How to Choose Fans for HVAC

August 30, 2023

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Apartments and buildings need to install ventilation systems to help control temperature and air. One of them is the installation of an HVAC system. How to choose fans for HVAC. Selecting a fan for an HVAC system is one of the most important steps. To make the system effective and suitable for the project, saving installation costs. Let’s find out the details below.

Introduction to HVAC systems

HVAC is an acronym for Heating, Ventilation, and Air Conditioning. Meaning: An HVAC system is a ventilation, heating, and air conditioning system. These include different systems used to circulate air between areas in a building space.

The HVAC system will be responsible for:

Air conditioning, cool in summer
Helps keep the air warm in winter
Air circulation, clean filter, remove dirt, keep the space fresh, clean, and safe for human health.

HVAC systems can control temperature, humidity, and air quality. Provide quality air to the entire indoor space.

USEFUL INFORMATION

The solution to reduce the noise of industrial fans

Types of industrial dust collection systems are popular today

Common types of fans in HVAC systems

Industrial axial fan

Axial fan is one of the most widely used industrial fans today. They are used for ventilation and cooling… suitable for HVAC systems. Axial fans have a simple structure, the impeller is designed around the rotating shaft. The fan has a circular cylindrical or square box design, suitable for airflow and low static pressure. Not suitable for applications with high static pressure airflow resistance.

In particular, axial fans usually have 2 forms as follows:

Tubular Axial Fans

In these fans, the fan blades are enclosed in the duct from the outer tip. This creates a consistent airflow. These fans are used for consistent cooling and even air output.

Bladed Axial Fans

These fans consist of blades/pockets between the blades. This helps direct airflow without creating swirling motion. These fans are ideal for variable flow cooling and ventilation applications.

Centrifugal fan

Centrifugal fans are industrial fans shaped like snails or shells. The propeller is designed with a forward or backward-curved blade shape. Helps create flow, and pressure suitable for use needs. Centrifugal fans are mechanical devices that move air or other gases at an angle relative to the direction of the incoming fluid.

Centrifugal fans are capable of generating high pressure, suitable for harsh operating conditions.

In particular, centrifugal fans usually have the following forms:

Radial blade
Forward-curve
Backward-curve
Airfoil

Details refer here: Types of centrifugal fans

Fan selection factors for HVAC systems

Fans used for HVAC systems need to consider forced ventilation, to ensure the movement of air under pressure. How to choose fans for HVAC. Factors below:

1. Fan Type

Select the type of fan that needs to have the function of moving air from one space to another. They can circulate air, providing effective cooling ventilation. Depending on the needs of the system, you can choose an axial fan or a centrifugal fan.

2. Airflow

Each type of fan has a CRM airflow. Therefore, when knowing the type of fan to use, it is necessary to determine the required airflow. Use the following formula to calculate CFM.

Room Volume = LxWxH CFM = Room Volume ÷ Min/Variation

3. Noise level

Noise level is an important factor when choosing industrial fans for HVAC systems. If the HVAC system is installed in the building, the high noise level in the apartment will affect human activities and activities. Creates discomfort for people.

Therefore, it depends on the project to calculate and choose a fan with the appropriate noise level.

Similarly, we have the following recommended noise levels:

– Hospital: 40-55 db

– School: 35-55 db

– Recording room: 20 – 30 db

– Hostels, hotels: 30 – 55 db

– Mall: 45 – 55 db

– Offices, offices: 25 -40db

– …

Select a fan with a noise level below the permissible level according to each installation location.

4. Static pressure

Choosing a fan for an HVAC system depends on static pressure. Requires the technician to calculate the necessary parameters and select the fan suitable for those parameters.

Above is some information on how to choose fans for HVAC. We have consulted and compiled the above information. Hope to bring readers useful information.