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Comparison of heat recovery of heat pipe, runner and plate heat exchanger(1)

Views:2     Author:Site Editor     Publish Time: 2020-06-23      Origin:Site

Comparison of heat recovery of heat pipe, runner and plate heat exchanger

     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, high air tightness and high thermal insulation affect people's work and living environment, and people's requirements for indoor air quality The higher the future, the eager to have a healthy and comfortable indoor environment, especially after the attack of SARS, people pay more and more attention to indoor air quality, and put forward higher requirements for the introduction of outdoor fresh air ventilation, but ventilation will inevitably With the loss of energy, the introduction of fresh air needs to consume more energy. Therefore, it is necessary to consider an effective energy-saving method to exchange heat between the fresh air and the exhaust air through the heat recovery device. The heat exchanger is a key device for air conditioning and waste heat recovery.

1. Rotary heat exchanger

     The surface of the runner heat exchanger is honeycomb, coated with a layer of adsorbent material as a desiccant. Place the runner between the air ducts to divide it into two parts. The exhaust air from the air-conditioned room is discharged from one side, and outdoor air enters from the other side in the opposite direction. In order to increase the heat exchange area, the wheels rotate slowly (10-12 rpm). Half of the wheel absorbs stored heat from the hotter air, and when it rotates to the other side, it releases the heat and transfers the heat. The desiccant attached to the surface condenses the moisture from the high-humidity air stream and absorbs it through the desiccant. When it is rotated to the other side, the moisture is released into the low-humidity air stream. This process transfers latent heat.

    Separator plates are provided on both sides of the rotating body of the heat exchanger, so that the fresh air and the exhaust air flow in the opposite direction. The runner chip is made of special paper or aluminum foil, and its surface is coated with a hygroscopic coating to form a carrier for heat and moisture exchange. It rotates at a speed of 10-12r/min and collects the cold and heat in the exhaust air first In the regenerator (rotor core), it is then transferred to the fresh air. The air passes through the regenerator at a flow rate of 2.5-3.5m/s, and the heat and moisture are exchanged by the temperature difference between the fresh air and the exhaust air and the partial pressure difference of the steam. Therefore, both sensible heat and latent heat can be recovered.

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