Technical analysis and application practice of Jiangsu Kangshijie cascade chiller unit
1、 Core Technology Architecture
The Jiangsu Kangshijie cascade chiller adopts a binary or ternary cascade refrigeration system, which achieves ultra wide temperature range control from -120 ℃ to+300 ℃ through the coordinated work of high-temperature stage (R404A, etc.) and low-temperature stage (CO ₂, R23, etc.) refrigerants. Its core innovations include:
Optimization of inter stage heat exchange: The high-temperature evaporative condenser provides a cold source for the low-temperature stage, reducing compression ratio and reducing energy consumption by 20% -30% compared to single-stage systems;
• Safety redundancy design: Install anti overpressure devices for expansion vessels and branch liquid supply systems to ensure a continuous operation failure rate of less than 0.5% under -100 ℃ conditions;
• Mixed working fluid technology: The self stacking machine adopts non azeotropic mixed working fluid, and a single compressor can achieve multi-stage stacking, which is suitable for space limited scenarios.
2、 Performance advantages
• Refrigeration capacity: The binary cascade system can reach -105 ℃, and the ternary cascade can be extended to -150 ℃, meeting the stringent requirements of aerospace heat sink testing, etc;
Energy Efficiency Breakthrough: The R404A+CO ₂ combination achieves a COP of 0.60 at -80 ℃, reducing operating costs by 70% -90% compared to liquid nitrogen solutions;
Environmental compatibility: The entire series uses low GWP refrigerants such as R14 and R23, which comply with the EU F-Gas regulations.
3、 Industry application cases
Biopharmaceuticals: Provide a stable environment of -80 ℃ for vaccine freeze-drying process, and increase the retention rate of active ingredients to 99.5%;
Chemical extraction: After adopting a -90 ℃ unit, the oil and gas recovery efficiency of a certain petrochemical enterprise increased by 15%, saving more than 2 million yuan in liquid nitrogen costs annually;
Electronic testing: The 21KW self stacking unit provides a ± 1 ℃ precision controlled cold source for low-temperature reliability testing of chips, supporting a circulating chilled water flow rate of 6m ³/h.
4、 Technological Evolution Direction
Kangshijie is developing an ammonia CO ₂ transcritical cascade system, which achieved a 40% increase in COP under -120 ℃ conditions during the experimental phase, and integrated AI predictive maintenance function, reducing the fault response time to 2 hours.