Cascade Refrigeration System

Cascade Refrigeration System

In the industrial refrigeration cycle system, low temperature can be obtained by adopting two-stage or multi-stage compression refrigeration cycle, which solves the problem of excessive pressure ratio. If the two-stage or multi-stage vapor compression refrigeration cycle cannot meet this requirement, we need to use the cascade refrigeration system. There are three main reasons why cascade refrigeration system must be adopted.

1. The result characteristics of piston compressor valves are limited: low evaporation pressure affects the automatic switching characteristics of reciprocating piston compressor valves, which deviates from the design range. When the suction pressure is 10~16kPa, the suction valve of the compressor does not open, and the compressor cannot suck. On the other hand, the compressor and the low-pressure part of the system operate under high vacuum, and the possibility of intrusion of non-condensable gas becomes high.

2. Limitation of refrigeration cycle pressure ratio: Once the necessary evaporation pressure is too low, even if the two-stage compression refrigeration cycle is used, the pressure ratio of each stage still exceeds the specified value, which greatly reduces the efficiency of the refrigeration cycle. In addition, with multi-stage compression, the cycle pressure is guaranteed, but the refrigeration system is complex and the technical and economic indicators are not high.

3. Restricted by the freezing point of the refrigerant: when the evaporation temperature required by the refrigeration cycle system of the chiller is lower than the freezing point of the refrigerant, the refrigerant freezes and cannot flow, and the system cannot circulate. For example, because the freezing point of R17 is -77.7°C, it is obviously not suitable for the refrigeration cycle system whose evaporation temperature is below -77.7°C.

Based on the above three points, it is unfavorable or impossible to use a single refrigerant multi-stage compression refrigeration cycle chiller to obtain a lower temperature. Although the evaporation temperature of the multi-stage compression refrigeration cycle is lower than that of the single-stage compression refrigeration cycle, it is limited by the physical properties of the refrigerant itself and the working characteristics of the compressor. When the evaporation temperature is lower, the multi-stage compression refrigeration cycle is used. Often can not meet the requirements, at this time, need to use cascade refrigeration system.

Maßgeschneiderte Lösungen für Ihr Unternehmen

Low Temperature Chillers (Water Cooled & Air Cooled)

Temperaturregelbereich: -150°C bis -5°C

Wir haben uns auf die Herstellung von Niedertemperaturkältemaschinen mit einem Temperaturregelbereich von bis zu -150°C spezialisiert, die den Kühlbedarf verschiedener Branchen decken.

Rückkühler (Water Cooled & Air Cooled)

Temperature Control Range: -120°C to +30°C

Unser Rückkühler arbeitet mit Niedertemperatur-Kältetechnik, die Temperatur beträgt bis zu -120℃, und verschiedene Zubehörteile sind anpassbar.

Raumtemperatur-Kühlgeräte / Kleinkühlgeräte

Temperaturregelbereich: +5°C bis +50°C

Die Kältemaschine kann in verschiedenen Industrien und Labors eingesetzt werden und unterstützt kundenspezifische Designs.

Kühlgeräte mit direkter Kühlung

Temperature Control Range: -120°C to -10°C

Er eignet sich für Orte mit kleiner Wärmeaustauschfläche und großem Wärmeaustausch.

Direktkühlende Ultra-Niedrigtemperatur-Kühlgeräte

Temperature Control Range: -150°C to -110°C

Customized solutions for your business.

Schraubenkühler

Niedertemperatur-Schraubenkühlmaschinen und Raumtemperatur-Schraubenkühlmaschinen

Customized solutions for your business.