Air-Cooled Chiller

Treated Fresh Air Units (TFA)

Treated Fresh Air (TFA) refers to a specialized type of Air Handling Unit (AHU) used in modern Heating, Ventilation, and Air Conditioning (HVAC) systems. Designed to enhance indoor air quality, TFA units introduce filtered and conditioned fresh air from the outdoors into interior spaces. Often categorized under Direct Expansion (DX) units due to their use of refrigerant-based cooling, these systems are commonly installed in lobbies, corridors, and other common areas where moderate temperature control is required. Typically, they maintain an indoor temperature about 4°C to 6°C lower than the ambient outdoor temperature, ensuring a comfortable yet energy-efficient environment.

TFA units offer several key advantages, including improved indoor air quality by effectively filtering out pollutants, allergens, and odors. Their integration of DX technology allows for efficient cooling, helping reduce overall energy consumption. These systems contribute significantly to occupant comfort, especially in high-traffic public spaces, by maintaining fresh and healthy air circulation. Additionally, their design promotes cost-effective operation, making them a reliable choice for sustainable building management. Overall, Treated Fresh Air units provide a balanced solution that supports both environmental performance and occupant well-being.

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Frequently Asked Question

Treated Fresh Air Units (TFA) are specialized air-handling systems that bring in outdoor fresh air, filter it, and condition it (usually cooling, sometimes dehumidifying), before supplying it into interior spaces. Unlike standard ventilation, TFAs deliver conditioned fresh air, often via direct expansion (DX) technology. This kind of unit is commonly installed in lobbies, corridors, and other common areas where comfort, fresh air intake, and moderate temperature control are required.

What does “DX (Direct Expansion)” mean in a TFA unit?

It means the unit uses refrigerant in a cooling coil (via compressors) to cool (and sometimes dehumidify) the fresh outdoor air directly, instead of using chilled water from a central plant.

How much cooler will the TFA make the air compared to outside?

Typically around 4-6°C cooler than the ambient air, depending on load, climate, and design.

What kind of filtration do TFA units use?

Usually medium-to-high efficiency air filters. Depending on the environment (e.g. pollution levels, allergens, odor control), filter quality might be upgraded to specialized filters (HEPA, activated carbon etc.).

Can TFA units be used in all climates?

Yes, with design adjustments. In hot humid climates, more dehumidification may be needed; in dusty or polluted climates, better filtration; also insulation or weather-proofing in extreme conditions.

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