Application of large temperature difference cooling water system in industrial cooling system

Application of large temperature difference cooling water system in industrial cooling system

In the industrial cooling system, in order to meet the process requirements, small flow materials need to be cooled with a large temperature difference (for example, a certain juice beverage needs to cool the material from 30°C to 5°C, with a temperature difference of 25°C). The traditional method is to require a temperature difference of 5°C for cooling water. In order to improve the competitiveness of our technical solutions, here is a new solution-a large temperature difference cooling water system.

　　The large temperature difference cooling water system is very simple in terms of its essence. The essence is to change the temperature difference between the inlet and outlet of the cooling water, changing the currently commonly used 5℃ temperature difference to 8~10℃ temperature difference. Why did this change? What are the advantages of doing this? The following explains from the aspects of process characteristics, working principles, system differences, and system advantages.

　　 1. Process characteristics

　　 1. The material flow rate is relatively small compared with the cooling water, the output is from several tons/hour to dozens of tons/hour;

　　 2. The material temperature difference is large, exceeding 10 degrees;

　　 2. System differences

　　 Compare 5℃ temperature difference cooling water system and 10℃ temperature difference cooling water system, the difference between the two:

　　1. The configuration, structure and electrical control principle of chillers for 0℃ cooling water system are different, and the total input power is reduced;

　　2, 10℃ cooling water system supporting chilled water pump, process water pump flow decreases, lift increases, power decreases;

　　 3, 10℃ cooling water system chilled water pipes, process water pipe specifications reduced;

　　 The heat exchange area of the user's heat exchanger in the cooling water system at 4 and 10°C is increased;

　　 3. System advantages

　　 1, 0℃ cooling water system chiller unit adopts two-stage refrigeration mode, the first-stage refrigeration system has high evaporation temperature and high cooling efficiency. Under the same cooling capacity, the input power is reduced by 7.5%;

　　 2, 0℃ cooling water system supporting chilled water pumps and process water pumps are generally reduced compared to 5 degrees cooling water, the input power is reduced to about 60%, and the cost of the pump is reduced.

　　 The flow rate of the cooling water system at 3 and 10℃ is reduced by half, so the specifications of engineering materials such as chilled water pipes, process water pipes, valves, and thermal insulation materials are reduced by one level. The project cost is reduced by 20~30%.

　　 4, 10 ℃ cooling water system due to the decrease of the cooling water flow, the user needs to increase the heat exchange area of the heat exchanger to ensure the heat exchange effect, and the increased cost of the heat exchanger is about 1.2 times the principle;

　　 4. Conclusions after comprehensive comparison:

　　Using a 10℃ cooling water system can achieve the following effects:

　　 1. Reduced to 10-25% of the overall cost;

　　 2. Reduce operating costs by more than 20%;

　　 Five, matters needing attention

　　 1. Adopt a large temperature difference cooling system. Scope of application: applicable to materials whose temperature exceeds 5 degrees;

　　 2. When a large temperature difference cooling system is used, the heat exchange amount of the material heat exchange equipment needs to be checked.