Precision chiller is a refrigeration equipment designed specifically for high-precision temperature control scenarios, widely used in fields such as laser processing, medical equipment, laboratory instruments, semiconductor manufacturing, etc. The core technical requirements need to take into account temperature control accuracy, system stability, energy conservation and environmental protection, as well as safety and reliability. The specific technical requirements are as follows:
1、 Temperature control performance
control accuracy
Temperature range: usually covering 5 ℃~35 ℃ (can be extended to lower or higher temperatures).
Control accuracy: ± 0.1 ℃~± 0.5 ℃ (higher accuracy can be selected according to requirements, such as ± 0.05 ℃).
Stability: The temperature fluctuation during long-term operation does not exceed ± 0.2 ℃ of the set value.
response speed
The time from deviation from the set temperature to recovery of stability is ≤ 5 minutes (during large load changes).
2、 Refrigeration System Technology
compressor
Type: Select high-efficiency scroll, screw or piston compressors with low noise and high reliability characteristics.
Refrigerant: Compliant with environmental standards (such as R410A, R134a), ODP (Ozone Depletion Potential)=0.
heat exchanger
Evaporator/Condenser: Adopting high-efficiency plate heat exchanger or shell and tube design, made of copper or stainless steel, corrosion-resistant.
Heat exchange efficiency: Under standard operating conditions, the heat exchange efficiency is ≥ 95%.
Loop system design
Water pump: Choose a low pulsation, corrosion-resistant shielded pump or magnetic pump, and the flow rate should meet the equipment requirements (such as 10-50L/min).
Pipeline: Stainless steel (304/316) or PVC pipeline is used to reduce pressure loss and corrosion risk.
Water quality monitoring: equipped with conductivity sensors or water quality detection modules to prevent scale or microbial growth.
3、 Control system
control algorithm
Adopting PID control or adaptive fuzzy control algorithm, supporting manual/automatic mode switching.
Equipped with remote monitoring interfaces (such as Modbus RTU, Ethernet, 485 communication).
operating interface
Touch screen display, supporting multiple languages (Chinese/English), can display real-time parameters such as temperature, pressure, water flow, etc.
Historical data recording function (storage time ≥ 1 year), supports USB drive export or cloud upload.
safety protection
Alarm function: temperature exceeding limit, insufficient water flow, compressor overload, high and low pressure abnormalities, etc., supporting SMS/email notifications.
Redundant design: Key components such as compressors and pumps are equipped with backup modules that support automatic switching.
4、 Structure and Design Requirements
Noise and vibration
Noise level ≤ 60dB (A) (at 1 meter), noise reduction measures such as soundproof cotton and shock-absorbing pads are used.
Vibration control: Rubber shock absorbers are used between the compressor and the frame to reduce vibration transmission.
environmental adaptability
Working temperature range: -10 ℃~45 ℃ (air-cooled type), or supports water-cooled heat dissipation (suitable for high temperature environments).
Protection level: IP55 (indoor type) or higher (outdoor type needs to consider rainproof design).
Materials and Processes
Internal contact with coolant components: Made of stainless steel 316L or titanium alloy to prevent corrosion.
Welding process: Key welds need to be leak detected by helium mass spectrometry to ensure no leakage.
5、 Energy conservation and environmental protection
Energy Efficiency Ratio (EER)
Compliant with energy efficiency standards, EER ≥ 3.8 (air-cooled type), or using frequency conversion technology to improve energy efficiency.
Support the "free cooling" mode (when the ambient temperature is below the set temperature, natural cooling replaces compressor cooling).
Eco-design
Refrigerant recovery system: facilitates the recovery of refrigerant during maintenance and reduces emissions.
Heat recovery function (optional): Utilizing condensation heat to heat other devices and improve energy efficiency.
6、 Security and Certification
safety standards
Compliant with safety certifications such as GB/T18430, UL, CE, etc.
Equipped with emergency stop button, leakage protection, phase protection and other functions.
reliability test
Before leaving the factory, a continuous 72 hour high load operation test is required, with a failure rate of ≤ 0.5% (annual average).
7、 Customized requirements
Multi loop control: supports independent control of multiple temperature zones (such as the requirements of different modules in laser equipment).
Pressure control: Optional pressure regulating valve to stabilize the outlet pressure (accuracy ± 0.02MPa).
Special medium compatibility: Supports ethylene glycol aqueous solution or deionized water to prevent low-temperature freezing.
Through the above technical requirements, precision chillers can achieve high-precision and high stability temperature control, while also considering energy-saving, safety, and environmental protection needs, meeting the strict requirements of the industrial field for refrigeration equipment.