Principle of Heat Recovery Series Air Conditioning Units

Principle of Heat Recovery Series Air Conditioning Units

With the growth of China's economic strength and the continuous improvement of people's material and cultural living standards; The rapid development of high-rise buildings has affected people's work and living environment with high air tightness and high heat insulation. People's requirements for indoor air quality are also increasing, and they all yearn for a healthy and comfortable indoor environment. Especially after the SARS attack, people are paying more attention to indoor air quality, and have put forward higher requirements for introducing outdoor fresh air for ventilation. However, ventilation inevitably brings energy loss, Introducing fresh air requires more energy consumption, so it is necessary to consider an effective energy-saving method by using a heat recovery device to exchange heat between fresh air and exhaust air. A heat exchanger is a key device for air conditioning and waste heat recovery.

The main forms of heat recovery units include rotary total heat recovery, rotary sensible heat recovery, plate total heat recovery, plate sensible heat recovery, heat pipe heat recovery, and ethylene glycol heat recovery.

Principle and characteristics of heat recovery

I) Wheel heat recovery device, which has a constant/variable speed rotating wheel inside. It is made of aluminum foil or aluminum foil and high-efficiency moisture absorber using high-tech technology, or made of special composite materials. It is assembled in a box that reverses the airflow without interfering with each other, and is driven by a transmission device to drive a belt.

In winter, the enthalpy value of indoor exhaust is higher than that of outdoor fresh air. When the exhaust passes through the impeller, due to energy exchange, the enthalpy value of the impeller increases. When it runs to the fresh air side, it releases energy to the low enthalpy fresh air, causing the fresh air to heat up. In summer, on the contrary, the temperature of fresh air decreases. Due to the continuous rotation of the wheel, the energy of the high-temperature side air is constantly exchanged with the low-temperature side air.

In a fully heated impeller, humidity transfer is also carried out. When there is a pressure difference in the water vapor pressure of the air on both sides, the moisture will be absorbed from the high side through the impeller and released on the low side after rotation, thereby achieving latent heat exchange.

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