqib Anar

Ghufran Saeed

Mohammad Shahbaz Mushtaq


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Contd.

Humidifiers

Types of Humidifiers

Comparison of Humidifiers

Benefits of Humidifiers

Measurements to choose best humidifier


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Contd.

Details about Humidifiers

Conclusion


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Humidification

Humidification is the artificial regulation of

humidity in home environments, industrialenvironments, and health care applications such as

artificial 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 cancause static discharge or the accumulation of

unwanted dust, contributing to allergies.


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Some important terms to be

discuss before going into thedetails of equipments 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

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

meter of total moist air, Vnet:Absolute 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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Specific Humidity

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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Humidifiers Introduction

Type of Humidifiers

Performance Analysis

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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Evaporative Humidifiers

Impeller Humidifiers

Ultrasonic Humidifiers

Warm Mist Humidifiers


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Evaporative Humidifier Impeller Humidifier


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Types of Humidifier

Evaporative Impeller

Most popular type thatproduces cool mist

Water blown through wet pador filter through fan

Dust and bacteria getstrapped on the filter

Energy efficient

Keeps germs and dirt fromthe environment air

However needs periodicallycleaning

Also release cool mist

Utilizes fan to blow waterthrough a diffuser to producefine droplets

No filter is used

Hence is a environment

pollutant humidifier Although cheaper than Other


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Types of Humidifier

Ultrasonic Warm mist


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Types of Humidifier

Ultra sonic Warm mist

Most advance type

Have feature of both cool andwarm humidification

Use high frequency vibrationsto disperse water into the air

Hence , the most silent type

of humidifier

Also called vaporizers

Heat the water and expel

steam into the room Widely used in homes when

feeling congestion

Hence, most suitable in coldclimate

Requires more electricity

Bacteria production chancesare also larger

Frequent cleaning require


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Comparison of humidifier

Humidifier Vaporizer

Humidifiers are actuallymachines, that are used to

moisten or humidify the airin the house.

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.

Vaporizers also help inmoistening the dry air in the

house, but vaporizers realizehot vapor into the air

Vaporizers heat the water andthen release vapors. On the

other hand, humidifiersrelease cool moisture dropletsinto the air


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Contd.

Humidifier Vaporizer

Humidifiers emits coldvapors

humidifier disperses theharmful natural minerals intothe air

Whereas on the other hand,

there are chances of mold orbacteria growing

Vaporizers emits hot vapors

vaporizer always has warm orboiling water in it

vaporizers however, thesenatural minerals aredeactivated

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 drainsout; 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 thefurnace by using a humidifier supply takeoff duct

The 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.

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

Water Inlet Orifice: The orifice reduces the water flow to

the humidifier inlet valve for economy. 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. 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.

Evaporator Pad (media): This is the water collectionmedium that holds the water briefly as it is evaporatedto create humidified air.

Drain Pan:Water flows through the evaporator padand into the drain pan where it then flows into ahousehold drain.

Air Damper / Air Duct: Some models have an air ductfrom the hot air side that supplies air to the humidifiermounted on the cold air return. If the home hascentral air conditioning, then a damper is required.


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ComponentsWater tap

First things first and thehumidifier needs water.This will be provided by

tapping 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 inlet orifice 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 orwhen 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 runsfrom 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 Pad The pad's purpose is todisperse water evenly

which facilitatesevaporation and also

collects 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

Drain With flow-through type

humidifiers, anyunevaporated water from theevaporator pad runs off into

the drain pan and f lowsthrough to a household drain.

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

Humidistat The humidistat is like a

thermostat. You set athermostat for a specifictemperature and when that

temperature is reached, thefurnace turns off. Same with a

humidistat. 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 of Humidifier

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

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.

Relieves and prevents dry, scratchy skin and lips.


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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.

Helps prevent wooden floor from buckling and separatingby hydrating. It keeps the furniture in good shape as well.

Improves the atmosphere and air quality in home, thusmoisturizing the respiratory system, which is beneficial forasthma sufferers.


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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 of the humidifier

Size of the Humidifier

If you want to humidify your entire home you may

want 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 roomsyou 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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Type of Humidifier

There are two basic types of humidifiers, warm mist

humidifiers 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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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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Humidity Control

Humidity levels around 45 percent is best. If the

humidity 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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Noise Level

For some people the noise level isn't a big issue but for

others 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.

Final Presentation on Humidification2003format

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