How to cool the central air conditioner in hotel rooms?

Working principle of central air conditioning: air conditioning refrigeration: air conditioning system has a heat-absorbing medium-refrigerant (refrigerant). After being throttled by the expansion valve, the refrigerant evaporates and gasifies in the indoor unit (evaporator). The fan of the indoor unit blows cold air into the room to absorb the heat energy in the indoor air. The refrigerant returns to the suction end of the compressor through the pipeline, and the temperature of the refrigerant is increased through the compression of the compressor. In the conversion process, the refrigerant is converted from a vaporized state to a liquefied state through the outdoor unit (condenser).

Air-conditioning heating: the system directly enters the high-temperature and high-pressure liquid compressed by the compressor into the condenser of the indoor unit (the indoor unit changes from refrigeration to heating, and the function changes from evaporator to condenser) through the conversion of the electric four-way valve, and releases a lot of heat to the room through the fan to absorb the cold air in the room; System refrigerant is throttled by expansion valve, and then converted from liquid to gas by outdoor evaporator. The cold air sucked by the indoor unit is discharged to the outside through the outdoor evaporator and fan, and the refrigerant returns to the suction end of the compressor through the pipeline. Through repeated circulation, the purpose of heating is achieved.