How Fan Coils Work in HVAC Systems

Learn How Fan Coils Work in HVAC Systems using Chilled Water or Heating Hot Water Coils. See how Vertical Stacked Fan Coils are used in High-Rise Hotels, Apartments and Dorms. Learn where Horizontal Fan Coils are used and when to use a Dedicated Outside Air System.
Fan coils are available with 2 Pipe or 4 Pipe Systems. Learn the difference between a blow through and a draw through fan coil.
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[@priscillahon203]

I'm studying for the ARE (architecture licensing exam), and this was a better tutorial than the ones I paid for on Amberbook. Thanks.

[@MEPAcademy]

Good luck on your exam. Thanks for watching.

[@rider2731]

Excellent tutorial. Thank you. I have subscribed and liked.

[@MEPAcademy]

You're Welcome, and Thank You.

[@azfarrazin4552]

Very well explanation. Easy to understand

[@MEPAcademy]

Thanks for watching.

[@angxj2451]

Hi, I a bit confused in one building, how many types of hvac equipment is required? Like AHU, FCU, VRF, VAV, FFU, MAU, etc. How do we know which two can be combined or which one is needed in that specific building?

[@MEPAcademy]

The examples are not for one building, but the different system layouts available using fan coils.

[@angxj2451]

@@MEPAcademy Hi, thanks for reply. So for one building, how to determine which is needed?

[@nimbo9492]

Hi, what is really the determining factor on what to use in building hvac systems? Like here you are using fan coils per zone, but at the same time, we could also use central AHU with VAVs, or chilled beams, for each zone. I guess every design has pros and cons.

[@MEPAcademy]

You're correct, every project needs to be reviewed for the best system based on the type of building, geographical location, space constraints, space use, hours of operation, utility cost (electrical, gas & water), future expansion capabilities, etc.

[@dannysoryal1841]

What's the average hot water temperature entering the coil?

[@MEPAcademy]

Depending on the type of boiler this could change. if using a Condensing type boiler you'll want to keep the temperature close to 140 F (60 C) to maintain a 20 F (11 C) delta-t, as the return water should be 120-130 F (48-54 C). Lower Delta-T's will require a slightly larger heat transfer surfaces in the fan coils. Older systems were designed with 180 F (82 C) supply temperatures in order to avoid condensation.

[@muhammadibrar4515]

Hii...brother can i ask question? What is the material of Chilled water pipe and hot water pipe?

[@MEPAcademy]

Smaller sizes are often in copper, while larger sizes can be installed using carbon steel pipe.

[@isaiahisrael421]

If you are to drop suction pressure of any refrigeration system, what happens to the discharge pressure

[@MEPAcademy]

With low suction pressure the compressor will not pump much refrigerant and the system will starve for refrigerant. The discharge pressure will drop from a lack of refrigerant being compressed through the compressor.

[@yousefaboshadyzero]

I don't understand why using doas unit with coiling coil to remove latent and sensible load , but i can design my fan coil to handel it by entering the outdoor condition and amount of ventilation air from ashrae 62.1????

[@MEPAcademy]

Good question. There are many benefits to using a DOAS unit. 1) Improved Indoor Air Quality. 2) Decoupling Ventilation and Conditioning. The DOAS can focus on optimal efficiency by delivering the required amount of ventilation air, while the FCU can focus on conditioning the indoor air, which might have different temperature and humidity needs. 3) Humidity Control. Fan Coils might not be as effective at controlling humidity in humid climates. 4) Energy Efficiency. DOAS units are designed to be energy efficient. They can use Heat Recovery devices to pre-condition the outside air using exhaust air, reducing the load on the FCU's. 5) Noise Reduction. With the DOAS being located outdoors or in a separate mechanical room, they can contribute to reduced indoor noise levels compared to having larger air handling units inside the conditioned space. These are a few of the reasons a DOAS might be beneficial for a project, but each project needs to be evaluated for the specific conditions surrounding the design parameters.

[@isaiahisrael421]

What kind of thin draws (pulls ) air through coils

[@MEPAcademy]

Sorry what do you mean by a thin? There are two type of fan arrangements. The fan can either blow air through the coil, or it can pull the air through the coil. The fan is located before the coil or after the coil. These are the two most common forms of fan arrangements.