New refrigeration technology: what has changed, what has remained the same

New refrigeration technology with more power in the low temperature range

Our new CO2 refrigeration technology achieves a test chamber temperature of up to −50°C in our climate chambers and temperature chambers. It is more powerful in the low temperature range than the previous −40°C refrigeration technology. At the critical point of −40°C for many test standards, the new refrigerating units still provide considerable cooling capacity and heat compensation. Traditional, single-stage refrigeration technology can hardly cool test specimens below −30°C.

In all Weiss Technik test chambers, the previous −40°C refrigeration technology is being replaced by new CO2-based refrigeration technology without changing the design, connections, and dimensions of the units. The environmental parameters also remain the same. Infrastructure such as cooling water, connectors, and accessories can continue to be used. Only a few technical parameters have changed.


units with CO2 refrigeration technology

New: Fuses with 300mA required due to frequency converters

The cooling water temperature remains the same: 12-28°C.

Ambient temperatures of up to 35°C are no problem.

The dimensions, size and footprint of all appliances remain the same.

The new Simpac 2.0 controller has a ring buffer, Linux, and NTP.

An electronic cooling water regulator allows a lower water pressure.

The new CO2 refrigeration technology can cool down to -50°C.

Power consumption and power consumption are lower than before.

Lower sound pressure level: CO2 refrigeration has smaller, quieter components.

IEC 60068-2-14 Nb: Sufficient heat compensation in the holding phase at -40°C. No cascade system necessary.

System pressure up to 120 bar, but significantly smaller cross-sections and volumes. No problem with the Pressure Equipment Directive.

CO2 has GWP1 and is not flammable.

Parameterprevious −40°C classnew CO2 refrigeration
Refrigerant GWP13971
Energy consumptionlower
Sound pressure levelquieter
Rate of temperature change, cooling guaranteed up to−18°C−27°C
Temporal temperature deviation0.1–0.5 K0.1–0.5 K
Spatial temperature homogeneity0.5–1 K0.5–1 K
Cooling water temperature12–28°C12–28°C
Ambient temperature28/35°C28/35°C
Footprintidentical
Installation room (practical limit value)2.8 m³ per kg R449A14 m³ per kg CO2
Pressure equipment categoryNoneNone
S!MPATI® portsadditionally 62542 for ASCII 2050 & 2051
Type / Test Space -40°C class (not available from 2025 anymore) CO2 class (available) -70°C class (available)
LabEvent (temperature / climate)      
20 litres   on request --
34 litres 5 K/min -40°C    4 K/min -70°C  5 K/min
64 litres 3 K/min -40°C    3 K/min -70°C  3 K/min
100 litres 5 K/min -50°C    4 K/min -70°C  3 K/min & 10 K/min
150 litres 5 K/min -50°C    4 K/min -70°C  3 K/min & 10 K/min
110/210 litres 3 K/min -50°C    3 K/min -70°C  3 K/min & 5 K/min
500 litres -30°C   3 K/min

-50°C    3 K/min 

(from January 2025 also 6K/min)

-60°C  3 K/min
       
ClimeEvent & TempEvent      
180 litres 3 K/min & 5 K/min 3 K/min  (January 2025: 8K/min) 3 K/min & 5 K/min
340 litres 3 K/min & 5 K/min 3 K/min  (January 2025: 6K/min) 3 K/min & 5 K/min
600 litres 3 K/min & 5 K/min 4 K/min  (January 2025: 9 K/min) 3 K/min & 5 K/min
1000 litres 3 K/min & 5 K/min 10 K/min 3 K/min & 5 K/min
1500 litres 3 K/min & 5 K/min 7 K/min 3 K/min & 5 K/min
2000 litres 3 K/min on request 3 K/min
270 litres 10, 15, 20 K/min 2025 202510, 15, 20, 25 K/min
480 litres 10, 15, 20 K/min 2025 10, 15, 20, 25 K/min
800 litres 10, 15, 20 K/min 2025 10, 15, 20, 25 K/min
1300 litres 10, 15, 20 K/min 2025 10, 15, 20, 25 K/min
       
XXL 1600 litres 3 K/min & 5 K/min -50°C  >4 K/min 3 K/min & 5 K/min
XXL 2450 litres 3 K/min & 5 K/min -50°C  >3 K/min 2 K/min & 4 K/min
XXL 3400 litres 3 K/min & 5 K/min -50°C  >2 K/min 2 K/min & 4 K/min
       
Walk-in (9m³ - 21m³) 2 K/min alle -50°C (>2 K/min) all sizes -70°C (>2K/min)

The performance values are measured according to IEC 60068-3-5 in the range of 10–90% of the entire temperature range.

All our appliances with special functions will also be available with CO2 refrigeration from 2025:

  • ShakeEvent 
  • SunEvent
  • AirEvent Gas & AirEvent Ozone 
  • Constant climate chambers 
  • R-chambers

 

Many rapid coolers (>10 K/min) are available with CO2 and are measured on request.

All models are available on request without F-gas, some with longer delivery times.


Downloads

weisstechnik-FAQ-Refrigerants-0324.pdf

Refrigerants I F-gas Regulation Overview

FAQ

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Factsheet-Refrigerant-CO2-EN.pdf

New weisstechnik CO₂ refrigeration technology with GWP 1

Factsheet

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