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.

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저온 냉각기(수냉식 및 공냉식)

온도 제어 범위: -150°C ~ -5°C

당사는 -150°C의 낮은 온도 제어 범위를 갖춘 저온 냉각기 생산을 전문으로 하며, 다양한 산업의 냉장 요구 사항을 충족할 수 있습니다.

재순환 냉각기 (수냉식 및 공냉식)

온도 제어 범위: -120°C ~ +30°C

당사의 재순환 냉각기는 저온 냉동 기술을 채택하고 온도가 -120℃까지 낮으며 다양한 액세서리를 사용자 정의 할 수 있습니다.

실온 냉각기/소형 냉각기

온도 제어 범위: +5°C ~ +50°C

이 냉각기는 다양한 산업 및 실험실에서 널리 사용될 수 있으며 맞춤형 설계를 지원합니다.

직접 냉각식 냉동 장비

온도 제어 범위: -120°C ~ -10°C

열 교환 면적이 작고 열 교환이 큰 장소에 적합합니다.

직접 냉각식 초저온 냉각기

온도 제어 범위: -150°C ~ -110°C

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스크류 칠러

저온 스크류 냉각기 및 실온 스크류 냉각기

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