制冷工质将在低温、低压下蒸发，产生冷效应；并在常温、高压下冷凝，向周围环境或冷却介质放出热量。蒸汽在常温、高压下冷凝后变为高压液体，还需要将其压力降低到蒸发压力后才能进入容器。
The refrigerant will evaporate at low temperature and low pressure to produce cooling effect, and condense at normal temperature and high pressure to release heat to surrounding environment or cooling medium. Steam condenses at room temperature and high pressure and becomes high-pressure liquid, and its pressure needs to be reduced to evaporation pressure before entering the container.
液体汽化制冷循环是由工质汽化、蒸汽升压、高压蒸汽冷凝、高压液体降压四个过程组成。
The liquid vaporization refrigeration cycle is composed of four processes: working medium vaporization, steam boosting, high-pressure steam condensation and high-pressure liquid depressurization.
制热原理
Heating principle
压缩机吸入低压气体经过压缩机压缩变成高温高压气体，高温气体通过换热器把水温提高，同时高温气体会冷凝变成液体。液体再进入蒸发器进行蒸发，（蒸发器蒸发的同时也要有换热媒体，根据换热的媒体不同机器的型号结构也不同。常用的有风冷和地源。）液体经过蒸发器后变成低压低温气体，低温气体再次被压缩机吸入进行压缩。就这样循环下去，空调侧循环水就变成45-55度左右的热水了。热水经过管道送到需要采暖的房间，房间安装有风机盘管把热水和空气进行热交换实现制热目的。
The compressor inhales low-pressure gas, which is compressed into high-temperature and high-pressure gas. The high-temperature gas increases the water temperature through the heat exchanger, and the high-temperature gas will condense into liquid. The liquid enters the evaporator to evaporate. (the evaporator must also have heat exchange media when evaporating. According to the different heat exchange media, the model and structure of the machine are different. Air cooling and ground source are commonly used.) After passing through the evaporator, the liquid becomes low-pressure and low-temperature gas, which is inhaled by the compressor again for compression. In this way, the air conditioning side circulating water will become about 45-55 degrees of hot water. The hot water is sent to the room which needs heating through the pipe, and the room is equipped with fan coil unit to exchange the hot water and air to realize the heating purpose.