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Humidifier is a very important part in air humidification-dehumidification desalinization plant for H2O production. Liquid to air rate of flow quantitative relation is optimization is reported for associate degree industrial cooling towers except for associate degree air humidifier it's not self-addressed. The conditions of air from the humidifier are theoretically predicted by FDM with the given inlet conditions, which will be further used in the design calculation of the humidifier. Hot water to airflow rate ratio and inlet hot water temperature is identified as key operating parameters to evaluate the humidifier performance. The maximum and optimal values of mass flow rate ratio of water to air are found to be 2.15 and 1.5 respectively using packing function and Merkel Integral. The height of humidifier is constrained to 1.5 m and the diameter of the humidifier is found as 0.28m. The performance of humidifier and outlet conditions of air are simulated using FDM and compared with experimental results. The results obtained are within an agreeable range of deviation. 
Air humidifier is an important feature in an HDH desalination plant. The present study is focused on design and optimization of a humidifier for a desalination plant by using FDM. The obtained results are compared with experimental observations for different temperatures of hot water. The other components in the plant are a blower, an air preheater and dehumidifier that are not focused in the present work.
Humidifiers area unit ordinarily utilized in homes to alleviate the physical discomforts of dry nose, throat, lips, and skin. The wetness they raise dry air additionally helps alleviate common nuisances brought on by winter heating, like electricity, peeling wallpaper, and cracks in paint and piece of furniture. However, excess wetness will encourage the expansion of biological organisms within the home. These organisms embody mud mites, that area unit microscopic animals that manufacture materials inflicting sensitivity to unit mud, and molds. Recent observations prove that humidifiers will disperse materials, such as microorganisms and minerals, from their water tanks into indoor air. At present, solely restricted info is obtainable on the expansion of microorganisms and also the spread of microorganisms and minerals by home humidifiers. Proper care and cleanup of inaudible and blade humidifiers area unit vital for reducing potential exposures to microorganisms, like bacterium and molds. Microorganisms typically grow in humidifiers that area unit equipped with tanks containing standing water. Breathing mist containing these pollutants has been concerned as inflicting a definite sort of inflammation of the lungs.
Types of Humidifiers and Associated Pollutants
Console humidifiers are incased in cupboards that are designed for floor use. Portable humidifiers are smaller and more readily moved. Central humidifiers are engineered into heating and air-conditioning systems, and moisturize the full house.
The two sorts of humidifiers that typically seem to provide the best dispersions of each microorganisms and minerals are:
• Unbearable, that produce a cool mist by suggests that of unbearable sound vibrations.
• Impeller, or "cool mist," that produces a cool mist by suggests that of a high-speed rotating disk.
Two further sorts of humidifiers will yield growth of microorganisms if they're equipped with a tank that holds standing water, however typically disperse less, if any, of these pollutants into the air.
These are:
• Evaporative, which transmit moisture into the air invisibly by using a fan to blow air through a moistened absorbent material, such as a belt, wick, or filter.
• Steam vaporizers create steam by heating water with an electrical heating element or electrodes. Warm mist humidifiers are those humidifiers in which the steam is cooled before leaving the machine.
It is important to use a humidifier only when required to use the correct moisture setting for existing conditions, and to clean it thoroughly. The possible health effects caused from the dispersal of microorganisms and minerals by home humidifiers are not fully understood. It is important to reduce the potential for personal exposures to these materials by taking some precautions, particularly when using ultrasonic and impeller humidifiers.

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