The air-cooled refrigeration unit is suitable for medium and small systems with tight water sources in the region; the longer the annual operating hours, the more advantageous the air-cooled refrigeration unit is; the annual comprehensive cost of the air-cooled refrigeration unit is lower than that of the water-cooled system, but water-cooled If the system is managed and the water supply is controlled below 3%, the initial investment of the air-cooled refrigeration unit compared with the water-cooled refrigeration unit is difficult to recover. This article is a comprehensive analysis and comparison of air-cooled/water-cooled refrigeration units, and I hope to be useful to everyone.
1. The water-cooled chiller must be equipped with a cooling tower. For the open cooling circulating water system, since the cooling water absorbs heat, it is in contact with the air, and CO2 escapes into the air. The dissolved oxygen and turbidity in the water increase, resulting in a cooling circulating water system. Big problems: corrosion, scaling, bacterial growth, sludge. If the water quality is not treated, the refrigeration equipment will be seriously damaged, and the heat exchange efficiency will be greatly reduced, resulting in waste of energy. Therefore, it is very important to carry out corrosion inhibition, scale inhibition, sterilization and algae treatment on the water system.
The water-cooled chiller cooling system must be equipped with an electronic water treatment device or a strong magnetic water treatment device. Otherwise, the heat dissipation efficiency is too large. The longer the use time, the worse the system effect. The annual water treatment cost is high, and the effect cannot reach 100. % descaling. The quality of cooling circulating water is the key. The processing of cooling circulating water is divided into physical and chemical methods.
2. Water-cooled/air-cooled chillers can be used on small systems. Most of the large units are water-cooled. The initial investment in water cooling is less than that of air cooling. But with the addition of cooling towers and computer room electronic water treatment equipment, there is no place to go! [This article source refrigeration encyclopedia public number] In addition, for long-term operation, the cooling efficiency of water-cooled units will be relatively reduced, the air cooling is very low small.
3. The air-cooled chiller adopts air cooling mode, which eliminates the cooling tower, cooling water pump and piping system that are essential for the cooling water system, avoids condensation of the condenser, blockage of water pipes, and saves water resources in areas with poor water quality. It is the most economical and simple machine for maintenance and repair of cold water air conditioning equipment.
The air-cooled chiller has a slightly higher one-time investment than the water-cooled chiller, but the annual operating cost is lower than that of the water-cooled chiller. The construction cost of the equipment room is the least in various air-conditioning cold and heat source systems, and the maintenance cost is about water-cooled. Or half of the cost of the boiler [this article source refrigeration encyclopedia public number]. The air-cooled chillers are louder and cooler than water-cooled and can only be installed outdoors. Most of the water-cooled units are installed in the basement.
4. The service life of air-cooled chiller air conditioners is 15-20 years (water-cooled screw machine); the service life of air-cooled chiller air conditioners is 6-11 years.
The COP value represents the energy efficiency ratio of the air conditioner. The water efficiency unit is high in energy efficiency ratio. The higher the cop value, the higher the air conditioning efficiency and the better energy saving. (COP = air conditioning nominal cooling capacity / compression input power) air cooling module COP value 3.44; water cooling screw COP value 5.2.