制冷原理
Principle of refrigeration
液体汽化制冷是利用液体汽化时的吸热、冷凝时的放热效应来实现制冷的。液体汽化形成蒸汽。当液体（制冷工质）处在密闭的容器中时，此容器中除了液体及液体本身所产生的蒸汽外，不存在其他任何气体，液体和蒸汽将在某一压力下达到平衡，此时的汽体称为饱和蒸汽，压力称为饱和压力，温度称为饱和温度。平衡时液体不再汽化，这时如果将一部分蒸汽从容器中抽走，液体必然要继续汽化产生一部分蒸汽来维持这一平衡。 液体汽化时要吸收热量，此热量称为汽化潜热。汽化潜热来自被冷却对象，使被冷却对象变冷。为了使这一过程连续进行，就必须从容器中不断地抽走蒸汽，并使其凝结成液体后再回到容器中去。从容器中抽出的蒸汽如直接冷凝成液体，则所需冷却介质的温度比液体的蒸发温度还要低，我们希望蒸汽的冷凝是在常温下进行，因此需要将蒸汽的压力提高到常温下的饱和压力。
Liquid vaporization refrigeration is based on the heat absorption of liquid vaporization and the exothermic effect of condensation. The liquid vaporizes to form vapor. When the liquid (refrigerant) is in a closed container, there is no other gas except the liquid and the vapor generated by the liquid itself. The liquid and steam will reach equilibrium at a certain pressure. The vapor at this time is called saturated steam, the pressure is called saturation pressure, and the temperature is called saturation temperature. In equilibrium, the liquid will not vaporize any more. At this time, if a part of steam is pumped from the container, the liquid must continue to vaporize to produce a part of steam to maintain this balance. Liquid vaporization to absorb heat, this heat is called latent heat of vaporization. The latent heat of vaporization comes from the object to be cooled and makes it cool. In order to make this process continuous, it is necessary to continuously extract the steam from the container and condense it into liquid before returning to the container. If the steam extracted from the container condenses directly into liquid, the temperature of the cooling medium required is lower than the evaporation temperature of the liquid. We hope that the condensation of the steam is carried out at normal temperature, so it is necessary to increase the steam pressure to the saturation pressure at normal temperature.
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.