An evaporative condenser is a key heat exchange device in a refrigeration system. Its working principle is as follows: Superheated, high-pressure refrigerant gas discharged from the compressor passes through the condenser coils in the evaporative condenser, where the high-temperature gaseous refrigerant exchanges heat with the sprayed water and air outside the coils. Specifically, the gaseous refrigerant enters the coils from the top and gradually condenses into liquid refrigerant from top to bottom. The powerful airflow from the accompanying induced draft fan ensures that the sprayed water completely and evenly covers the surface of the coils, greatly improving the heat exchange effect. The heated sprayed water partially turns into a gaseous state, and the latent heat of vaporization of water carries away a large amount of heat with the help of the airflow. Water droplets in the hot air are trapped by a high-efficiency dehydrator, and the remaining water, having absorbed heat, falls into the PVC water-spraying heat exchange layer, where it is cooled by the flowing air, lowers in temperature, and enters the water tank, where it continues to circulate via a circulating water pump. Moisture evaporated into the air is automatically replenished by a water level regulator.
Heat exchange tubes come in various forms, commonly including hot-dip galvanized carbon steel tubes (further divided into round and elliptical tubes), aluminum alloy tubes, and stainless steel tubes (further divided into 314/316 round tubes and corrugated tubes). Among these, hot-dip galvanized carbon steel evaporative condensers were the earliest type used and hold the largest user base in China, primarily for high-pressure gas condensation and cooling, with an applicable pressure range of 0-30 MPa.
Aluminum alloy evaporative condensers are a newer, energy-saving product suitable for refrigeration refrigerant condensation in ice machines, with an applicable pressure range of 0-5 MPa. Stainless steel evaporative condensers are mainly used in the cooling and condensation processes of corrosive gases in some chemical plants.
The outer shell of refrigeration evaporative condensers is generally made of galvanized sheet with powder coating. This type of sheet has the characteristics of stainless steel: it does not rust, has an attractive appearance, and is easy to process.
