The rotary heat exchanger consists of a rotary heat storage body, a driving motor, a controller, and an outer shell

The rotary heat exchanger consists of a rotary heat storage body, a driving motor, a controller, and an outer shell

The shell is divided into two parts and connected to the intake and exhaust ducts respectively. The power of the electric motor is less than 1Kw, and it is installed at the corner and driven by a V-belt to slowly rotate the wheel heat storage body at a speed of about 10r/min. Thus, the heat (or cold) in the exhaust is stored and then transferred to the inlet air. In general, filters should be installed for both the inlet and outlet air. The rotary heat exchanger can be divided into four types due to the different materials of the rotary heat storage body: (1) ET type: made of corrosion-resistant aluminum alloy foil covered with a hygroscopic coating, it has excellent hygroscopic performance and can recover both sensible and latent heat. The total thermal efficiency can reach 70%~90%. (2) RT type: made of pure aluminum foil, with no moisture absorption, mainly used for recovering sensible heat. (3) PT type: made of corrosion-resistant aluminum alloy foil, capable of withstanding high temperatures and conducting sensible heat exchange. Suitable for kitchens, printing and dyeing factories, and special industrial ventilation systems. (4) KT type: made of corrosion-resistant aluminum alloy foil, coated with a plastic layer, with strong corrosion resistance, mainly used for recovering sensible heat. Suitable for electroplating workshops, motor testing rooms, animal breeding rooms, etc. For RT and PT types, when the temperature of the impeller is lower than the dew point temperature of the exhaust air, it can humidify the fresh air.

Figure 1 Rotary wheel type total heat exchanger and exhaust heat recovery system

(a) Schematic diagram of the structure of a rotary full heat exchanger; (b) Heat recovery system

1. Purify the fan-shaped area; 2. Fresh air fan; 3. Exhaust fan

2. The exhaust and fresh air alternate and flow in the opposite direction through the impeller, which has a self-cleaning effect

3. Through speed control, it can adapt to different indoor and outdoor air parameters

4. High recycling efficiency, up to 70%~90%

5. Can be applied to exhaust systems with higher temperatures (not exceeding 80 ℃)

1. The installation is relatively large, occupying a lot of building area and space

2. Fixed connection position and poor flexibility in piping

3. With transmission equipment, it needs to consume power on its own

4. Significant pressure loss

5. There is a small amount of leakage, which cannot completely avoid cross contamination

2.2 Plate fin total heat exchanger and heat recovery system.

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