五、冷媒的性质热泵依靠某种物质状态变化产生热量,这种物质叫做冷媒。要求它具有下述性质: 1.在常温下,冷媒蒸发压力比大气压力高,以免运行时空气进入热泵使压缩力提高,引起腐蚀和润滑恶化。 2.冷凝压力低,设备轻便。 3.汽化潜热大,液体比热小。 V. The nature of the refrigerant The heat pump relies on a change in the state of matter to produce heat. This material is called a refrigerant. It is required to have the following properties: 1. At room temperature, the refrigerant vapor pressure is higher than the atmospheric pressure so as not to increase the compressive force when the air enters the heat pump during operation, resulting in deterioration of the corrosion and lubrication. 2. Low condensing pressure and light equipment. 3. The latent heat of vaporization is large and the specific heat of the liquid is small.