Working principle of fresh air unit manufacturer introduction of fresh air unit

do you know what a fresh air unit is? Fresh air unit is a kind of conditioning equipment that provides fresh air. Its main functions are dust removal, dehumidification, cooling and purifying indoor air, and importing fresh outdoor air into the room. So do you understand the working principle of the fresh air unit? At present, which fresh air unit manufacturers are producing this fresh air unit on the market? The following small series will introduce it in detail for everyone.

introduction of fresh air unit

fresh air unit is an air conditioning device that provides fresh air. Functionally, it can achieve constant temperature and humidity or simply provide fresh air according to the requirements of the use environment. The working principle is that fresh air is taken out of the room and sent to the room by a fan after dust removal, dehumidification (or humidification), temperature reduction (or temperature increase), and the original air in the room is replaced when it enters the indoor space. Of course, the functions mentioned above depend on the requirements of the use environment, and the more complete the functions, the higher the cost.

in order to ensure the indoor air quality, the indoor space is equipped with a centralized fresh air system, and the host that supplies and processes fresh air is called a fresh air unit.

Working principle of fresh air unit

1. The temperature control system of fresh air unit is composed of a proportional-integral temperature controller, a temperature sensor installed in the air supply pipe and an electric regulating valve. The function of the controller is to send the air supply temperature detected by the temperature sensor in the air supply duct to the temperature controller for comparison with the temperature set by the controller, and according to the result of PI operation, the temperature controller gives an open/close signal to the electric regulating valve, so as to keep the air supply temperature in the required range.

2. The electric regulating valve is interlocked with the fan to ensure that the wind valve is closed at the same time when the power supply of the fan is cut off. The electric control valve can also be linked with the fan (as shown in the dotted box in the figure), and the electric control valve is closed when the fan cuts off the power supply. The two interlocking line connection modes in the above picture are respectively used for power-off reset equipment and power-off equipment, and users can choose according to the specific situation. (The hot water valve position can be kept at the required opening through the travel limiter in the occasion with anti-freezing requirements).

3. When refrigeration is needed, the thermostat is placed in refrigeration mode. When the temperature measured by the sensor reaches or is lower than the set temperature, the thermostat gives a valve closing signal to the electric valve, and the valve closing contact of the electric valve is connected to close the valve. If the measured temperature does not reach the set temperature, the thermostat gives the electric valve a valve opening signal, and the valve opening contact of the electric valve is connected to open the valve. When heating is needed, the thermostat is placed in the heating mode. When the temperature measured by the sensor reaches or is higher than the set temperature, the thermostat gives the electric valve a valve closing signal, and the valve closing contact of the electric valve is connected to close the valve. If the measured temperature does not reach the set temperature, the thermostat gives the electric valve a valve opening signal, and the valve opening contact of the electric valve is connected to open the valve.

4. When the filter screen is blocked or exceeds the specified value, the switch signal given by the differential pressure switch.

5. When the temperature of the coil is too low, the low-temperature antifreezing switch gives a switch signal, and the fan stops running to prevent the coil from freezing and cracking.

manufacturer introduction of fresh air units

1. Guangdong Westinghouse Kangda Air Conditioning Co., Ltd., Westinghouse Kangda, fresh air ventilator, all-heat fresh air ventilation combined air conditioning units, which are professionally customized and can be used in schools, hotels, offices and other areas. The starting batch is at least five sets, and the market price is 44. yuan/set.

2. Shenzhen Jinhuali Refrigeration Equipment Co., Ltd. provides customized processing services, supplying ceiling fresh air units and ceiling air cabinets in Shenzhen, with the temperature controlled at 18-25 degrees Celsius, mainly using regional medicine. The starting batch is at least four sets, and the market price is 46. yuan/set.

3. Jingjiang Qixing Air Conditioning Equipment Manufacturing Co., Ltd. supplies fresh air units and provides customized processing. The shell of the units is made of iron shell fans. The starting batch is at least five sets, and the market price is 16. yuan/set.

4. Xiamen Zhonghui Air Conditioning Co., Ltd., ceiling-mounted fresh air unit, ceiling-mounted fresh air unit with heat recovery and heat recovery fresh air system, provides customized processing, and its main functions are ventilation, energy recovery, refrigeration and heating. The starting batch is at least four sets, and the market price is 49. yuan/set.

5. Shanghai Hengbiao Air Conditioning Equipment Co., Ltd., outdoor fresh air ventilation unit and high static pressure air duct unit, can be customized, with a cooling capacity of 3. The starting batch is at least eight sets, and the market price is 998. yuan/set.