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Boss, low work efficiency and increased energy consumption are really not my problem... As the safety officer of the refrigeration unit, industrial refrigeration engineers should always provide safety guarantees for the operation of the unit and should always be consistent with the work efficiency of the unit. However, in actual work, engineers will inevitably neglect the "care and maintenance" of the unit due to energy and other issues, which may cause the unit to malfunction.: 1. High energy consumption in operation. 2. The system is unstable. 3. Problems such as the outlet temperature of chilled water being too high. And when engineers have worked hard to maintain the unit, the "temperature" of the unit has increased after three to five years of operation, and problems such as reduced efficiency and increased energy consumption have appeared. These problems may not appear in the short term if the unit is maintained again, but the unit will still make the same mistakes in the long run. These problems are essentially caused by aging faults in the entire machine system such as cooling towers, evaporators, condensers, compressors, main boards, and piping systems. Ordinary maintenance cannot effectively control the aging of the unit after long-term operation. If the user wants the unit to maintain good performance in the next operating stage and have better optimization in terms of energy consumption, it is particularly important to upgrade the entire system of the unit. For example,: A certain model of York's screw compressor unit has been running for fifteen years. During the long-term operation of the unit, various aging problems occurred in the compressor, condenser, piping system, main board, etc., which seriously affected the operation of the unit and intensified energy loss. There are two solutions to the above problems: 1. Choosing overhaul to solve the unit's periodic failure may cause another failure during the cycle (the overhaul period is generally 30,000 hours), and energy consumption cannot be effectively optimized. The overhaul cost accounts for about 30% of the unit purchase cost. 2. Select the complete system upgrade of the unit, replace the cooling tower motor, upgrade the Quantum 6 motherboard, Quantum HD system, digital version and analog board, replace the compressor rotor and shaft seal bearings. After the complete unit upgrade, the unit can run for a long time, the unit performance is improved, and the energy consumption is significantly optimized. The unit upgrade cost accounts for about 50% of the purchase cost. When there is no refrigeration unit to purchase yet and the unit needs to run for a long time, which solution will you choose?