In the refrigeration system, evaporator, condenser, compressor and throttle valve are the four essential parts in the refrigeration system, among which the evaporator is the equipment for conveying cold capacity. In which the refrigerant absorbs the heat of the object being cooled. Compressor is the heart, playing the role of suction, compression, transport refrigerant steam. The condenser is a device that releases heat. The heat absorbed in the evaporator is transferred to the cooling medium together with the heat transformed by the work of the compressor. The throttle valve plays a role of throttling and reducing the pressure of the refrigerant, and controls and adjusts the amount of refrigerant liquid flowing into the evaporator. The system is divided into two parts: the high pressure side and the low pressure side. In the actual refrigeration system, in addition to the above four large parts, there are often some auxiliary equipment, such as solenoid valve, distributor, dryer, collector, fusible plug, pressure controller and other components, they are set up to improve the economy, reliability and safety of the operation.

According to the form of condensation, the air conditioner can be divided into water cooling and air cooling, and according to the purpose of use, it can be divided into single cooling and refrigeration heating. No matter which type is composed of the following main components.

The necessity of condenser is based on the second law of thermodynamics. According to the second law of thermodynamics, the spontaneous flow direction of heat energy inside a closed system is unidirectional, that is, it can only flow from high heat to low heat, and the microscopic particles carrying heat energy can only change from order to disorder in the microscopic world. Therefore, when a heat engine has energy input to do work, energy must also be released downstream. In this way, there will be a thermal energy gap between the upstream and downstream, and the flow of thermal energy will become possible and the cycle will continue.

Therefore, if you want the bearer to do work again, you must first release the heat energy that has not been completely released, and at this time, you need to use the condenser. If the surrounding heat energy is higher than the temperature in the condenser, work must be done to cool the condenser (generally using a compressor). The condensed fluid returns to a state of high order and low heat energy and can do work again.

The choice of condenser includes the choice of form and model, and determines the flow rate and resistance of cooling water or air flowing through the condenser. The selection of condenser type should consider the local water source, water temperature, climate conditions, as well as the total cooling capacity of the refrigeration system and the layout requirements of the refrigeration room. On the premise of determining the condenser type, the heat transfer area of the condenser is calculated according to the condensing load and the heat load per unit area of the condenser, so as to select the specific condenser model.