1. The concept of fan coil unit
A fan coil unit is a common air conditioning equipment that can realize cooling and heating functions. It is composed of fans, heat exchangers, water pumps, control systems, etc.
2. Refrigeration principle
The cooling principle of the fan coil is realized through refrigerant circulation. The refrigerant absorbs heat from the room in the evaporator and turns it into a gas. Then, after being compressed by the compressor, the temperature of the refrigerant becomes high, and then it dissipates heat through the condenser becomes liquid, and finally enters the evaporator through valve control, forming a cycle.
3. Heating principle
The heating principle of the fan coil is realized through water circulation, that is, circulating water is introduced into the coil through a water pump. The circulating water is first heated by the heater, then transferred through the coil, and finally circulated back to the water pump for recirculation, thereby achieving the purpose of heating.
4. Application of fan coil units in air conditioning systems
Fan coil units are mainly used in central air conditioning systems to achieve cooling and heating functions through indoor and outdoor units. Among them, the indoor unit is mainly responsible for introducing circulating water into the coil for heat transfer, while the outdoor unit is responsible for compressing the refrigerant and circulating it to the evaporator for cooling.
In general, the principle of fan coil cooling and heating is realized through refrigerant circulation and water circulation. The refrigerant mainly realizes the cooling function, while the water mainly realizes the heating function. In practical applications, fan coil units have multiple functions such as ventilation, cooling, heating, and dehumidification, and can meet the needs of different indoor environments.