A compact ultra-low temperature freezer powered by a Stirling engine, engineered to deliver full ULT storage performance in benchtop setups, stacked configurations, and undercounter installations — without requiring large dedicated floor space. With 100 L capacity, full-voltage power supply (110–240 V / 50–60 Hz), energy consumption of just 3 kWh/day at −80°C, 100% natural refrigerant, and PID precision control, the DW-86L100STL sets a new benchmark for energy efficiency, environmental safety, and thermal precision in compact laboratory ULT freezers.

Stirling refrigeration technology replaces the conventional cascade compression system with a linear-motion Stirling engine operating entirely on 100% natural refrigerant — completely eliminating high-GWP HFCs and HFOs. Compared with traditional overlapping compression systems, Stirling technology saves 30% more energy and reduces refrigerant loading by 50%. The engine is compact, highly efficient, and requires no compressor lubricating oil, further reducing mechanical failure points and long-term maintenance costs.

Temperature control is delivered by advanced PID technology, maintaining temperature fluctuation within ±0.5°C across the full set-point range of −20°C to −86°C, with internal temperature uniformity of ≤±2°C throughout the storage volume. The control interface is a 10-inch touchscreen LCD with intelligent human-computer interaction, high-precision display, and multiple alarm functions: high temperature, low temperature, sensor fault, power failure, and integrated audible/visual alarm.

Security is multi-layered: a built-in secret lock, padlock support, optional fingerprint lock, and optional NFC punch lock. The IoT system enables 24-hour remote monitoring of the freezer's operating status via mobile app — with real-time alert configuration. The engine compartment has been repositioned to the top of the cabinet (engine room moved up), lowering the internal storage compartment height for easier sample access. The stackable structure and undercounter design enable versatile installation without additional space or infrastructure. Standard RS485 and USB interfaces complete connectivity and integration options.

Technical Specifications

Key Features

• Stirling refrigeration technology: 30% more energy efficient than traditional overlapping systems

• 100% natural refrigerant — zero fluorinated compounds, zero HFCs, zero high-GWP HFOs

• 50% reduction in refrigerant loading versus conventional systems

• Just 3 kWh/day at −80°C — efficiency reference for compact ULT freezers

• PID control with ±0.5°C fluctuation and ≤±2°C uniformity across −20°C to −86°C

• Wide set-point range: −20°C to −86°C — from moderate freezing to deep ULT storage

• Full-voltage power supply (110–240 V / 50–60 Hz) for global use

• Compact design: benchtop, undercounter, and stackable without space expansion

• 10" touchscreen LCD with intelligent human-computer interaction

• Multi-level security: secret lock + padlock + fingerprint (optional) + NFC (optional)

• 24-hour IoT remote monitoring via mobile app

• Standard USB and RS485 interfaces for data export and system integration

• Quiet operation < 45 dB(A) — suitable for acoustically sensitive lab environments

• CE and UL certified

Applications

The DW-86L100STL is designed for hospitals, disease control centers, research laboratories, biomedical engineering institutes, pharmacies, clinics, and any environment requiring high-precision ULT storage in a limited footprint. It is the ideal choice for researchers who need personal ULT storage close to the bench, without depending on large shared floor-standing freezers — especially relevant in modern laboratories with space constraints, sustainability targets, and IoT traceability requirements.

The 100 L capacity, stackable design, and full-voltage power supply also make the model suitable for clinics and point-of-care environments storing vaccines, reagents, or diagnostic samples requiring temperatures below −40°C, as well as for biobanks seeking modular, scalable storage across multiple compact units.