The heat wheel is a highly efficient heat recovery device, mainly used for heat exchange between hot and cold airflows. Its core principle is to use a low-speed rotating rotor to transfer and recover heat using a heat storage element. The following are the working principles and key features of the heat wheel:
1. Basic working principle
The heat wheel relies on a heat storage element to transfer heat. The rotor rotates at a low speed (usually 1-10 rpm) and is filled with heat storage materials. One part of the rotor passes through the hot airflow, and the other part passes through the cold airflow. When the hot airflow passes through the heat storage element, the element absorbs and stores heat, and the temperature rises; as the rotor rotates, the heat storage element enters the cold airflow area, releases the stored heat, preheats the cold airflow, and reduces its own temperature. The heat exchange cycle of the hot and cold airflows is completed once the rotor rotates one circle.
2. Heat exchange process
Heating period: The heat storage element absorbs heat in the hot airflow and the temperature rises.
Cooling period: The heat storage element releases heat in the cold airflow and the temperature decreases.
Continuous heat exchange: The rotor rotates continuously, so that the cold and hot air flows can obtain continuous heat exchange.
3. Application scenarios
Thermal rotors are widely used in industrial energy conservation, air conditioning systems and chemical production. For example:
In air conditioning systems, thermal rotors are used to recover heat from exhaust air, preheat or precool fresh air, and reduce energy consumption.
In chemical production, thermal rotors are used for evaporation and steam recovery to improve energy utilization efficiency.
4. Advantages
High efficiency and energy saving: By recovering sensible heat and latent heat, energy consumption is significantly reduced.
Continuous operation: The rotor rotates at a low speed to achieve continuous heat exchange between cold and hot air flows.
Versatility: Suitable for air flow exchange at different temperatures and humidities, with a wide range of application scenarios.
5. Technical details
Speed control: The speed of the rotor is usually 1~10 rpm to ensure the efficiency and stability of heat exchange.
Heat storage material: Commonly used heat storage materials include alumina, silica gel and molecular sieves, which have good heat absorption and heat release properties.