Table of Contents
What are the components of AHU unit?
The AHU is a large metal box containing separate ventilators for supply and exhaust, heating coil, cooling coil, heating/cooling recovery system, air filter racks or chambers, sound attenuators, mixing chamber, and dampers.
How many types of air handling units are there?
There are three basic types of an air handling unit. When trying to decide on the purchase of custom air products, Houston residents should choose from the following: Terminal units: Include only an air filter, coil and blower. Simple terminal units are often called fan coil units or blower coils.
How do you calculate the capacity of an air handling unit?
In plain English, we’re changing CFM into Cubic Feet per Hour (CFH). Then we calculate the volume of the room by multiplying the room height times the width times the length. Then we simply divide the CFH by the volume of the room.
Where should AHU be placed in building?
They are usually located in the basement, on the roof or on the floors of a building. AHU’s will serve a specified area or zone within a building such as the east side, or floors 1 – 10 or perhaps a single purpose such as just the buildings toilets. Therefore, it’s very common to find multiple AHU’s around a building.
What is a RTU in HVAC?
RTU stands for roof-top unit. All the components, including the coils, compressor, and fan, are packaged into a single unit on the roof. With an air-cooled split HVAC system, for example, the evaporator and fan are installed inside.
What is chiller unit?
What Is a Chiller? An industrial chiller is a refrigeration system used to lower the temperature of machinery, industrial spaces, and process fluids by removing heat from the system and transferring it somewhere else.
What is the function of an air handling unit?
An Air Handling Unit (AHU) is used to re-condition and circulate air as part of a heating, ventilating and air-conditioning system. The basic function of the AHU is to take in outside air, re-condition it and supply it as fresh air to a building.
What does DX mean in HVAC terms?
DX stands for direct expansion cooling. In DX cooling equipment, a refrigerant coil is placed directly in the supply air stream. As the refrigerant evaporates and expands, it removes energy, lowering the temperature of the supply air stream.
What is the principle of chiller?
A chiller works on the principle of vapor compression or vapor absorption. Chillers provide a continuous flow of coolant to the cold side of a process water system at a desired temperature of about 50°F (10°C).
What do you need to know about air handling units?
We’ll look at different examples of typical AHU’s along with animations for components such as dampers, heating and cooling coils, heat wheels, humidifiers, run around coils, heat exchangers and more, to help you learn HVAC engineering. Want more free HVAC courses? Create your free Danfoss Learning profile by clicking here
How does a modular air handling unit work?
Modular AHUs allow users to select individual components housed in modules having consistent construction and cross sections. The user can select the type of casings, fans, filters, coils, and accessories from a variety of different options.
How big is a custom built air handler?
The units sizes range from small modular units of 2000 CFM to large custom built units of 30000 CFM and higher. Larger air handlers that condition 100% outside air, and no re- circulated air are known as makeup air units (MAUs). These are commonly used in places
How is a run around coil used in an air handling unit?
Run around coil – Air handling unit If the supply and extract AHU’s are located in different areas then a common way to recover some of the thermal energy is to use a run around coil. This uses a coil within both supply and return AHU’s which are connected via pipework. A pump circulates water between the two.