Variable Air Volume (VAV) System Explained - Components, Working Principle, Pros & Cons

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Variable Air Volume (VAV) system is a type of air distribution in HVAC. It is made up of several components, not just the VAV Boxes. The VAV components work together as a system to improve the energy efficiency of the air conditioning system. However, there are also times where a VAV system might not be a good idea. This video explain it all.
0:00 Introduction
0:24 What is VAV
1:10 VAV Box
5:10 Thermostat, VSD & DPS
6:39 VAV Working Diagram
10:46 Why VAV
12:55 Disadvantages of VAV
15:51 Conclusion
More on the subjects mentioned in this video:
Article on VAV: aircondlounge.com/what-is-vav...
Bio: Yu worked as a professional in the HVAC industry for more than 7 years. He is an engineer who has a passion for blogging and content creating. Ever since he created aircondlounge website and RU-vid channel, Yu has helped hundreds of homeowners and engineers on HVAC related matters.
If you find this video helpful, please like and consider subscribing to my RU-vid channel. I'll greatly appreciate that. Thank you.

Опубликовано:

11 июл 2024

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Комментарии : 19

@jasmineyiu8219 19 дней назад

clear and informative !

@aircondlounge 19 дней назад

Great!

@alokkumardubey1982 Год назад

This vedio is very helpful for HVAC technician .Hey I am Indian

@goldennuggetinfo8468 9 месяцев назад

Great explanation!

@katuraysalad 2 месяца назад

Thank you for this informative video ❤

@aircondlounge 2 месяца назад

Anytime

@saravanakumar54 11 месяцев назад

Very youthful information thanks

@aircondlounge 11 месяцев назад

No problem

@user-sg6qv8gn7q 8 месяцев назад

Good

@g_glop 11 дней назад

are there VAV boxes with Larner-Johnson type valves? partially open buterffly valves produce turbulence at high CFM which is not only noisy but also increases pumping losses

@aircondlounge 11 дней назад

I have not seen such a VAV damper, mostly are very basic ones. Designing

@JaykeSapalaran-iq3qs 10 месяцев назад

Great video information 👍❤ Thank you for sharing your knowledge and experience 🇵🇭🫡

@aircontrolserviceshotsprin1707 9 месяцев назад

What about series VAV with fan powered box how to set up

@alexekwueme7477 2 дня назад

Thank you for the video. Please I want to know what happens when the big room temperature is higher than the setpoint; say 25°c, the medium room is 22°c, and the small room is 18°c. How does the AHU and the BMS handle this situation?

@aircondlounge День назад

I think in this case should recalibrate the VAV airflow in those rooms. The big room needs more airflow while reducing the airflow in the small room.

@alexekwueme7477 День назад

@@aircondloungeso that means each duct that connects each room must have a VAV?

@aircondlounge День назад

@alexekwueme7477 It depends. If each room needs about 1500 CFM, then it is likely that every room needs a VAV box. Otherwise, 2-4 rooms can share one VAV box. Each room will then rely on the radial or OBD on their diffuser to adjust to their required airflow (eg: 150, 250, 700, etc.). If multiple rooms are sharing one VAV box and each room diffuser doesn’t have volume control damper, then small room will indeed be overcooled since majority of the temperature control comes from the big room because the big room contributes more airflow for the control.

@aircondlounge День назад

And the thermostat used to control the VAV is likely located in the big room as well.

@alexekwueme7477 День назад

@@aircondlounge I think each room should have VAV and it's damper plus thermostat for full control of the air in the rooms.