The working principle of the condenser is that the gas passes through a long tube to let the heat escape to the surrounding air. Metals such as copper have strong thermal conductivity and are often used to transport steam. In order to improve the efficiency of the condenser, heat sinks with excellent heat conduction performance are often attached to the pipes to increase the heat dissipation area to accelerate heat dissipation, and air convection is accelerated through the fan to take away heat. The refrigeration principle of the refrigerator is that the compressor compresses the working medium from low temperature and low pressure gas to high temperature and high pressure gas, and then condenses it into a medium temperature and high pressure liquid through the condenser. After throttling by the throttle valve, it becomes a low temperature and low pressure liquid. The liquid substance with low temperature and pressure is sent to the evaporator, where it absorbs heat and evaporates to become the steam with low temperature and pressure, and then is sent to the compressor again to complete the refrigeration cycle.