What are the design requirements for a vertical type air handling unit in a shopping mall?

As a supplier of vertical type air handling units, I've had the privilege of being involved in numerous projects, including those in shopping malls. Shopping malls are complex environments with unique requirements, and designing an appropriate vertical type air handling unit is crucial for ensuring a comfortable and healthy shopping experience. In this blog, I'll delve into the key design requirements for a vertical type air handling unit in a shopping mall.

Airflow and Ventilation Requirements

One of the primary design considerations for a vertical type air handling unit in a shopping mall is the airflow and ventilation requirements. Shopping malls are large spaces with a high volume of people, which means there is a significant demand for fresh air. The air handling unit must be capable of providing sufficient ventilation to remove stale air and introduce fresh outdoor air.

According to the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), the minimum outdoor air ventilation rate for shopping malls is typically around 15 - 20 cubic feet per minute (CFM) per person. However, this rate may need to be adjusted based on factors such as the size of the mall, the number of occupants, and the activities taking place. For example, areas with high foot traffic or areas where food is prepared or consumed may require a higher ventilation rate.

The vertical type air handling unit should be designed to distribute the air evenly throughout the mall. This can be achieved through the use of proper ductwork design and air distribution diffusers. The ductwork should be sized appropriately to minimize pressure losses and ensure that the air reaches all areas of the mall. Additionally, the air distribution diffusers should be selected based on the specific requirements of each area, such as the ceiling height and the desired air pattern.

Temperature and Humidity Control

Maintaining a comfortable temperature and humidity level is essential for the comfort of shoppers and the preservation of merchandise in a shopping mall. The vertical type air handling unit plays a crucial role in achieving this.

The temperature in a shopping mall should be maintained within a narrow range, typically between 68°F - 74°F (20°C - 23°C). This can be achieved through the use of a combination of heating and cooling coils in the air handling unit. The heating coils are used to raise the temperature of the air during the colder months, while the cooling coils are used to lower the temperature during the warmer months.

Humidity control is also important, as excessive humidity can lead to discomfort, mold growth, and damage to merchandise. The relative humidity in a shopping mall should be maintained between 40% - 60%. The air handling unit can be equipped with a humidifier or a dehumidifier to achieve this. A humidifier adds moisture to the air when the humidity is too low, while a dehumidifier removes moisture from the air when the humidity is too high.

Filtration and Air Quality

With a large number of people and various activities taking place in a shopping mall, air quality is a major concern. The vertical type air handling unit should be designed to provide high-quality air filtration to remove dust, pollen, smoke, and other contaminants from the air.

The air handling unit should be equipped with filters of appropriate efficiency. High-efficiency particulate air (HEPA) filters are often used in shopping malls to provide the highest level of filtration. These filters can remove up to 99.97% of particles as small as 0.3 microns. Additionally, the air handling unit can be equipped with activated carbon filters to remove odors and volatile organic compounds (VOCs) from the air.

Regular maintenance of the filters is essential to ensure their effectiveness. The filters should be checked and replaced regularly according to the manufacturer's recommendations. This will not only improve the air quality but also extend the lifespan of the air handling unit.

Noise and Vibration Control

Noise and vibration can be a significant source of discomfort in a shopping mall. The vertical type air handling unit should be designed to operate quietly and minimize vibration.

The fan and motor of the air handling unit are the main sources of noise. To reduce noise, the unit can be equipped with low-noise fans and motors. Additionally, the air handling unit can be installed on vibration isolators to minimize the transmission of vibration to the building structure.

The ductwork should also be designed to minimize noise. This can be achieved through the use of sound-absorbing materials and proper duct layout. For example, the ductwork can be lined with acoustic insulation to reduce the noise generated by the airflow.

Energy Efficiency

Energy efficiency is a key consideration in the design of a vertical type air handling unit for a shopping mall. Shopping malls consume a significant amount of energy for heating, cooling, and ventilation, and an energy-efficient air handling unit can help reduce operating costs and environmental impact.

The air handling unit should be designed with high-efficiency components, such as energy-efficient fans and motors, and heat recovery systems. Heat recovery systems can recover heat from the exhaust air and use it to preheat the incoming outdoor air, reducing the energy required for heating.

Additionally, the air handling unit can be equipped with a variable air volume (VAV) system. A VAV system adjusts the airflow rate based on the actual demand, which can result in significant energy savings.

Space Constraints

Shopping malls often have limited space for the installation of mechanical equipment. The vertical type air handling unit is a popular choice in such situations because it takes up less floor space compared to a Horizontal Type Air Handling Unit.

When designing the vertical type air handling unit, it's important to consider the available space for installation, maintenance, and access. The unit should be designed to be compact and easy to install. It should also be accessible for maintenance and repair, with clear access points for filters, coils, and other components.

Conclusion

Designing a vertical type air handling unit for a shopping mall requires careful consideration of various factors, including airflow and ventilation requirements, temperature and humidity control, filtration and air quality, noise and vibration control, energy efficiency, and space constraints. By meeting these design requirements, the air handling unit can provide a comfortable and healthy shopping environment, while also reducing operating costs and environmental impact.

If you're involved in a shopping mall project and are in need of a high-quality Vertical Type Air Handling Unit, I'd be happy to discuss your specific requirements and provide a customized solution. Contact me to start a procurement discussion and find the best air handling unit for your project.

References

• American Society of Heating, Refrigerating and Air - Conditioning Engineers (ASHRAE). ASHRAE Handbook - HVAC Systems and Equipment.
• Manufacturer's manuals for vertical type air handling units.