In the air conditioning design, I chose the fan coil unit plus fresh air system. Do I still need to choose an air conditioning unit? What is the relationship between air conditioning unit and fan tray

In the air conditioning design, I chose the fan coil unit plus fresh air system. Do I still need to choose an air conditioning unit? What is the relationship between air conditioning unit and fan tray? When I am a beginner, please be more specific. Yes, the air conditioning unit refers to the outdoor unit and the fan tray refers to the indoor unit.

Working principle of wind system

The transmission mode of fresh air is replacement, not the internal circulation principle of air conditioning gas and the bad practice of mixing old and new gases. Outdoor fresh air will be automatically sucked into the room through negative pressure, and it will be automatically dedusted and filtered when it enters the room through the fresh air outlet installed in the bedroom, living room or living room window. At the same time, the corresponding indoor pipes are connected to the exhaust ports of several functional rooms, and the circulating system will take away the indoor exhaust gas and concentrate it on the exhaust port to "exhale", but the exhausted exhaust gas will not be recovered, and the new and old air forms circulate well.

Working principle of coil system

The working principle of fan-coil air conditioning system is to make indoor air circulate continuously with the help of fan-coil to cool or heat it through the coil, so as to maintain the required indoor temperature and certain relative humidity.

The cold water or hot water used by the coil is supplied by the central cold source and heat source. At the same time, the fresh air after centralized treatment in fresh air air-conditioned rooms is sent to all air-conditioned rooms through special fresh air pipes to meet the sanitary requirements of air-conditioned rooms.

Compared with the centralized system, the fan-coil air conditioning system has no large air duct, only water pipes and smaller fresh air ducts. It has the advantages of convenient arrangement and installation, small occupation of building space and good independent adjustment. It is widely used in comfortable air conditioners with low temperature and humidity accuracy, many rooms and small rooms, which need independent control.