Cascade Refrigeration System to Reduce Low-Temperature Compressor Load

The refrigeration system is divided into three independent temperature zones (high-temperature-side, medium-temperature-side, and low-temperature-side refrigerators), each with its own compressor and refrigeration circuit. This segmentation allows each compressor to operate within its optimal temperature range, eliminating the need for special cold-tolerant structures in low-temperature compressors while achieving stable cooling to extremely low temperatures.

The medium-temperature-side refrigerator acts as an intermediary between the high-temperature-side and low-temperature-side refrigerators. The medium-temperature-side evaporator serves as a heat exchanger that cools the low-temperature-side condenser, enabling the low-temperature-side compressor to operate at higher temperatures without direct exposure to extreme cold, thus reducing structural complexity requirements.

By segmenting the refrigeration system into three independent temperature zones with separate compressors, each compressor can use standard, off-the-shelf components designed for their specific operating ranges. This eliminates the need for expensive custom-manufactured cold-tolerant compressors, significantly reducing manufacturing costs while maintaining cooling stability.

The system uses standard, commercially available compressors for each temperature zone rather than investing in expensive, specialized cold-tolerant compressors. This approach prioritizes cost-effectiveness by using readily available components that can be easily replaced if needed, rather than relying on expensive custom-built equipment.

The three-compressor architecture allows each compressor to be selected from standard inventory items appropriate for its temperature range. Since standard compressors are readily available and do not require special cold-tolerant modifications, the construction period is significantly reduced compared to waiting for custom-manufactured low-temperature compressors.

By using standard, commercially available compressors rather than specialized equipment, the system leverages existing supply chains and inventory availability. This approach eliminates delays associated with custom manufacturing and ensures that all compressor components can be procured quickly from standard suppliers, accelerating the construction timeline.