The so-called water-cooled screw unit refers to the heat dissipation of the condenser of the unit through a cooling tower. The heat dissipation of the cooling tower mainly relies on the sensible heat of water, which is relatively small, so a larger amount of water is required and a larger circulating pump is configured. The condenser is generally a shell and tube type, and the inlet and outlet water temperatures of the condenser are usually designed to be 32 ℃/37 ℃. The advantages of this type of unit are that the whole unit leaves the factory, there is no need to fill Freon and refrigeration oil on site, the installation is simple, the initial investment is low, and it is suitable for situations with limited budget and small refrigeration capacity of the unit; The disadvantage is that the unit requires an additional high-power cooling circulation pump, which leads to an overall increase in energy consumption in the machine room. The unit's energy consumption also increases by about 5% due to the increase in condensation temperature. Shell and tube condensers are prone to freezing and cracking of heat exchange tubes when not running in winter and forgetting to drain water.

Evaporative cooling screw unit refers to a unit whose heat dissipation is completed by evaporative cooling. The cooling of evaporative cooling relies on the latent heat of vaporization of water, which is much larger than sensible heat. Therefore, the power of the circulating pump that comes with evaporative cooling is smaller, and the power of the refrigeration room is also smaller. The advantages of this type of unit are mainly energy-saving. Secondly, because the heat exchange tubes of evaporative cooling are usually galvanized carbon steel pipes, they are generally not afraid of freezing. The main disadvantage is that the initial investment is larger than that of water-cooled units, and the pipeline between the unit and evaporative cooling needs to be connected on site (except for integrated units). It is usually recommended to use evaporative cooling units with a motor power of more than 100Kw for the main engine. With more than 250 days of operation per year and 24 hours of operation per day, the initial investment can be saved. Our company can also only charge the price of water-cooled Our company will bear the additional investment and charge a 3-year energy-saving fee.