Tag Archive fresh air system

how does air to air heat exchanger work in fresh air system

An air-to-air heat exchanger in a fresh air system transfers heat between incoming fresh air and outgoing stale air without mixing the two streams. Here’s how it works:

  1. Structure: The exchanger consists of a core with thin, alternating channels or plates, often made of metal or plastic, that separate the incoming and outgoing airflows. These channels allow heat transfer while keeping air streams isolated.
  2. Heat Transfer:
    • In winter, warm indoor air (being exhausted) transfers its heat to the colder incoming fresh air, pre-warming it.
    • In summer, cooler indoor air transfers its "coolness" to the warmer incoming air, pre-cooling it.
    • This process occurs through conduction across the exchanger’s walls, driven by the temperature difference.
  3. Types:
    • Cross-flow: Air streams flow perpendicularly, offering moderate efficiency (50-70%).
    • Counter-flow: Air streams flow in opposite directions, maximizing heat transfer (up to 90% efficiency).
    • Rotary (enthalpy wheel): A rotating wheel absorbs and transfers both heat and moisture, ideal for humidity control.
  4. Benefits:
    • Reduces energy loss by recovering 50-90% of the heat from exhaust air.
    • Maintains indoor air quality by supplying fresh air while minimizing heating/cooling costs.
  5. Operation in Fresh Air System:
    • A fan draws stale air from the building through the exchanger while another fan pulls fresh outdoor air in.
    • The exchanger ensures the incoming air is tempered (closer to indoor temperature) before distribution, reducing the load on HVAC systems.
  6. Moisture Control (in some models):
    • Enthalpy exchangers also transfer moisture, preventing overly dry or humid indoor conditions.

The system ensures ventilation efficiency, energy savings, and comfort by recycling heat while maintaining air quality.

Purify air conditioning fresh air system

Medical treatment, biopharmaceutical and high-end electronic intelligence industries have emerged as the country's large-scale industrial strategy, and these industries cannot be separated from the application of purification systems. Because of the particularity of the purification system, the introduction of fresh air and the discharge of some indoor air are realized by power, so the demand for energy is fixed. In the system without new and exhaust energy recovery devices, fresh air will consume a lot of energy, while the energy in exhaust air will be wasted. If the energy in exhaust air can be recovered and the fresh air can be pre-cooled or preheated, the waste of resources can be reduced to the maximum extent. The system mode of strong delivery and strong exhaust is more conducive to the arrangement and utilization of new and exhaust energy recovery.

In the air conditioning system design of major hospitals, treatment centers and animal laboratories, in order to avoid cross pollution, the distance between new fans and exhaust fans is usually relatively far. Our company can provide liquid circulating energy recovery scheme. This energy recovery method can effectively avoid cross-contamination of fresh and exhaust air, effectively recover the cold heat in exhaust air through liquid circulation, and release the recovered energy into fresh air, so as to achieve the purpose of reducing energy consumption of fresh air. This recovery system can drag one or more modes.

Historical source of fresh air system

As early as 1906, when studying air and human health, Mr. Al, an indoor environment scientist at the British Institute of Natural Environment, found that the index of indoor air was very different from the content of air components in the outdoor natural environment. This change in indoor and outdoor air quality had a great impact on human health. He took the lead in proposing that indoor and outdoor air can reach a relatively close degree through effective ventilation, and that air is the first element of human health. After years of research, he invented the method of forced mechanical ventilation to realize the replacement of indoor and outdoor air, and named it fresh air system.

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