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Help CenterIntelligent Ice Water System for 3d Fermentation With a Comprehensive Energy Efficiency Ratio Exceeding the Standard
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Background: Many biotechnology companies south of the Great Wall need ice - water systems to maintain normal production in summer. However, the refrigeration energy efficiency ratio of the Freon compression refrigeration electric ice machines they use is relatively low, only about 6.0 - 7.0. After five years of research and development, Hebei Lekai Energy - Saving Technology Co., Ltd. has developed an intelligent ice - water system for fermentation with a comprehensive energy efficiency ratio exceeding 30. It is equivalent to an ice machine with a water production capacity of 1000T/h at a temperature difference of 5℃ and a daily average power consumption of about 195 kWh per hour. This system integrates multiple professional technical forces and has carried out multiple exchanges and collaborative research and development with well - known domestic cooling tower and ice machine manufacturers, enabling fermentation enterprises south of the Great Wall not to move north of the Great Wall due to high refrigeration costs.
Research and development process:
First, determine the set value range of the ice machine's outlet water temperature as 20 - 25℃, the inlet temperature of the ice machine's cooling water as 31℃, the outlet temperature of the ice machine's cooling water as 36℃, the driving temperature difference of the ice machine's evaporator as 5.0℃, and the driving temperature difference of the ice machine's condenser as 5.0℃. Then, cooperate with well - known domestic brand ice machine manufacturers. Through optimizing the structural configuration of the ternary flow variable - frequency centrifugal compressor, optimizing the design of each component in the refrigeration cycle, and increasing the heat exchange area of the ice machine's evaporator and condenser, customize an ice machine with an energy efficiency ratio greater than 15 at full - load operation.
With an ice machine with an energy efficiency ratio greater than 15 at full - load operation, combine the cooling tower, circulating water pump, and ice machine with the energy supply linkage control of the air pump and add an intelligent feature. Then, an ice - water system with a daily average comprehensive energy efficiency ratio greater than 30 can be obtained. For most regions except coastal areas such as Jiangsu and Zhejiang, it is possible to achieve an average comprehensive energy efficiency ratio greater than 40 or even higher in July.
Intelligent measures:
1. Select the corresponding tower type according to 1.1 times the ice - making water volume at a driving temperature difference of 3℃, and intelligently control the replacement of the circulating water in the cooling tower.
2. Set the outlet water temperature of the cooling tower according to the formula: Set value of the ice machine's cooling outlet water temperature = Air wet - bulb temperature × 0.415+15, and automatically adjust the frequency of the cooling tower fan motor to operate in the range of 35 - 50Hz.
3. Adopt the on - off switch control method to maintain the most reasonable number of operating circulating pumps to control the pressure of the circulating (ice) water.
4. Set the outlet water temperature of the ice machine according to the formula: Set value of the ice machine's outlet water temperature = Outlet water temperature of the cooling tower × 0.4+12.9, and automatically adjust the frequency of the ice machine compressor motor to operate in the range of 32 - 50Hz. When the outlet water temperature of the cooling tower is continuously higher than 25.3℃ for 30 minutes, the ice machine will automatically start running, and the fermentation tanks will switch to be driven by circulating ice water; when the outlet water temperature of the cooling tower is continuously lower than 25.3℃ for 30 minutes, the ice machine will automatically stop running.
5. Set the fermentation temperature according to the formula: Set value of the ice machine's evaporation temperature = Outlet water temperature of the ice machine × 0.7+13.5, and automatically adjust the ice - water flow rate of each fermentation tank.
6. Set the upper and lower limits of the fermentation temperature set - point according to the requirements of the strains
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