According to the actual need for refrigeration and the […]
According to the actual need for refrigeration and the scale of the cold storage, we know what refrigeration system needs to be selected, so let's briefly explain the choice of refrigeration system.
In terms of cooling capacity: For example, the 20HP Bitzer medium and high temperature compressor 4NCS20.2 has a cooling capacity of 38.6KW and a power of 13.65KW when the evaporating temperature is 0 degrees and the condensation temperature is 50 degrees. The cooling capacity of water cooling is 44.5KW under the same working conditions. The power is 12.1KW. Slightly better than air-cooled units in terms of cooling capacity and power consumption. However, the cooling tower fan power has not been included in the calculation.
From the scope of application: air-cooled refrigeration units are suitable for areas where water sources are tight; the longer the annual operating hours, the more advantageous it is to use air-cooled refrigeration units; the annual comprehensive cost of air-cooled refrigeration units is lower than that of water-cooled systems, but If the water cooling system is well managed and the water supplement is controlled below 3%, the annual cost of the water cooling unit will be lower than that of the air cooling system. The air-cooled chiller adopts the air cooling method, eliminating the need for cooling towers, cooling water pumps and piping systems that are essential for cooling water systems, avoiding condenser fouling and water pipe blockage in areas with poor water quality, and also saving water resources. Among the current refrigeration equipment products, the most economical and simple model for maintenance and repair
Disadvantages of water-cooled cold storage: For the open-type cooling circulating water system, as the cooling water absorbs heat and contacts the air, CO2 escapes into the air, and the dissolved oxygen and turbidity in the water increase. This causes 4 major problems in the cooling circulating water system: corrosion and condensation. Dirt, bacterial growth and sludge. If the water quality is not treated, it will seriously damage the refrigeration equipment, greatly reduce the heat exchange efficiency, and cause a waste of energy. Therefore, it is very important to perform corrosion inhibition, scale inhibition, sterilization and algae treatment on the system water. The annual water treatment cost is high, and the effect cannot reach 100% descaling. The quality of cooling circulating water is the key. If the water quality is not treated, it will seriously damage the refrigeration equipment and efficiency.