Free-Piston Stirling Engine Technology

Ultra-Low Temperature Storage.
Anywhere You Need It.

Portable −86 °C freezers engineered around a helium-charged free-piston Stirling engine. Run on 100–240 V AC or 24 V DC — in the laboratory, inside a vehicle, or at the point of care.

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−86 °C

Ultra-Low Setpoint

13–45 L

Three Capacities

AC / 24 V DC

Dual Power Input

Sino Stirling DW-86W25L portable ultra-low temperature freezer, 25 litre capacity, three-quarter view

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Why Sino Stirling

Cold chain hardware built for the field, not just the lab

Conventional compressor freezers are heavy, vibration-prone and tied to mains power. Our Stirling-driven portable freezers deliver true −86 °C storage in a carryable footprint — with no dry ice, no liquid nitrogen and no compromise on temperature stability.

Stirling Core

Helium-charged free-piston Stirling engine with continuous modulation — no compressor oil, minimal vibration, long service life.

−86 °C Stability

Adjustable −86 °C to −20 °C in 1 °C steps, ±3 °C uniformity top to bottom, microprocessor controlled with high/low alarms.

Power Anywhere

100–240 V AC at 50/60 Hz, or 24 V DC from a vehicle or mobile source. True auto-voltage for worldwide deployment.

Natural Refrigerant

R-170 (ethane) with helium — 100 % natural, low-GWP refrigerants. No special export classification; ship by air, road or sea.

Product Range

Three capacities. One technology platform.

Every model shares the same Stirling engine, control system and insulation architecture — choose the volume that fits your workflow.

DW-86W13L

13 L · 0.46 cu.ft.

Capacity 10 × 2″ boxes
Temperature −86 to −20 °C
Max power 120 W
Net weight 15 kg
Pull-down 3 h to −80 °C

View Details Datasheet

DW-86W25L

25 L · 0.9 cu.ft.

Capacity 20 × 2″ boxes
Temperature −86 to −20 °C
Max power 120 W
Net weight 21 kg
Pull-down 4 h to −80 °C

View Details Datasheet

DW-86W45L

45 L · 1.5 cu.ft.

Capacity 32 × 2″ boxes
Temperature −86 to −20 °C
Max power 280 W
Net weight 27 kg
Pull-down 4 h to −80 °C

View Details Datasheet

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Watch

Sino Stirling in motion

A short look at who we are and how our portable −86 °C freezers work — from the workshop to the field. Click to play.

Company & Product Intro Sino Stirling portable ultra-low temperature freezer — company and product introduction

Running time ≈ 1 min 16 s · 720p · with sound — best with headphones or speakers.

The Technology

A cooling engine with almost nothing to wear out

Inside every unit is a helium-charged free-piston Stirling engine. Heat is moved by a gravity-driven thermosiphon to a finned heat exchanger, while the cold wall liner freezes the chamber evenly.

Free-piston Stirling engine with continuous modulation — no compressor, no oil, no refrigerant pump
Gravity-driven thermosiphon heat transport — no moving parts in the cold loop
R-170 (ethane) natural refrigerant, 10–12 g charge only
Vacuum insulated panels + polyurethane foam for maximum hold time
Under 55 dB(A) at 1 metre — quiet enough for clinical and laboratory environments
Optional wireless temperature monitoring, logging and dry-contact alarm output

How Stirling Cooling Works

Cutaway view showing the internal layout of the portable ultra-low temperature freezer, including the Stirling cooling engine, thermosiphon and cold wall liner

Applications

Trusted wherever temperature is critical

From regenerative medicine to remote field sampling — if it must stay at −80 °C, it can travel with you.

Biologics & Cell Therapy

Long-term storage and transport of cell therapies, regenerative medicine products and sensitive biologics.

Vaccines & Pharmaceuticals

Keep vaccines, reagents and APIs within specification without relying on dry ice replenishment.

Clinical Point-of-Care

Deliver temperature-sensitive therapies to the patient side, in clinics and remote treatment sites.

Field & Remote Sampling

Collect specimens far from infrastructure on 24 V DC vehicle power — no dry ice, no confined-space CO₂ risk.

Laboratory Benchtop

A compact −86 °C unit beside the bench — frees up upright freezer space and shortens sample handling.

Material Low-Temp Testing

Simulate ultra-cold environments for component, electronic and material performance validation.

Insights & Application Notes

From the field & the lab

Practical guides on ultra-low temperature storage, Stirling engine technology and picking the right −86 °C freezer for your scenario.

Cold Chain

Made to order

Need a configuration that isn’t in the catalogue?

We build to your specification — branded housings, custom voltage and plug sets, extended temperature ranges, racking and basket layouts, monitoring integration and OEM / private-label programmes.

Custom & OEM Service Talk to an engineer

Ultra-Low Temperature Storage.
Anywhere You Need It.