Vema Sustainable Solutions

We use air because we care about the planet
Our partner – Mirai Intex
Save the planet with us

Our activities

  • Blood Plasma Freezing (-50-60 °C)
  • Semiconductor – etching (-70-90 °C)
  • Plastic Grinding (-60-70°C)
  • Fish Freezing (-20-40 °C)
  • Metal Hardening (-80-100 °C)
  • Solvent Recovery (-70 -90 °C)
  • Testing chambers/processes (-40 – 70°C)
  • Cryotherapy (-110-120 °C)
  • Pharmeceutical Lyophilisation (-70-90 °C)
  • Pharmeceutical Storage (-60-80 °C)
  • Logistic Transport (-60-80 °C)
  • Food Storage (-50-70 °C)
  • Food Lyophilisation (-30-45 °C)
  • LNG Production (-100-120 °C)

Cold Distribution and Humidity extraction


Airduct is necessary unity which guarantee right distribution of cold to the chamber. It should goes from the machine to the most remote part of the chamber to uniform distribution of cold in chamber.

Snow catcher

Snow catcher is a device aimed to remove humidity out from the chamber. Necessary for minimize risk of icing of floor and samples.

Control System

Temperature sensors

As a part of monitoring system should be in each corner of chamber. For control of temperature uniformity of chambers parts.


Addition to the sensors and part of monitoring system. Allow to control inside space of chamber without extra entrance. Notes: should be protected from icing and breakdown because of ULT.

Access control and Safety

Access control system

To limit the number of persons who have access to the storage space.


Door should be isolated, icing protected. Locking mechanism must be chosen to satisfy need of pressure difference.

ULT Refrigeration Systems comparison

Future Proof Reliability Safety
Machinery Room
Maintenance Part Load Lifecycle Cost
Air Cycle Air as refrigerant
Free refrigerant
GWP = 0
Air-bearing compressor
No contacting pairs (no wear)
Low system pressure (from 1 to 10 bar)
No need for separate machine room
Only electrical cabinet filter cartridge exchange Frequency inverter included
RPM of compresso controlled amtomatically
Almost no maintenance required
No refrigerant and refills
Vapor Compression Synthetic refrigerants bans
Natural refrigerants restricted by safety regulations
Compressor wear
Damage by liquid refrigerant
Damage due to insufficient lubrication
ATEX directive for respective refrigerants
Gas sensors ventilation
Vibration damping floor
Oil and refrigerant management
Safety valves check
Regular leakage check
Trained staff necessary
Depending on system design
Usually start/stop or hot gas bypass
Requires many components
Increasing price of refrigerants
Intensive costly maintenance
Liquid Nitrogen Transport regulations
Storage regulations
No moving parts
High thermal stress
Gas sensors, ventilation
Space for LN2 storage
LN2 refills
Valve function check
Safety valves check
Dosage based High long-term running costs
LN2 to be transported and stored on site

MIRAI Cold Benefits