There are different sizes and types of Air Handling Units. Some will fit in a closet or within a ceiling space, while others will require a mechanical room or will need to be placed on the roof of a building. Within all of them, however, there is at least one fan and one method of conditioning the air.
These are the basic components in an AHU: Fans, Coils, Filters, Heaters, Humidifiers, Dampers, Mixers, and Enthalpy/Desiccant Wheels. There are other fixtures in an AHU for controls purposes, but basically these are the components you will see on most AHUs.
Most air handlers will at least have a set of filters that catch stuff in the air like lint, bugs, paper, or other things so that these objects don’t damage the coils and fan. The filters also prevent objects from being launched out in the air being supplied to the space. These basic filters are usually 2” to 4” thick sometimes exist alone and are simply called “filters”, but in larger AHUs they are usually followed by a thicker set of filters that have the job of actually cleaning the air to a certain degree. When the two sets of filters exist together they are called the Pre Filters and the Final Filters.
AHUs usually have a Cooling Coil that is basically a back-and-forth series of pipes that have metal fins attached to them, and Chilled Water or Low Pressure Refrigerant passes through the pipes. As the air passes over the pipes and between the fins it gets cooled down by a measurable amount.
Sometimes there is a heating coil that is similar to the cooling coil, but with hot water passing through it instead of chilled water or cold refrigerant. There are also other ways of heating the air such as electric heating elements, direct-fired gas heater or indirect-fired gas heater. Some even have steam heaters in them. They can also be located before or after the Cooling Coil depending on the engineer’s design and intention.
There are AHUs that have humidifiers in them. They disperse steam into the air stream helping to maintain a healthy and comfortable amount of humidity in the areas of the building that it serves. Usually this steam is created by a massive boiler somewhere on the property, but there are several different ways to create steam for use in an AHU.
Dampers are common in larger AHUs, and can be opened or closed to allow differing amounts of air to pass into and out from certain openings. Sometimes the amount of Outside Air will vary, the amount of Return Air entering the unit will vary, or sometimes the AHU will be working in tandem with another unit and will need to close itself off from the airstream.
AHUs may also use a Mixing Device if there is a large amount of Outside Air (OA) coming into the unit. The untreated Outside Air (OA) will be mixed with the Return Air (RA) before making it to the coils so that the air entering into the coil is the same temperature all over the entire face of the coil, instead of, for example, the left half seeing the return air and the right half seeing the outside air. An unbalanced load on the coil will cause the coil to produce unwanted results.
Sometimes Air Handling Units that treat outside air will use an Enthalpy Wheel. This potentially monstrous wheel is very successful in recovering heat and humidity from air that is being exhausted out into the outdoors and putting it into the Outside Air that has entered into the AHU. Sometimes engineers and manufacturers will refer to these wheels as Desiccant Wheels.
These are the basic components in an AHU: Fans, Coils, Filters, Heaters, Humidifiers, Dampers, Mixers, and Enthalpy/Desiccant Wheels. There are other fixtures in an AHU for controls purposes, but basically these are the components you will see on most AHUs.
Related uscgmp link:
i would like to know about pore size of inlet and outlet filters in AHU sir
i would like to know about pore size of inlet and outlet filters in AHU sir
i would like to know about pore size of inlet and outlet filters in AHU sir
Filter sequence G-4 :10 micron, F-6:5 micron, F-9: 3 micron installed in AHU and H-13 HEPA filters :0.3 micron installed terminally
Filter sequence G-4 :10 micron, F-6:5 micron, F-9: 3 micron installed in AHU and H-13 HEPA filters :0.3 micron installed terminally
What is H14
What is H14
Very useful article for designers but for deeper understanding read “The math that every designer needs to know“. It helped me very much, hope it will be useful for you too!
Very useful article for designers but for deeper understanding read “The math that every designer needs to know“. It helped me very much, hope it will be useful for you too!
Very useful article for designers but for deeper understanding read “The math that every designer needs to know“. It helped me very much, hope it will be useful for you too!
Very useful article for designers but for deeper understanding read “The math that every designer needs to know“. It helped me very much, hope it will be useful for you too!
AC repair Davie service provider fixes the AC the same day and with 100% guaranteed satisfaction.
ac services
AC repair Davie service provider fixes the AC the same day and with 100% guaranteed satisfaction.
ac services
When you will search for an AC repair Davie master, you will discover many Air Conditioner repair organization in the city.http://www.csacservices.com/
When you will search for an AC repair Davie master, you will discover many Air Conditioner repair organization in the city.http://www.csacservices.com/
If you live in Sunrise, you would find that some of the AC repair Sunrise companies offer their services at low prices than others. heating repair
If you live in Sunrise, you would find that some of the AC repair Sunrise companies offer their services at low prices than others. heating repair
If you live in Sunrise, you would find that some of the AC repair Sunrise companies offer their services at low prices than others. heating repair
If you live in Sunrise, you would find that some of the AC repair Sunrise companies offer their services at low prices than others. heating repair
If you live in Sunrise, you would find that some of the AC repair Sunrise companies offer their services at low prices than others. heating repair
However, you might need more than cleaning if the air conditioner does not turn on. Don Belanger
However, you might need more than cleaning if the air conditioner does not turn on. Don Belanger
This article gives the light in which we can observe the reality. This is very nice one and gives indepth information. Thanks for this nice article. ac repair in denver, CO
This article gives the light in which we can observe the reality. This is very nice one and gives indepth information. Thanks for this nice article. ac repair in denver, CO
This article gives the light in which we can observe the reality. This is very nice one and gives indepth information. Thanks for this nice article. ac repair in denver, CO
This article gives the light in which we can observe the reality. This is very nice one and gives indepth information. Thanks for this nice article. ac repair in denver, CO
Thank you very much
Thank you very much
Be sure to hire a good HVAC contractor for your Carrollton, TX air conditioner and heating cooling system, or you may end up paying more in the long run! To begin, in case you're wondering what HVAC truly stands for, it stands for Heating, Ventilation and Cooling. licensed contractors near you
Be sure to hire a good HVAC contractor for your Carrollton, TX air conditioner and heating cooling system, or you may end up paying more in the long run! To begin, in case you're wondering what HVAC truly stands for, it stands for Heating, Ventilation and Cooling. licensed contractors near you
I really appreciate your post and you explain each and every point very well. Thanks for sharing this information. And I’ll love to read your next post too. room humidifier
I really appreciate your post and you explain each and every point very well. Thanks for sharing this information. And I’ll love to read your next post too. room humidifier
I really appreciate your post and you explain each and every point very well. Thanks for sharing this information. And I’ll love to read your next post too. room humidifier
I really appreciate your post and you explain each and every point very well. Thanks for sharing this information. And I’ll love to read your next post too. room humidifier
I really appreciate your post and you explain each and every point very well. Thanks for sharing this information. And I’ll love to read your next post too. room humidifier
Heating, ventilation, and air conditioning (HVAC)
Heating, ventilation, and air conditioning (HVAC)