Views: 1 Author: Sanwood Technology Publish Time: 2025-11-10 Origin: Sanwood Technology
Within the field of environmental simulation testing, energy consumption during prolonged low-temperature represents a major ‘hidden cost’ for many enterprises. Conventional refrigeration systems rely on on-off control to regulate temperature through compressor start-stop cycles, resulting in low energy efficiency, large temperature fluctuations, and accelerated system wear. Sanwood Technology's VRF technology, developed based on the PID cold-end output principle, offers an effective energy-saving solution for low-temperature environmental testing.
I. Technical Challenges
Limitations of conventional refrigeration systems in low-temperature ranges:
Severe energy waste: On-off control leads to frequent compressor start-up surges and often requires simultaneous heating to balance excess cooling, causing significant ‘cooling-heating’ energy consumption.
Poor temperature stability: Stepwise output changes create unstable refrigerant flow and pressure, directly impacting temperature uniformity and control accuracy within the test zones.
Accelerated system degradation: Frequent compressor start-stop cycles, akin to mechanical ‘hard braking and sudden acceleration’, substantially increase component wear, elevating failure rates and maintenance costs.
II. VRF Technology
The core of Sanwood Technology's VRF technology lies in achieving real-time, precise matching of cooling output to actual thermal loads. Its operational workflow constitutes a sophisticated closed-loop control system:
Precise sensing: High-precision sensors continuously detect even minute deviations between chamber temperature and setpoints.
Intelligent Control: A built-in PID controller analyzes the deviations, calculates the precise required cooling capacity, and outputs continuous refrigerant flow control signals.
Precision Execution: Based on PID calculations, it drives electronic expansion valves or quick-opening solenoid valves for stepless regulation, enabling linear, continuous control of refrigerant flow to eliminate energy wastage at its source.
III. Tangible Benefits
This technology delivers directly quantifiable value to customers:
Significant Energy Savings: By precisely matching refrigeration capacity, it prevents energy counteraction and high-power idling of compressors. Compared to conventional equipment, energy consumption is reduced by 30%, directly cutting operational costs.
Ensured Test Accuracy: Smooth flow control guarantees ultimate stability in heat exchange processes, providing core support for achieving uniformity in fluctuation and temperature distribution, ensuring precise and reliable test data.
Enhanced System Reliability: ‘Flexible’ control prevents compressor start-stop impacts. Combined with a modular refrigeration system design, this ensures smoother operating pressures, effectively extending equipment lifespan.
IV. Applicable Equipment
Rapid Temperature Change Test Chamber
Temperature Range: -70℃ to +180℃
Temperature Fluctuation: ≤±0.5℃ (under no-load, steady-state conditions)
Heating Rate: -55℃ to +155℃ (Linear or Non-linear: 5℃, 10℃, 15℃, 20℃, 25℃/min)
Cooling Rate: +155℃ to -55℃ (Linear or Non-linear: 5℃, 10℃, 15℃, 20℃, 25℃/min)
Shock temperature range: -65℃ to +150℃
Temperature shock recovery time: ≤5 minutes under no-load conditions
Temperature deviation: ≤+2℃ (tested at steady state)
Basket transfer time: ≤10 seconds
Walk-in Environmental Test Chamber
Temperature range: -70℃ to +150℃ (continuously adjustable)
Humidity range: 20%RH to 98%RH
Temperature fluctuation: ≤±0.5℃ (unloaded)
Heating rate: -65℃ to +85℃, average ≥3℃/min throughout (unloaded)
Cooling rate: +85℃ to -65℃, average ≥1℃/min throughout (unloaded)
V. Conclusion
Sanwood Technology's VRF technology is built around the principle of precise refrigerant control. It consistently reduces operational costs for clients while robustly safeguarding the reliability and accuracy of extreme environment testing. This technology is now extensively adopted across multiple critical sectors including low-altitude economy, energy storage, electronic semiconductors, defence weaponry, and new energy vehicles.
For tailored testing solutions, please contact Sanwood Technology. We will provide customized, professional services to meet your specific requirements.
